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Description  |
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BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electronic endoscope apparatus whereby a
plurality of images can be formed and, for example, an imaged object can
be three-dimensionally observed.
2. Related Art Statement
Recently, there is extensively utilized an endoscope whereby organs within
a body cavity can be observed by inserting an elongated insertable part
into the body cavity or, as required, various curing treatments can be
made by using a treating tool inserted through a treating tool channel.
Also, there are suggested various electronic endoscopes wherein such solid
state imaging device's as a charge coupled device (CCD) is used for the
imaging means.
Now, as in finding an initial cancer, in some case, it is important to
discriminate fine concavo-convexes on the surface. However, with the
conventional endoscope, the observed or displayed image is plane and it
has been difficult to discriminate fine concavo-convexes. Therefore, if
the swelling state is so little as to be, for example, of the initial
affected state, the affected state will be overlooked and it will be
difficult to make a proper diagnosis.
Also, there are defects that, in the case of making a curing treatment by
using a treating tool or the like, it will be difficult to positively
catch the distance sense and the treatment will be a trouble.
By the way, an endoscope whereby a three-dimensional viewing is possible by
using an image guide fiber bundle is mentioned in the gazette of a
Japanese utility model publication No. 25360/1973. In this related art
example, a pair of image guide fiber bundles for the right eye and left
eye are required and there is a problem that the diameter becomes large
over the entire length of the insertable part.
Also, in the gazette of a Japanese patent application laid open No.
80221/1986, there is disclosed a technique whereby a three-dimensional
viewable image is obtained by a pair of image inverting prisms and a pair
of electronic shutters and can be three-dimensionally viewed by spectacled
switched and controlled as synchronized with the electronic shutter.
However, in this related art example, the light path to the imaging device
becomes so long that, if the optical system and imaging device are
arranged in the tip part of the insertable part of the actual endoscope,
the imaging part for obtaining a three-dimensional picture image will
become too long. This imaging part can not be made bendable and therefore
there is a defect that the rigid tip part becomes so long that a great
pain will be forced to the patient in the case of inserting it.
There are also defects that, in case two independent solid state imaging
devices are provided in the tip part of the insertable part, the outside
diameter of the tip part will become large, will also force a great pair
to the patient in the case of inserting it and the case of being able to
use it will be restricted.
OBJECT AND SUMMARY OF THE INVENTION
An object of the present invention is to provide an electronic endoscope
whereby a plurality of object images can be imaged without enlarging the
diameter of the insertable part and the diameter and length of the rigid
tip part of the insertable part.
Another object of the present invention is to provide an electronic
endoscope apparatus whereby a three-dimensional observation is possible
without enlarging the diameter of the insertable part and the diameter and
length of the rigid tip part of the insertable part.
A further object of the present invention is to provide an electronic
endoscope apparatus whereby a plurality of images can be obtained with one
solid state imaging device and a three-dimensional observation is
possible.
An electronic endoscope apparatus adapted to the three-dimensional
observation of the present invention comprises an elongate insertable
part, two image forming optical systems provided in the tip part of the
above mentioned insertable part and an integrated imaging means provided
in the tip part of the above mentioned insertable and having two imaging
regions in which object images are formed by the above mentioned two image
forming optical system. In one mode of the present invention, the above
mentiond imaging means has a solid state imaging device having two imaging
regions. In another mode of the present invention, the above mentioned
imaging means has two integrated solid state imaging device. The above
mentioned two image forming optical systems are arranged in two positions
where the three-dimensional viewing is possible.
The other features and advantages of the present invention will become
apparent enough with the following explanation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 to 3 relate to the first embodiment of the present invention.
FIG. 1 is a block diagram showing the formation of an electronic endoscope
apparatus.
FIGS. 2(A) and 2(B) are explanatory views showing the image forming regions
of a solid state imaging device.
FIG. 3 is a side view showing the entire electronic endoscope apparatus.
FIG. 4 is an explanatory view showing a displaying apparatus relating to a
modification of the first embodiment.
FIGS. 5 and 6 relate to the second embodiment of the present invention.
FIG. 5 is a block diagram showing the formation of an electronic endoscope
apparatus.
FIG. 6(A) is a timing chart showing an input signal of a monitor.
FIG. 6(B) is a timing chart showing a displayed picture image of a monitor.
FIG. 6(C) is a timing chart showing the operation of a right eye shutter.
FIG. 6(D) is a timing chart showing the operation of a left eye shutter.
FIG. 7 is a flow chart showing the operation of a visual field converting
apparatus.
FIGS. 8 and 9 relate to the third embodiment of the present invention.
FIG. 8 is a block diagram showing the formation of an electronic endoscope
apparatus.
FIG. 9(A) is a timing chart showing input signals of an A/D converter and
synchronous separating circuit.
FIG. 9(B) is a timing chart showing displayed picture images of a monitor.
FIG. 9(C) is a timing chart showing the operation of a switch 112.
FIG. 9(D) is a timing chart showing the operation of a switch 115.
FIG. 9(E) is a timing chart showing the operation of a right eye shutter.
FIG. 9(F) is a timing chart showing the operation of the left eye shutter.
FIGS. 10 to 14 relate to the fourth embodiment of the present invention.
FIG. 10 is an explanatory view showing the tip part of the insertable part.
FIG. 11 is a block diagram showing the formation of an electronic endoscope
apparatus.
FIG. 12 is an elevation of the tip part of the insertable part.
FIG. 13 is a perspective view showing two solid state imaging device and
package.
FIG. 14 is an explanatory view showing a connector of the endoscope.
FIG. 15 is an elevation of the tip part of the insertable part in the fifth
embodiment of the present invention.
FIG. 16 is an elevation of the tip part of the insertable part in the sixth
embodiment of the present invention.
FIG. 17 is an elevation of the tip part of the insertable part in the
seventh embodiment of the present invention.
FIGS. 18 and 19 relate to the eighth embodiment of the present invention.
FIG. 18 is an explanatory view showing the tip part of the insertable part.
FIG. 19 is a block diagram showing a part of a video processor.
FIGS. 20 and 21 relate to the ninth embodiment of the present invention.
FIG. 20 is an explanatory view showing the tip part of the insertable part.
FIG. 21 is an arrangement explaining view of the tip part of the insertable
part as seen from the front.
FIG. 22 is an explanatory view showing the tip part of the insertable part
in the tenth embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 to 3 show the first embodiment of the present invention.
As shown in FIG. 3, an electronic endoscope 1 is provided with an elongate,
for example, flexible insertable part 2 to the rear end of which a thick
operating part 3 is connected. A flexible universal cord 4 is extended
sidewise from the rear end part of the above mentioned operating part 3
and is provided with a connector 5 in the tip part. On the other hand, a
control apparatus 6 containing a light source apparatus and signal
processing circuit is provided with a connector receptacle 8 connectable
with the above mentioned connector 5. The above mentioned electronic
endoscope 1 is to be connected with the above mentioned control apparatus
6 by connecting the above mentioned connector 5 to the above mentioned
connector receptacle 8. Further, a color monitor 7 as a displaying means
is to be connected to the above mentioned control apparatus 6.
A rigid tip part 9 and a curvable part 10 adjacent to this tip part 9 and
curvable to the rear side are provided in turn on the tip side of the
above mentioned insertable part 2. The above mentioned curvable part 10
can be curved horizontally and vertically by rotating and operating the
curving operation knob 11 provided in the above mentioned operating part
3.
In this embodiment, as shown in FIG. 1, a pair of objective lens systems 15
and 16 are arranged in parallel or as inclined inward in two positions
where the tip side of the above mentioned tip part 9 can be
three-dimensionally seen. One solid state imaging device 17 is arranged in
the image forming positions of these objective lens systems 15 and 16. A
filter array in which color filters transmitting respectively three
primary colors, for example of red (R), green (G) and blue (B) are
arranged in the form of a mosaic or the like is secured, though not
illustrated, on the front surface of the imaging surface of this solid
state imaging device 17.
As shown in FIGS. 1 and 2(A) and (B), the above mentioned solid state
imaging device 17 has a long rectangular imaging surface 18 in the
arranging direction of the above mentioned pair of the objective lens
systems 15 and 16. Two image forming regions 21 and 22 in which object
images are formed by the above mentioned pair of the objective lens
systems 15 and 16 are provided on this imaging surface 18. These two image
forming regions 21 and 22 may be provided without overlapping with each
other as shown in FIG. 2(A) or as partly overlapped as shown in FIG. 2(B).
A driving pulse signal line 31 and signal output signal line 32 are
connected to the above mentioned solid state imaging device 17, are
inserted through the above mentioned insertable part 2 and universal cord
4 and are connected to the above mentioned connector 5. When the above
mentioned connector 5 is connected to the connector receptacle 8 of the
control apparatus 6, the above mentioned driving pulse signal line 31 will
be connected to a driver 34 within the control apparatus 6 and the signal
output signal line 32 will be connected to a pre-amplifier 33. By the way,
this pre-amplifier 33 may be provided on the electronic endoscope 1 side.
A light distributing lens system 41 is arranged on the tip side of the
above mentioned tip part 9. A light guide 42 formed of a flexible fiber
bundle is provided in the rear of this light distributing lens system 41,
is inserted through the above mentioned insertable part 2 and universal
cord 4 and is connected to the above mentioned connector 5.
On the other hand, a light source apparatus 43 is provided within said
control apparatus 6 and is provided with a lamp 44. The light emitted from
this lamp 44 has infrared rays cut by an infrared ray cutting filter 45,
is condensed by a condenser lens 46, further passes through a diaphragm 48
controlled by an iris controlling circuit 47 and enters the entrance end
of the light guide 42 of the connector 5 connected to the connector
receptacle 8 of the control apparatus 6. The illuminating light having
entered this light guide 42 is led to the tip part 9 by this light guide
42, is emitted from the exist end and is radiated onto an object through
the light distributing lens 41.
The reflected image of the object by this illuminating light passes through
the objective lens systems 15 and 16 and is formed respectively in the
image forming regions 21 and 22 of the solid state imaging device 17. The
signal charge accumulated in this solid state imaging device 17 is
transferred to a vertical transferring path if in an interline
transferring system or to an accumulating part if in a frame transferring
system according to the driving pulse .PHI.V output from the above
mentioned driver 34 and is read out sequentially. The output signal read
out of this solid state imaging device 17 is input into the above
mentioned pre-amplifier 33 through the signal line 32. By the way, a
vertical synchronous signal VP output from a synchronous signal generator
50 is input into the above mentioned driver 34 through an isolating
process 59 isolating the part entering the patient body and the signal
processing part from each other to protect the patient from
electrification and the rise of the above mentioned driving pulse .phi.V
and the above mentioned vertical synchronous signal VP are made to
coincide with each other.
The output signal of the solid state imaging device 17 amplified by the
above mentioned pre-amplifier 33 is processed as follows. That is to say,
an isolating process 51 isolating the part entering the patient body and
this signal processing part from each other in order to protect the
patient from electrification and a reset noise removing process 52 for
reducing the 1/f noise and reset noise generated mostly in the solid state
imaging device 17 are made and then unnecessary components are removed by
a low-pass filter 53. Further, the signal is adjusted in the white balance
by the white balance adjusting circuit 54 and is then .gamma.-corrected by
a .gamma.-correcting circuit 55. The electric signal-light converting
characteristic of the cathode-ray tube is not linear but .gamma.=2.2. This
.gamma.-correcting circuit 55 is to be provided to correct this
non-linearity to be linear as a whole through the electronic endoscope 1
and the reciprocal number .gamma.=0.45 of .gamma.=2.2 is general. The
output of this .gamma.-correcting circuit 55 is input into the process
circuit 56. For example, a luminance signal and color difference signals
are produced by this process circuit 56. Further, a video signal, for
example, of the NTSC system is produced by an encoder 57 from the output
of the above mentioned process circuit 56 and is input into the color
monitor 7 to color-display the object.
By the way, the above mentioned synchronous signal generator 50 applies a
synchronous signal to the above mentioned encoder 57 to process the signal
to be synchronized with the driving pulse .PHI.V used to read out the
signal of the solid state imaging device 17.
The output of the above mentioned white balance adjusting circuit 54 is
input also into the iris controlling circuit 47 to control the diaphram 48
by the size of the voltage level integrating the output signal of the
above mentioned white balance adjusting circuit 54.
The object image of the visual field of the objective lens system 15 formed
in the image forming region 21 and the object image of the visual field of
the objective lens system 16 formed in the image forming region 22 in the
solid state imaging device 17 are simultaneously displayed on the right
and left and are somewhat displaced from each other by the parallax
between both eyes.
In this embodiment, a polarizing plate 61 passing only the lights in the
polarizing directions different from each other in the left side part 61L
and right side part 65R is fitted to the front surface of the above
mentioned color monitor 7. By observing the video image of this color
monitor 37 through polarizing spectacles 62 having the left part 62L
passing only the light in the same polarizing direction as of the left
side part 61L of the above mentioned polarizing plate 61 corresponding to
the left eye and a right part 62R passing only the light in the same
polarizing direction as of the right side part 61R of the above mentioned
polarizing plate, the object image of the visual field of the objective
lens system 15 will be observed by the left eye and the object image of
the visual field of the objective lens system 16 will be observed by the
right eye. Therefore, by the difference of the visual fields of both
objective lens systems 15 and 16, a three-dimensional image of the object
will be observed.
In this embodiment formed as in the above, the object images of the visual
fields of a pair of objective lens systems 15 and 16 arranged in two
positions where a three-dimensional viewing is possible are formed
respectively in the two image forming regions 21 and 22 on the imaging
surface 18 of one solid state imaging device 17. The output signal of this
solid state imaging device 17 is processed to be a video signal by a
signal processing circuit within the control apparatus 6 and the video
signal is input into the color monitor 7. The object image of the visual
field of the objective lens system 15 formed in the image forming region
21 and the object image of the visual field of the objective lens system
16 formed in the image forming region 22 in the above mentioned solid
state imaging device 17 are simultaneously displayed on the right and
left. By observing the video image of this color monitor 7 through the
polarizing plate 61 and polarizing spectacles 62, a three-dimensional or
stereo-image of the object can be observed.
Thus, according to this embodiment, as a three-dimensional or stereo-image
of an object can be observed, minute concavo-convexes on the object
surface can be discriminated and an initial cancer or the like can be
easily found.
Also, according to this embodiment, it is not necessary to insert a pair of
image guides through the insertable part 2 and therefore the diameter of
the insertable part 2 does not become large.
Further, the object images of the visual fields of the pair of the
objective lens systems 15 and 16 formed simultaneously on the imaging
surface 18 of one solid state imaging device 17 are simultaneously imaged
and displayed in a color monitor 7 at a real time.
As the object images of the visual fields of the pair of the objective lens
systems 15 and 16 can be imaged, as compared with the case of providing
two independent solid state imaging devices, the formation is simpler and
the diameter of the tip part 9 can be reduced.
By the way, in this embodiment, in the course of the signal processing
circuit, for example, after the encoder 57, a visual field converting
apparatus is provided so that the visual field may be converted and a
better three-dimensional or stereo-sense may be obtained.
FIG. 4 is an explanatory view showing a displaying apparatus related to a
modification of the first embodiment.
In this modification, the color monitor 7 is contained within a housing 71
having an opening 72 on the displaying surface 7a side. An adapter member
73 is fitted removably to the opening 72 of this housing 71 by an engaging
means 74. This adapter member 73 is provided with a hood part 76 covering
the displaying surface 7a side of the above mentioned color monitor 7 and
a partition plate 77 dividing the interior of this hood part 76 into the
right and left of the displaying surface 7a of the above mentioned color
monitor 7. In the above mentioned hood part 76, observing windows 78a and
78b are provided at a spacing corresponding to both right and left eyes on
the right and left by holding the above mentioned partition plate 77 in
the part opposed to the displaying surface 7a of the above mentioned color
monitor 7 and are fitted respectively with lenses 79a and 79b. When the
displaying surface 7a of the above mentioned color monitor 7 is observed
through the above mentioned lenses 79a and 79b with both right and left
eyes, the left eye will be able to observe only the left side part of the
above mentioned displaying surface 7a and the right eye will be able to
observe only the right side part of the above mentioned displaying surface
7a.
In the above mentioned color monitor 7, the same as in the first
embodiment, the object image of the visual field of the objective lens
system 15 formed in the image forming region 21 and the object image of
the visual field of the objective lens system 16 formed in the image
forming region 22 in the solid state imaging device 17 are displayed
simultaneously on the right and left. Therefore, when the video image of
this color monitor 7 is observed from the observing windows 78a and 78b of
the above mentioned adapter member 73, a three-dimensional or stereo-image
of the object will be able to be observed.
FIGS. 5 and 6 show the second embodiment of the present invention.
In this embodiment, the output signal of the .gamma.-correcting circuit 55
is converted to a digital signal by an A/D converter 81 and is memorized
in a memory 82. In this memory 82, two read-out addresses can be
designated by tow read-out address generators 83L and 83% switched and
connected through a switching switch 84. One read-out address generator
83L generates an address reading out the left half of a picture image
memorized in the above mentioned memory 82, that is, the object image of
the visual field of the objective lens system 15 formed in the image
forming region 21 of the solid state imaging device 17. The other read-out
address generator 83R generates an address reading out the right half of a
picture image memorized in the above mentioned memory 82, that is, the
object image of the visual field of the objective lens system 16 formed in
the image forming region 22 of the solid state imaging device 17.
In this embodiment, in the above mentioned solid state imaging device 17,
in each field, the object image of the visual field of the objective lens
system 15 and the object image of the visual field of the objective lens
system 16 are simultaneously imaged. Both of these object images are
memorized in the above mentioned memory 82. The above mentioned switching
switch 84 is switched for each field by the switching controlling signal
produced by a switching controlling circuit 85 on the basis of a vertical
synchronous signal VP from a synchronous signal generator 50. Therefore,
in the above mentioned memory 82, the left half of the memorized picture
image, that is, the object image of the visual field of the objective lens
system 15 formed in the image forming region 21 of the solid state imaging
device 17 and the right half of the memorized picture image, that is, the
object image of the visual field of the objective lens system 16 formed in
the image forming region 22 of the solid state imaging device 17 are
alternately read out in each field.
The signal read out of the above mentioned memory 82 is memorized
alternately in the memory 87L and memory 87R through a switching switch
86. Further, the above mentioned memories 87L and 87R are controlled by
the above mentioned switching controlling circuit 85, the signal written
in is read out alternately in each field, is input into a D/A converter 89
through a switching switch 88 switches as synchronized with the above
mentioned switching switches 84 and 86 by the switching controlling signal
produced by the above mentioned switching controlling circuit 85, is
converted to an analogue signal by this D/A converter 89 and is input into
the process circuit 56 and, for example, a luminance signal and color
difference signals are produced by this process circuit 56. Further, a
video signal, for example, of an NTSC system is produced by the encoder 57
from the output of the above mentioned process circuit 56, is input into
the color monitor 7 to color-display the object.
In the above mentioned color monitor 7, as shown in FIG. 6 (A), in each
field (1/60 second), the video signal of the image memorized in the memory
87R and the video signal of the image memorized in the memory 87L are
input alternately and therefore, in this color monitor 7, as shown in FIG.
6 (B), the object image of the visual field of the objective lens system
16 and the object image of the visual field of the objective lens system
15 are displayed alternately in each field. By the way, the period of the
display of one image is 1/30 second. In FIG. 6, the symbol R represents
the object image of the visual field of the objective lens system 16, L
represents the object image of the visual field of the objective lens
system 15 and the attached numeral represents the frame number.
In this embodiment, by observing the video image of the above mentioned
color monitor 7 through a shutter 91, a three-dimensional or stereo-image
of the object can be observed. The above mentioned shutter 91 is formed of
a right eye shutter 91R corresponding to the right eye and a left eye
shutter 91L corresponding to the left eye. Both shutters 91R and 91L
alternately intercept the light in each field as shown in FIGS. 6 (C) and
(D) by a switching controlling circuit 85. By observing the video image of
the above mentioned color monitor through this shutter 91, for example,
the object image of the visual field of the objective lens system 15 is
observed with the left eye and the object image of the visual field of the
objective lens system 16 is observed with the right eye. Therefore, a
three-dimensional or stereo-image of the object is observed by the
difference between the visual fields of both objective lens systems 15 and
16. By the way, one eye observes the video image for 1/60 second every
1/30 second. By the way, in FIG. 6, the open state of the shutter 91R and
91L is represented by ON and the closed state is represented by OFF.
The above mentioned shutter 91 may be an electronic optical shutter formed,
for example, of a PLZT or liquid crystal.
The other formations are the same as in the first embodiment.
According to this embodiment, the image corresponding to the right eye and
the image corresponding to the left eye can be separated from each other.
The respective images can be independently recorded and stopped.
By the way, in this embodiment, the D/A converter, process circuit and
encoder may be provided respectively in the rear steps of the memorys 87R
and 87L and the right and left images may be displayed in respectively
separate monitors. The video images of the respective monitors may be
observed with the right and left eyes by using such means as the
polarizing plate, polarizing spectacles and adapter member shown in the
first embodiment.
The other operations and effects are the same as in the first embodiment.
In this embodiment, too, in the course of the signal processing circuit or,
for example, after the encoder 57, a visual field converting apparatus may
be provided to convert the visual field and to obtain a better
stereo-sense.
The above mentioned visual field converting apparatus is processed, for
example, as shown in FIG. 7.
First, the geometric strain of the lens is corrected and then the
difference (displacement) of the view of an object between two picture
images obtained by a displacement detecting means 101 is sensed by such
means as a correlation. Then, the distance (depth) from the front surface
of the endoscope to each point of the object is geometrically calculated
by a depth calculating means 102 to prepare a three-dimensional
information of the object. Then, by a projecting means 103 on the viewing
plane, a proper viewing point is determined for the three-dimensional
information of the object determined by the above mentioned depth
calculating means 102 and a viewing coordinates projected on the viewing
plane of each of the right eye and left eye are calculated. Then, by a
color reproducing and interpolating means 104, a color information
projected on the viewing plane is determined from the original picture
image. The clearances of the respective points are interpolated. (At this
time, a surface hiding process hiding surfaces not seen is made.) Finally,
the respective points are shadowed by a shadowing means 105.
Even if two original picture images are merely three-dimensionally or
stereo-viewed, the distance between both eyes will be small. Also, the
lens of the endoscope is generally of a wide angle. Therefore, a
sufficient stereo-sense is hard to obtain. Therefore, by converting the
parallax by using the above mentioned visual field converting apparatus, a
favorable stereo-sense can be obtained with the ordinary human eye.
FIGS. 8 and 9 show the third embodiment of the present invention.
In this embodiment, the video signal output of the encoder 57 in the second
embodiment shown, for example, in FIG. 5 is input into an A/D converter
111 as shown in FIG. 8 and is converted to a digital signal. This A/D
converter 111 is connected to the fixed contact of a 4-contact switching
switch 112 formed of a semiconductor switch or the like. The respective
switching contacts of this switching switch 112 are connected to the data
input ends of two sets of memories, that is, a left picture image (L)
memory A113A, left picture image (9L) memory B 113B and right picture
image (R) memory A114A, right picture image (R) memory B114B. The output
of the above mentioned A/D converter 111 is selectively memorized in these
memories 113A, 113B, 114A and 114B through the above mentioned switching
switch 112. The above mentioned memories 113A, 113B, 114A and 114B may be
such dual port memories as, for example, M5M4C500L made by Mitsubishi
Electric Co.
The respective data output ports of the above mentioned memories 113A,
113B, 114A and 114B are connected to the respective switching contacts of
a 4-contact switching switch 115 formed of a semiconductor switch or the
like. The fixed contact of this switching switch 115 is connected to a D/A
converter 116. The read-out outputs of the above mentioned memories 113A,
113B, 114A and 114B selectively output through the above mentioned
switching switch 115 are converted to analogue signals by the above
mentioned D/A converter 116 and are input as video signals into the color
monitor 7.
The output of the above mentioned encoder 57 is input also into a
synchronous separating circuit 121 and only a synchronous signal is taken
out of this synchronous separating circuit 121. The synchronous signal
taken out of this synchronous separating circuit 121 is input into a
control circuit 122 generating various controlling timing signals. The
above mentioned switching switches 112 and 115 and memories 113A, 113B,
114A and 114B are controlled as shown in FIG. 9 by a timing signal from
the above mentioned control circuit 122.
That is to say, as shown in FIG. 9 (A), the right eye picture images (R1,
R2, . . . ) and left eye picture images (L1, L2, . . . ) are alternately
input in each field, that is, every 1/60 second, into the A/D converter
111 and synchronous separating circuit 121. As shown in FIG. 9 (C), the
above mentioned switching switch 112 is switched in each field as
synchronized with the above mentioned input signal. The left eye picture
images L1, L3, . . . of odd number frames are memorized in the left
picture image memory A113A, the right eye picture images R1, R3, . . . of
odd number frames are memorized in the right picture image memory A114A,
the left eye picture images L2, L4, . . . of even number frames are
memorized in the left picture image memory B113B and the right picture
images R2, R4, . . . of even number frames are memorized in the right
picture image memory B114B.
On the other hand, as shown in FIG. 9 (D), the above mentioned switching
switch 115 is switched every 1/2 the period of the above mentioned
switching switch 112, that is, every 1/120 second. In the period while the
picture images are being memorized in the left picture image memory A113A,
the picture images will be read out of the right picture image memory
B114B and the other left picture image memory B114 respectively in the
period of 1/120 second. In the period while the picture images are being
memorized in the right picture image memory A114A, the picture images will
be read out of the other right picture image memory B114B and the left
picture image memory A113A respectively in the period of 1/120 second. In
the period while the picture images are being memorized in the left
picture image memory B113B, the picture images will be read out of the
right picture image memory A114A and the other left picture image memory
A113A in the period of 1/120 se | | |
