Circumnavigation using an increased test cell domain may be used to collect data from discontinuous characters stored in a bit map such as those printed by a dot matrix printer. The test cell domain is increased to locate a pixel and consider it a portion of the same character if it is within the minimum permissable pixel gap range. The sequence of testing must be designed to read each possible pixel and not enter an endless loop during the circumnavigation. One sequence of testing is to begin t...

An apparatus for detecting one or more contours of an image formed on a screen. The apparatus comprises a scanner for raster scanning pixels located on scan lines extending in paralllel with each other in the X direction of a two-dimensional coordinate system to successively produce binary pixel data regarding the scanned pixels. The binary pixel data have a first value representing a background forming pixel or a second value representing an object forming pixel. The binary pixel data are trans...

A method for re-tracing an end point of an image by an image processing device for converting the line images of the image data into vector data in a semi-automatic way by tracing plural line images and converting them into one vector data. The method for re-tracing the end point of the image involves tracing the line images by transferring the tracing points on the line images and continuing the previous trace processing for re-tracing the line image which follows by waiting for an instruction ...

An improved method for constructing the medial axis transform of an image is disclosed. The method requires only that one line of the image be held in memory at any given time. The method runs in a time of order N, where N is the number of pixels in the image.

A pattern reading system by line segment approximation comprising the steps of tracing the contour and simultaneously, seeking out as candidate extreme points the points at which the inner products of coordinate point vectors and directional vectors at coordinate points of the contour being traced are largest, and feeding out these candidate extreme points as real extreme points when the differences between the inner products of the direction vectors and the inner products of the candidate extre...

The recognition of patterns is accomplished through boundary tracing and subsequent storage of encoded range testable data commensurate with the occurrence, interrelationship and orientation of geometric features on the pattern boundaries. The encoded data is compared with generalized prototypes which define the geometric shape of all probable permutations of all possible patterns to be recognized, a match between the encoded data and a prototype constituting identification of the pattern.

A projection television receiver has a cathode ray tube with an electron gun for emitting an electron beam incident on a screen, an electromagnetic deflection yoke and an electromagnetic focusing coil. A horizontal deflection driving circuit is coupled to a horizontal deflection coil and provides deflection current to the horizontal deflection coil for scanning the beam repetitively on the screen. The focusing coil is driven from a current step-down transformer having a primary winding coupled i...

A projector including a projector to superpose pictures on a screen, the pictures being displayed on cathode ray tubes corresponding to different colors. Reference signals are inputted to the corresponding cathode ray tubes for a predetermined period of time after application of power so that one of both a picture with a uniform brightness and a picture with a uniform color is formed all over the screen in response to the reference signals. The projector effectively reduces the fluctuation in re...

A hydrostatic drive for reciprocating the transfer bar of a multi-station transfer mechanism wherein the motive power is supplied by a swashplate type pump, the control arm of which is pivoted to accelerate and decelerate the transfer bar by means of a yoke connected to the end of the control arm and adapted to be displaced by a control cylinder supplied with pressure fluid from an auxiliary pump through a four-way solenoid operated, spring centered valve. When the valve is in the centered posit...

A television apparatus, for generating a deflection rate parabolic auxiliary deflection current that corrects convergence distortions, includes a deflection generator output stage coupled to a deflection winding. The deflection generator output stage generates a trace scanning current during a trace interval. The primary winding of a transformer is coupled in a current path of the trace current. A parabolic voltage developing capacitance is coupled across a first secondary winding of the transfo...