A color image scanning apparatus is disclosed which includes: an image sensor for scanning an original, the image sensor including a plurality of line sensors arranged in a sub-scanning direction; a determination circuit for determining the traveling speed of the image sensor in the sub-scanning direction in accordance with a magnification ratio of the original; a driving circuit for moving the image sensor in the sub-scanning direction at the speed determined by the determination circuit; a correction circuit for correcting the output of the image sensor to simultaneously output signals corresponding to an identical position of the original; a filter for filtering the output of the correction circuit in accordance with the magnification ratio of the original and the speed determined by the determination circuit, wherein the determination circuit determines the speed so that each distance of the plurality of line sensors arranged in the sub-scanning direction is substantially equal to an integral multiple of a traveling pitch per line at which the image sensor travels in the sub-scanning direction.
A color image reading device for reading a document image imaged on a line image sensor, wherein the line image sensor is a CCD including a first pixel line consisting of pixels having a first reading spectral characteristic and a second pixel line consisting of pixels having the second and third reading spectral characteristics arranged alternately; a two-layer dichroic mirror is provided on the CCD, said optical element for generating double images of an optical image corresponding to said first reading spectral characteristic and another optical image corresponding to the total of said first and second reading spectral characteristics; and the separation distance between the double images generated and imaged on the CCD by the dichroic mirror is approximately equal to the distance between said two lines of pixels on the CCD.
An inexpensive image reading apparatus which does not need a delay buffer and which permits image inputting with an image sensor array with reduced color dislocation on character edge etc. Color images are inputted in this process: Line reading circuit 102 reads three color data simultaneously. On the basis of the top and end points of a line of green data obtained by encoders and scanned position detection circuit, offset size deriving circuit 107 works out the top and end scanned positions for the data on the other colors, that is, red and blue. From the top to the end scanned positions for the respective colors, the mapping coordinates deriving circuit 108 works out the coordinates of the picture elements for the read color data. Mapping circuit 109 maps the respective color data on the image memory 110 at the positions corresponding to the coordinates obtained by the mapping coordinates deriving circuit 108.
The invention produces a document-image reading device that can analyze a speed fluctuation state of a scanner when scanning an image in the feed direction by separately extracting speed fluctuation components by determining a change in density of references scale lines; and, on the basis of the analysis result, prevents the occurrence of an image blur that can result from unstable factors of a driving mechanism of the device. The document-image reading device, which reads document image data at a specified time interval given by a reference clock signal, comprises an image sensor that can read a document image while the document-image reading device or the document moves in the feed direction. Additionally, the document-image reading device includes a chart reader for reading a reference chart portion having alternations of high-density and low-density divisions that are arranged one after another at a distance interval equal to the least pitch readable by the document-image reading device. A processor processes image data read from the reference chart portion by using a comb-type filter and by integration.
A scanner system for imaging a transparent media object comprising an illumination source for concurrently illuminating a first and second scan line of a media object, and a carriage comprising a photosensitive device located within the carriage and a light pipe affixed to a surface of the carriage is provided. The carriage is configured to receive on a first region of the photosensitive device light passed through the first scan line and the light pipe is adapted to redirect light passing through the second scan line onto a second region of the photosensitive device. The photosensitive device is operable to sample light directed onto the first and second regions.
A one-dimensional image sensor has N number of photosensitive element arrays arranged parallel to the fast scanning direction, N being a positive integer greater than 1. The adjacent N number photosensitive element arrays are separated from one another by a distance equal to the width of D number arrays in the slow scanning direction. If the moving speed of the one-dimensional image sensor in the slow scanning direction is set to M times as high as an ordinary speed, the distance between the adjacent N number photosensitive element arrays expressed in terms of the width of the D number arrays satisfies the following equation: D=Ma/n where a.noteq.nN, n being a positive integer equal to or smaller than N.
