Abstract: A color image processing apparatus wherein different color filters are provided in an image pickup device corresponding to plural groups of small pixels, each group of which is one unit of color pixels, and color image signals are obtained from the common position of the small pixel groups by suitably interpolating color image signals obtained from the small pixel groups.

Abstract: An image processing system capable of image enlargement and reduction. Interpolation data is stored in memory in the form of look-up tables for producing image data interpolating between adjacent pixels. The interpolation is carried out based on a selection signal determined in accordance with the designated magnification. The stored interpolation data has a plurality of data tables having distinctive conversion characteristics. A particular data table can be selected in accordance with a property of the original image.

Abstract: An image processing method and apparatus wherein document information is separated by using an optical device into two colors that are complementary to each other, converted photo-electrically and processed by using a photo-electric conversion device, and extracted on the basis of the result of processing by using a color extraction information generation device, and a color information designated by the color extraction information of the color extraction information generation device is stored in a color information storage device.

Abstract: The present invention relates to a method of estimating a halftone image in which a plurality of scanning unit areas including, at least, a unit area of (1 pixel.times.1 pixel) are set in a binary image consisting of white and black regions; a binary image obtained from estimated values based on a ratio between white and black regions within the scanning unit area; an estimated value of an optimum scanning unit area is obtained per every pixel of the halftone image is produced based on the estimated value; and further the estimated halftone image is reconverted to a binary image after processing of enlarging or reducing.

Abstract: An image reader having an automatic original feeder for feeding originals successively onto an original-setting surface, wherein an optical system for reading the images of the originals on the original-setting surface is returned to its original position when an external machine goes out of order to become incapable of receiving the image information from a means for sending out the read image information. A memory for storing the read image information is provided, so that when the external machine goes out of order to become incapable of receiving the information, the stored image information can be sent out of the external machine after the machine has been put in order.

Abstract: A method of discriminating an image by scanning an original image with a photoelectric conversion device, quantizing an image signal obtained through the photoelectric conversion device, preparing a density histogram corresponding to the quantized image signal, detecting a peak density value corresponding to the peak present on the low-density side of the density histogram and a density width of the density histogram, and discriminating the original image according to both the peak density value and the density width.

Abstract: The present invention is to provide an image processing apparatus having structure for forming a halftone image in such manner that, on a multicoded image consisting of regions differing in density formed by multicoding by using a prescribed threshold value matrix, a plurality of differing scanning unit areas are brought each to the multicoded image for each pixel in a successive manner so as to obtain values based on the ratios between the regions differing in density of the multicoded image within the unit areas, then density patterns are obtained from the above value by using the threshold value matrix, and then the halftone image is made by comparing the density patterns with the multicoded image within the unit areas, and the image processing apparatus further has structure for making the position of the threshold value matrix used for obtaining the multicoded image coincide with the position of the threshold value matrix used for obtaining the density pattern.

Abstract: A shading correction device wherein in advance to the reading of the document image, shading correction coefficients are obtained from optic information from uniform reflecting surface and stored in a memory element such as RAM, and correcting the picture signal in accordance with the content of the memory element when the document is read.

Abstract: A method of and apparatus for recording picture image wherein by a memory circuit are memorized a plurality of matrix groups each having a plurality of threshold values with a predetermined density distribution arrayed according to a predetermined order, by a circuit is divided a picture image to be recorded into a plurality of picture regions and is obtained picture density data for each of the regions is obtained, by a matrix selecting circuit is selected from the plurality of matrix groups memorized in the memory circuit matrices corresponding to the picture density data detected for each of the regions, and by a comparator is compared each picture element level of electric signals indicating a picture image information with each threshold value of the matrix selected by the matrix selecting means and is generated an output binary signals thereof.