Abstract: A color converting apparatus is provided with a table memory for storing pieces of color converting data defined in an output color space at color converting addresses, and a signal receiving section for receiving three signals designating an input color in a lightness-color difference space. The color converting addresses are placed at lattice points of cubic blocks formed by partitioning the lightness-color difference space in a lightness direction and first and second color difference directions. Each of the cubic blocks has the lattice points Pa, Pb, Pc and Pd at its lower plane and the lattice points Pe, Pf, Pg and Ph at its upper plane. Each of the cubic blocks is partitioned into a first triangular prism having the lattice points Pa, Pb, Pc, Pe, Pf and Pg and a second triangular prism having the lattice points Pa, Pd, Pc, Pe, Ph and Pg.

Abstract: The present invention relates to a method and apparatus applied to a widely-used and high-speed color conversion which is utilized in a color printer, a color display apparatus and the like, and provides a novel three-dimensional interpolation operation by use of a triangle-pole shaped interpolation unit-space. Input color signals R,G, and B are converted into lightness signal Y and chromaticity signals Cr, Cb which constitute a three-dimensional space. This three-dimensional space is dissected into rectangular parallelopipeds and is further divided into two prisms having base planes parallel to the chromaticity plane CrCb. A prism judging section 207 judges which of prisms an input color is involved in. There are provided a plurality of color conversion table memories 210.about.215 which store output values corresponding to input values constituting respective points of the prism and difference values of mutual output colors and further difference values of mutual difference values.

Abstract: An image reading system with a light irradiating portion for irradiating light onto a predetermined range of the surface of a manuscript to be read, an image reading portion for outputting a signal obtained by first converting light reflected or transmitted by the manuscript into a luminance signal and then referring to a look-up table, an interface portion for inputting a signal from and outputting a signal to an external computing device, a manuscript scanning portion for scanning the surface of the manuscript, a central processing portion for controlling the manuscript scanning portion and a storage portion capable of storing at least one kind of density transformation curve data.

Abstract: An image reading system for reading color information on an original picture, the reading system comprising a scanning section for optically scanning the original picture and a color chip having a predetermined density value and a reading section for receiving reflection or transmission light obtained with the scanning section optically scanning the original picture and the color chip and for converting the reflection or transmission light into the corresponding electric signal. The reading system is arranged to optically read a density of the color chip so as to constitute a densitometer with the read density of the color chip being adjusted to be substantially coincident with the predetermined density and to measure densities of highlight and shadow points on the original picture by means of the densitometer.

Abstract: A color conversion apparatus is described whereby color within at least one specific region of a color picture can be converted to a different color in a reproduced picture, while enabling gradations of color and lightness within that region to be left substantially unchanged. The conversion is based upon setting of pre-calculated output values in a table memory within a color conversion section, by an initialization operation, and conversion can be a change in one color attribute or in a combination of attributes of respective color values within the selected region.

Abstract: A method of data display for a system which includes a main image memory having stored therein data representing a main image, a display memory coupled to temporarily hold data transferred thereto form the main image memory, and a display apparatus for displaying at least a selected portion of the data held in the display memory, whereby while scrolling is being executed in the horizontal or vertical display direction, new data are transferred from the main image memory to the display memory only when the limits of the data currently held in the display memory are exceeded, and with only data for one display line or column being transferred in such a case.

Abstract: An image synthesizing system provided with an interpolation circuit for interpolating data of neighboring pixels of a multi-level picture, a decompression circuit for converting data representing characters and graphic forms into data of pixels thereof, a first look-up table unit for converting the data of pixels composing the characters and graphic forms into data representing gradation levels of a four-color halftone, a second look-up table unit for outputting control data for synthesis which includes halftone-dot pattern information used to indicate halftone-dot patterns corresponding to the characters and the graphic forms and region discriminating information used to indicate which of the characters and the graphic forms should be clipped, a multi-level picture and bi-level element comparison circuits, which are independent of each other, respectively converting the multi-level picture and the bi-level characters and graphic forms into bi-level dot patterns and a selecting circuit for selectively outputt

Abstract: In a method and an apparatus for processing an image, a small screen dot pattern is prepared. A large screen dot pattern is generated by copying or repeatedly reading out the small screen dot pattern. Data of a variable tone image are processed with the large screen dot pattern and are thereby converted into processed image data representative of a screen dot image. The screen dot image may be recorded in a suitable way.

Abstract: Color correction method and processor for improving the quality of color reproduction in a color picture recording unit or display unit in a color copy machine, a color facsimile or a color printer. A memory means previously stores in a table values of secondary color correction image data used for recording corresponding to values of primary image data produced through a color scanning of a color picture. The secondary color correction image data are read out from the table by addressing signals formed from the three color components of the primary image data. Data bits for the addressing signals of the three color components of the primary image data are assigned unevenly depending on the contribution factor of each in forming the three color components of the secondary color crrection image data, thereby reducing the required number of addressing bits and associated memory.

Abstract: In an infrared image pickup device, an infrared image signal and a visible image signal are picked up from an object to be photographed, the infrared signal, the visible image signal and/or a visible profile image signal are transmitted in a time-division manner and are separated from each other, and an infrared image, a visible image, a visible profile image, an image obtained by superposing the visible image on the infrared image, and an image obtained by superposing the visible profile image on the infrared image are selectively displayed on different display monitors or a single display monitor in a synchronized manner or on said single display monitor in a separate manner.

Abstract: A main index signal is generated concurrently with the excitation of a plurality of triplet groups of color generating segments by a sweeping electron beam at a frequency which is a nonintegral number multiplied by the triplet frequency, a frequency at which the triplet groups are excited per a unit time. An auxiliary index signal is generated preceding the occurrence of the main index signal. A frequency counter is provided to convert the frequency of the main index signal to the triplet frequency. The auxiliary signal is delayed, differentiated and used to reset the counter to cancel the content therein to initiate counting of the significant bits of the main index signal at the start of each of the line scansions.