Digital signal video color compression method and apparatus

• Main Authors: YOSIM; PAUL S, LUCAS; BRUCE D, MACINNIS; ALEXANDER G
• Format: Patent
• Language: English
• Published: 13.06.1995
• Edition: 6
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DISPLAY; EDUCATION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; SEALS

This invention provides a method of and apparatus for compressing digital video color signals derived from a natural image and generating display signals for a color image composed of pixels derived from the compressed signals in which digital color signals representative of color depth intensities of three colors for each pixel to be displayed, each color signal having at least four bits representing the color intensity of a corresponding color for a corresponding pixel and arranged from most to least significant bits, are received; a digital dither signal for each pixel to be displayed is generated; a selected number of the most significant bits of each received color signal are summed with the corresponding generated dither signal; a selected number of the least significant bits of the summed color and dither signals are discarded to compress the corresponding received color signal; the compressed color signals related to a common pixel are concatenated to generate a digital output signal having a predetermined bit length less than the summed bit lengths of the received digital color signals and representative of the depth intensities of three colors for the common pixel; and analog display driver signals representative of the color intensities of pixels to be displayed are generated by selecting from a color lookup table stored in a digital to analog converter analog signals corresponding to the stored output signals.