Rca Inc.

Technology Inc. 64

Thomas R Craver

James Henry Arbeiter

The invention is embodied in a system comprising image memory and a display processor that automatically processes video data which alternate between having chrominance pixels of greater area than luminance pixels and having chrominance pixels of the same area as luminance pixels. Subsamples describing chrominance pixels of greater size are time-division-multiplexed with samples describing pixels in the image memory output when the former type of processing is done. Whichever format for video data is currently being used, the channel for reading subsamples from image memory to the display processor is used to transmit flag data controlling the mode of processing of video data performed by the video processor.

Display processor for image data with non-constant pixel size for

A display processor using first and second chrominance map memories for storing values of first and second color-difference signals, each normalized respective to luminance signal. An image memory supplies, at pixel scan rate, data used to provide read-addresses to said first and second chrominance map memories and data used to describe the luminance signal. The first and second chrominance map memory read-outs are each multiplied by the luminance signal of appropriate spatial bandwidth to generate descriptions of the first and second color-difference signals i non-normalized form. These first and second color-difference signals and a full-spatial-bandwidth luminance signal are supplied to color matrixing circuitry. The color matrixing circuitry responds to these signals to provide red, green and blue drive signals to display apparatus. The display apparatus may comprise video amplifiers for the drive signals and a color kinescope, by way of example.

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Cranbury, NJ, United States of America

Thomas R Craver