Video Compression Using Sampled Data Analog Devices
David N. Ludington · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1982
A bandwidth compression system is described which uses charge coupled devices to achieve real time compression of standard (512 x 480) video signals. This system is composed of an encoder and a decoder. The encoder performs a two-dimensional (8 x 8) cosine transformation on the incoming video and nonlinearly quantizes the resulting coefficients to reduce the average data rate to 1 bit per pixel. Further reduction of the data rate is accomplished with a memory which inputs quantized data during one frame and outputs this data over several frames. The decoder accepts compressed data from the encoder and converts it back into video. A frame of data is first assembled in a memory and is then read out to the inverse quantizer and inverse cosine transform while a parallel memory is being loaded. The output of the transform is a video signal which, after filtering, is available for display on a standard 525-line monitor.