Producing a very high quality still image from HDMAC transmission

An experimental system for grabbing high definition television pictures from HDMAC transmission is presented. The hardware part of the system is based on a video sequencer which is used for digitizing, storing, and displaying the HDMAC signal. The HDMAC decoder itself has been implemented using computer software. The system is able to receive and display approximately a 3-second-long sequence of HDTV pictures. The software part of the system employs image enhancement algorithms to produce high quality still images. The interlaced transmission format is converted to progressive and both temporal and spatial noise filtering is applied to improve the image quality in the presence of transmission noise. The algorithms depend on simple motion detection and nonlinear filtering. Examples of the received images and of the performance of the image enhancement algorithms are shown