This technology is a deinterlacing device and method that determines edge-direction detection parameters based on the difference between pixel pairs at 30°, 45°, 90°, 135°, and 150° angles in the lines above and below the target interpolation pixel. It uses fuzzy logic with triangular curve membership functions to make a soft decision to select the interpolation direction, then fills the value by averaging the two pixels in that direction.
Even with digital video equipment where progressive scanning is standard, there is often a need to play back legacy interlaced footage, which frequently results in artifacts like line crawling and flickering. Methods that rely on a single criterion for edge direction often struggle in areas with ambiguous boundaries, leading to broken or jagged diagonal lines.
This technology applies three different triangular functions—WS, S, and SS—based on the distance from the target interpolation pixel to differentially evaluate the reliability of central and outer directions. This allows for the selection of the appropriate edge direction through lightweight computation that compares only the minimum condition values. It can be applied to real-time conversion circuits in video conferencing terminals and digital signage players, enabling the immediate output of video with smooth diagonal contours using simple hardware.
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