VIDEO SIGNAL MAGNIFYING AND REDUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To realize magnifying/reducing processing at an optional magnification by the signal processing of a single clock. SOLUTION: A memory circuit 2 temporarily stores an input video signal from an input terminal 1. A writing control circuit 16 inhibits the memory circuit 2 from writing corresponding to the horizontal compressibility of a video to thin the picture element of the input video signal. A reading control circuit 17 inhibits the memory circuit 2 from supplying a read clock corresponding to the horizontal magnification of the video and controls it to repeatedly read the picture element of the input video signal. An interpolation filter circuit 3 gives filtering processing by means of an interpolation coefficient corresponding to the horizontal scaling factor of the video to the output signal of the memory circuit 2 to attain a smooth and horizontally magnified/compressed video. A scaling factor control circuit 15 controls the interpolation coefficientβat the writing control circuit 16 and the interpolation filter 3 corresponding to the compressibility at the time of horizontally compressing the video, and controls the interpolation coefficientβat the reading control circuit 17 and the interpolation filter 3 corresponding to the magnification at the time of horizontally magnifying the video.