IMAGE INFORMATION CONVERTER AND ITS DEVICE AND PRODUCT SUM ARITHMETIC UNIT

摘要

PROBLEM TO BE SOLVED: To select the number of taps of an estimating equation to perform an optimal converting processing in accordance with characteristics of am image in converting SD (a video signal of an NTSC method) image into an HD (the video signal of a high vision) image. SOLUTION: Ratio DRratio between dynamic range DRall of all SD data segmented by an area segmenting circuit 2 and a part of the dynamic range DRpartial is calculated in a tap selecting parameter calculating circuit 3. A class code class is generated from a space class and a moving class mv-class in a class code generating circuit 8 and coefficient data is read out of ROM tables 9, 10 by regarding the class as an address. HD data is generated by a linear estimating equation consisting of twenty-five pixels in an estimating operation circuit 13 and the HD data is generated by the linear estimating equation consisting of fifteen pixels in an estimating operation circuit 14. The DRratio is compared with a threshold value in a switch circuit 15 and the HD data is selected and outputted in accordance with the comparison result.