| 摘要 |
PURPOSE:To omit a ROM by previously setting a filter factor in register by a CPU and executing vertical or horizontal filtering based on the specified factor. CONSTITUTION:An image signal Xn of an n-th line is outputted from a line memory 10 and inputted to a line memory 20 and an image signal Xn-1 of an (n-1)th line is outputted from the line memory 20. A multiplier 70 inputs a factor alpha previously set by the CPU and the Xn to execute the arithmetric operation of alphaXn. An adder 30 inputs the image signal Xn+1 of the (n+1)th line and the image signal Xn-1 of the (n-1)th line and executes the arithmetric operation of (Xn+1+Xn-1) and inputs the computed result to a multiplier 80. The multiplier 80 inputs the (Xn+1+Xn-1) and a factor beta previously set in a register 100 by the CPU and executes the arithmetric operation of beta(Xn+1+Xn-1). An adder 90 inputs the computed results of the multipliers 70, 80 and outputs the vertical filtering result of Yn=alphaXn+beta(Xn+1+Xn-1). Consequently, the ROM in an ordinary circuit can be omitted by setting the vertical and horizontal filter factors from the outside, e.g. the CPU.
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