| 摘要 |
An image processing apparatus having a compensation value calculating unit, wherein an XOR element compares the signs of a difference A with a difference r and output the difference A as a compensation value when the signs are the same, while decides that an edge portion of an image data is detected when the signs are different and wherein a comparator compares the absolute value of the difference A with a value obtained by multiplying a constant a with the absolute value of the difference r in a multiplier and adding a constant b in a second adder. When the result of the comparison is that the former is less than the latter, the input predetermined difference A is output as a compensation value. When the former is larger than the latter, the value obtained by multiplying the complement of 2 of the difference r calculated in the complement calculating unit with a constant c in the first multiplier and further adding a constant d in the first adder is selected by a switching unit, and the selected value is output as a standard compensation value.
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