| 摘要 |
PURPOSE:To remarkably improve the gradation reproductivity of the low density and high density areas of an input level by extracting a low order bit from a binarized error, distributing to one of the periphery of a noticed picture element, supplying '0' in the low order bit of the binarized error and distributing to the peripheral picture element. CONSTITUTION:A binarized error distribution arithmetic means 113 extracts the low order (n) bits from the binarized error Exy to output as the binarized error Exyl, further, the low order n bits of the binarized error Exy is supplied with 0 to output as the binarized error Exyu. An error distribution value arithmetic means 110 operates an error distribution value corresponding to the untreated picture elements A-D of the noticed picture element periphery 102 from the binarized error Exyu and a distribution coefficient from a distribution coefficient generating means 111, an error updating means 112 adds one of the error distribution values to the binarized error Exyl to and a residual error distribution value to an accumulated error at a corresponding picture element position in an error storing means 101 and restore. Thereby, the sums of the binarized errors and the error distribution values of the peripheral picture element are made coincide and the gradation reproductivity of the low density and high density areas of the input level can be improved.
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