Patent ID: 8463063

Claim:
An image processing apparatus comprising: first calculating means for adding a pixel value of an image and an output of filter means for performing filtering in space directions on a modulation error of a quantized value obtained by quantizing the pixel value of the image; first quantizing means for quantizing an output of the first calculating means and outputting a quantized value serving as ΔΣ modulation data, which is a result of ΔΣ modulation performed on the pixel value; second calculating means for calculating a difference between the output of the first calculating means and the output of the first quantizing means, thereby obtaining a quantization error; second quantizing means for quantizing a portion of the quantization error and outputting a quantized value obtained through the quantization, the quantized value serving as compensating data for compensating for error diffusion in space directions; dequantizing means for dequantizing the ΔΣ modulation data; third calculating means for adding the dequantized ΔΣ modulation data and the compensating data, thereby generating time-integration-effect-using error diffusion data that generates an effect of an error diffusion method using a visual integration effect in a time direction; fourth calculating means for calculating a difference between the quantization error and the compensating data, the difference serving as a ΔΣ modulation error, which is a quantization error used for the ΔΣ modulation; and the filter means for performing filtering in space directions on the ΔΣ modulation error.