Error diffusion with color conversion and encoding

摘要

YCbCr image data may be dithered and converted into RGB data shown on a 8-bit or other bit display. Dither methods and image processors are provided which generate the banding artifact free image data during this process. Some methods and image processors may applying a stronger dither having a same mean with a larger variance to the image data before it is converted to RGB data. Others methods and image processors may calculate a quantization or encoding error and diffuse the calculated error among one or more neighboring pixel blocks.

主权项

1. A dithering method comprising:
encoding an original pixel block and generating a reconstructed pixel block therefrom; comparing values of the original pixel block and the reconstructed pixel block; applying an error function to a difference between the compared values to calculate an error statistic using a processing device; and incorporating the error statistic in at least one value of at least one neighboring pixel block to the original pixel block.