Method and apparatus for finding data quantisation error

摘要

A method, apparatus, and computer program product storing pre-calculated quantization error data relating to a data quantization process. After receiving data to be quantized, quantizing the data to reduce the number of significant bits present therein. Finally, a quantization error is determined for the quantized data from the pre-calculated quantization error data.

主权项

1. A method comprising:
storing pre-calculated quantization error data relating to a data quantization process, wherein the pre-calculated quantization error data relates to an image pixel quantization process; receiving data to be quantized, wherein the data comprises a plurality of image color channels, and wherein the data to be quantized is image pixel data from an image; quantizing the data to reduce the number of significant bits thereof; and determining a quantization error for the quantized data from the pre-calculated quantization error data, wherein a first set of pre-calculated quantization error data is generated for use with two or more color channels and a second set of pre-calculated quantization error data is generated for use with a third color channel, wherein the determined quantization error is dispersed to surrounding pixels in the image, in a pattern according to an image dithering filter, and wherein use of the pre-calculated quantization error data reduces a time taken for conversion of received data relative to quantization of the received data without using the pre-calculated quantization error data.