Graphical data processing

摘要

A method of controlling graphical data compression levels for a series of images of varying area in order to maintain a consistent image quality, irrespective of image area. An image of a first area is compressed using a first compression value. When the first image is decompressed for display, it is associated with a first image quality. When a new image with a different area is generated, it is compressed using a new compression value derived from the first compression value. The new compression value is suitable for delivering an image quality, when the new image is decompressed for display, substantially the same as the image quality of the first image.

主权项

1. A method of image processing for use with an image processing system comprising a processor, the method comprising:
rendering, via a rendering engine operating under control of the processor of the image processing system, a first image with a first area and compressing, via an encoder operating under control of the processor of the image processing system, the first image using a first compression value, wherein compressing the first image using the first compression value produces a compressed version of the first image for decompression for display at a first visual quality level; rendering, via the rendering engine, a second image with a second area; and calculating from the first compression value and using the processor a second compression value for compressing the second image and compressing via the encoder the second image using the second compression value, the second compression value being related to the first compression value by a function proportional to the logarithm of the ratio of the second image area to the first image area; wherein compressing the second image using the second compression value produces a compressed version of the second image for decompression for display at a second visual quality level; wherein the first visual quality level and the second visual quality level are substantially the same.