DEBANDING IMAGE DATA BASED ON SPATIAL ACTIVITY

摘要

A method for attenuating banding in image data may involve receiving a stream of input pixels. The method may then include applying a bi-lateral filter to a first portion of the stream of input pixels to generate a first filtered output and applying a high pass filter to a second portion of the stream of input pixels to generate a second filtered output. The method may then determine a local activity and a local intensity associated with the first portion of the stream. The method may then include blending the first filtered output with the first portion of the stream of input pixels based at least in part on the local activity and the local intensity to generate a third filtered output. Afterward, the method may combine the third filtered output with the second filtered output to generate a fourth filtered output that may be output as the image data.

主权项

1. An image signal processing system, comprising:
processing circuitry configured to reduce banding artifacts in image data to be depicted on a display, wherein the processing circuitry is configured to:
receive a stream of pixels associated with the image data;collect statistics regarding the stream of pixels;separate the stream of pixels into low frequency components and high frequency components;filter the low frequency components to remove noise, thereby generating a first filtered output;filter the high frequency components to remove noise, thereby generating a second filtered output;determine a local activity of the low frequency components;blend the first filtered output with the low frequency components based on the local activity, thereby generating a third filtered output; andcombine the third filtered output with the second filtered output, thereby generating a fourth filtered output;send the fourth filtered output to the display.