Local image statistics collection

摘要

Systems and methods for generating local image statistics are provided. In one example, an image signal processing system may include a statistics pipeline with image processing logic and local image statistics collection logic. The image processing logic may receive and process pixels of raw image data. The local image statistics collection logic may generate a local histogram associated with a luminance of the pixels of a first block of pixels of the raw image data or a thumbnail in which a pixel of the thumbnail represents a downscaled version of the luminance of the pixels of the first block of the pixel. The raw image data may include many other blocks of pixels of the same size as the first block of pixels.

主权项

1. A method for generating local image statistics of image data comprising:
receiving, via processing circuitry, input pixels of a block of the image data; determining, via the processing circuitry, luminance values associated with the input pixels of the block of the image data; and generating, via the processing circuitry, a local image statistic using the luminance values associated with the block of the image data or red, green, or blue subpixels of the block of the image data, or a combination thereof, wherein generating the local image statistic comprises:
downsampling the input pixels into a downsampled pixel with red, green, and blue components;determining an average luminance of the red, green, and blue components of the downsampled pixel;determining a maximal luminance of the red, green, or blue components of the downsampled pixel; andmixing the average luminance and the maximal luminance according to a global mixing value applied to the input pixels.