ADAPTIVE SHADING CORRECTION

摘要

The present disclosure provides an adaptive shading correction method for correcting an image for lens shading, including segmenting the image into a plurality of blocks of pixels and identifying hue-flat blocks with a relatively low hue variance, where the hue-flat blocks are clustered into at least one cluster based on a spatial distribution of the blocks. Selected modification parameters for modifying an average shading mesh are identified by modifying the average shading mesh along a plurality of dimensions using a plurality of modification parameters, and processing the at least one cluster with the average shading mesh as modified so as to identify the selected modification parameters. The average shading mesh is modified using the selected modification parameters to generate a shading correction mesh, which is used to correct the image for lens shading.

主权项

1. An adaptive shading correction method for correcting an image for lens shading, the adaptive shading correction method comprising:
segmenting the image into a plurality of blocks of pixels; identifying hue-flat blocks of the plurality of blocks, the hue-flat blocks having a relatively low hue variance; clustering the hue-flat blocks into at least one cluster based on a spatial distribution of the hue-flat blocks; identifying selected modification parameters for modifying an average shading mesh by:
modifying the average shading mesh along a plurality of dimensions using a plurality of modification parameters, different ones of the plurality of modification parameters corresponding to a respective different dimension of the plurality of dimensions, andprocessing the at least one cluster,so as to identify the selected modification parameters;modifying the average shading mesh using the selected modification parameters to generate a shading correction mesh; andcorrecting the image for lens shading using the shading correction mesh.