公开(公告)号：US20180367774A1

公开(公告)日：2018-12-20

申请号：US16110912

申请日：2018-08-23

Applicant: Google LLC

Inventor： Jonathan T. Barron ,  Yun-Ta Tsai

IPC: H04N9/73 ,  H04N1/60 ,  G06T5/00 ,  G06T5/40 ,  H04N9/64 ,  G06T5/20

CPC classification number: H04N9/735 ,  G06T5/001 ,  G06T5/20 ,  G06T5/40 ,  G06T2207/10024 ,  G06T2207/20016 ,  G06T2207/20081 ,  G06T2207/20084 ,  H04N1/6027 ,  H04N1/6086 ,  H04N9/646

Abstract: A computing device may obtain an input image. The input image may have a white point represented by chrominance values that define white color in the input image. Possibly based on colors of the input image, the computing device may generate a two-dimensional chrominance histogram of the input image. The computing device may convolve the two-dimensional chrominance histogram with a filter to create a two-dimensional heat map. Entries in the two-dimensional heat map may represent respective estimates of how close respective tints corresponding to the respective entries are to the white point of the input image. The computing device may select an entry in the two-dimensional heat map that represents a particular value that is within a threshold of a maximum value in the heat map, and based on the selected entry, tint the input image to form an output image.