Systems and methods for local tone mapping

摘要

Systems and methods for local tone mapping are provided. In one example, an electronic device includes an electronic display, an imaging device, and an image signal processor. The electronic display may display images of a first bit depth, and the imaging device may include an image sensor that obtains image data of a higher bit depth than the first bit depth. The image signal processor may process the image data, and may include local tone mapping logic that may apply a spatially varying local tone curve to a pixel of the image data to preserve local contrast when displayed on the display. The local tone mapping logic may smooth the local tone curve applied to the intensity difference between the pixel and another nearby pixel exceeds a threshold.

主权项

1. An image signal processing system comprising:
local tone mapping logic to apply spatially varying tone curves to image data, wherein the local tone mapping logic comprises a spatially varying grid of lookup tables of tone curves indexed by luminance associated each pixel of the image data; and spatially varying color correction matrices to apply spatially varying color correction matrices to the image data, wherein each of the spatially varying color matrices are determined based on each spatial location of each pixel with respect to a frame of the image data.