High dynamic range codecs

摘要

A method for encoding high dynamic range (HDR) images involves providing a lower dynamic range (LDR) image, generating a prediction function for estimating the values for pixels in the HDR image based on the values of corresponding pixels in the LDR image, and obtaining a residual frame based on differences between the pixel values of the HDR image and estimated pixel values. The LDR image, prediction function and residual frame can all be encoded in data from which either the LDR image of HDR image can be recreated.

主权项

1. A method for encoding an input high dynamic range (HDR) image represented in a first color space, the method comprising:
accessing a lower dynamic range (LDR) image represented in a second color space, the LDR image corresponding to the input HDR image, wherein the second color space is different to the first color space; color transforming the input HDR image from the first color space to the second space to generate a second HDR image; generating a prediction function based on the second HDR image and the LDR image; applying the prediction function to the LDR image to obtain a predicted HDR image; computing a residual image representing differences between pixel values in the predicted HDR image and corresponding pixel values in the second HDR image; and, encoding the LDR image, the prediction function and the residual image.