Patent Document ID: 9648356
Application ID: 13480151
Patent Status: 1

Claim One:
1. A decoding method comprising: receiving a JPEG compressed file, the JPEG compressed file includes a low dynamic range (LDR) image and a transformed ratio image, the transformed ratio image separated as an application extension from the LDR image; decompressing the compressed JPEG file to retrieve the LDR image and the transformed ratio image, wherein the decompressing comprises dequantizing a quantized transformed ratio image to generate a transformed ratio image; applying an inverse non-linear function to the transformed ratio image to generate a decoded ratio image; reconstructing a reconstructed HDR image, the reconstructed HDR image determined by the LDR image and the decoded ratio image; and providing the reconstructed HDR image for display, wherein the LDR image has a lower dynamic range than the reconstructed HDR image, and wherein each pixel value of the decoded ratio image is from a ratio of a luminance of a pixel of an HDR image and a luminance of a corresponding pixel of the LDR image.