Patent ID: 9654781
Date: 2017-05-16
CPC Classifications: G06T,H04N

Claim:
1. An apparatus comprising a bitstream stored on a non-transitory machine-readable media, wherein the bitstream is characterized by high dynamic range image data in a compressed format, wherein the compressed format comprises: a compressed JPEG base image; high dynamic range (HDR) reconstruction data, wherein the HDR reconstruction data comprise a quantized luma ratio image and one or more sets of quantized residual chroma values; and a JPEG application marker separating the base image from the HDR reconstruction data, wherein the apparatus further comprises a processor configured to execute instructions to: parse the bitstream to extract the compressed JPEG base image and the HDR reconstruction data; generate a decoded base image based on the compressed JPEG based image; extract quantization parameters from the HDR reconstruction data; generate a dequantized luma ratio image and one or more sets of dequantized residual chroma values based on the quantization parameters, the quantized luma ratio image, and the one or more sets of quantized residual chroma values; linearize the dequantized luma ratio image to generate a linearized luma ratio image; and generate an output HDR image based on the one or more sets of dequantized residual chroma values, the linearized luma ratio image, and the decoded base image.