Patent ID: 8666186

Claim:
A computer-enabled method of lossy compressing a high dynamic range (HDR) video, the method comprising: mapping floating point image data values of a frame of the HDR video from a light linear space to a perceptually linear space using a first non-linear mapping function, wherein a value in the light linear space is proportionate to the power of a light source, and wherein a value in the perceptually linear space is proportionate to a visual perceived brightness; compressing the floating point image data values in the perceptually linear space; determining a residual image based on the compressing of the floating point image data values in the perceptually linear space; determining floating point discrete cosine transform (DCT) frequency coefficients of the floating point image data values of the residual image; quantizing the floating point DCT frequency coefficients; compressing the quantized floating point DCT frequency coefficients, wherein the compression of the quantized floating point DCT frequency coefficients is lossless; and storing the compressed quantized floating point DCT frequency coefficients.