Multi-compatible low and high dynamic range and high bit-depth texture and video encoding system
A method of processing image data includes generating image data including luminance and chrominance data representing a selected object, separating the luminance and chrominance data, storing the separated luminance and chrominance data in corresponding separate spaces in memory, and separately compressing the stored luminance and chrominance data.
1. A method for processing image or video data comprising:
receiving as input a plurality of scene textures,
generating grayscale CL, image CC, and index ID textures;
multiplying the image CC texture by the scene texture;
scaling the grayscale CL texture;
encoding the grayscale CL, image CC and index ID textures;
obtaining the dot product between the grayscale CL and index ID encoded textures to obtain a dot texture;
rescaling back the dot texture; and
multiplying the encoded CC texture by the rescaled dot texture and a factor =3.0.
2. A method processing image or video data comprising:
receiving as input a High Dynamic Range (HDR) video or image;
generating a low dynamic range image (LDR) from the input HDR image;
generating a ratio video or image between the LDR and HDR (LDR/HDR); and
generating a coded video or image that includes the LDR and the ratio images.
3. The method of claim 2 , wherein the ratio image is scaled to the range [0,1], and afterwards is gamma corrected.
4. The method of claim 2 , wherein the video or image is stored in application specific segment and the LDR video or image is stored in the base segment of the encoding file format.
5. The method of claim 2 , wherein the coded video or image is JPEG, MPEG, JPEG-2000, AVI, TIFF, HEVC, BMP, GIF, or ZIP.
6. The method of claim 2 , wherein the HDR input video or image is either a floating point or an integer values image.
7. The method of claim 2 , where the input is receiving an HDR video or image and a LDR image.
8. The method of claim 7 , wherein if the LDR input video or image is not a gamma corrected linear signal, the LDR input video or image undergoes an inverse gamma correction.
9. The method of claim 2 , wherein the LDR video or image is a linear signal, and after the ratio image computation, undergoes a gamma correction.
10. A method for decoding an image video or comprising:
decoding coded video or images comprising LDR and ratio images;
applying an inverse gamma on the LDR images;
applying an inverse gamma on the ratio images;
scaling the ratio image back from [0,1] to the original maximum and minimum values; and
reconstructing the HDR image based on the LDR and ratio images.
11. The method of claim 10 , wherein the coded video or image is decoded with standard decoders.