Patent Document ID: 20160301934
Application ID: 15035551
Patent Status: 0

Claim One:
1. A method for pre-dithering images to be coded by an encoder, the method comprising: receiving an input low dynamic range (LDR) image in a first bit depth to be encoded by the encoder ( 130 ) at a target bit rate; generating ( 200 A- 1 , 200 B- 1 ) a random noise image ( 202 ); filtering ( 205 ) the random noise image with a spatial filter ( 207 ) to generate a spatial-filtered noise image ( 204 ); storing the spatial-filtered noise image in a ring buffer ( 210 ); repeating the generation of the spatial-filtered noise images ( 204 ) and storing the same in the ring buffer ( 210 ); applying ( 200 A- 2 , 200 B- 2 ) a temporal filter ( 212 ) to images in the ring buffer ( 210 ) to generate a temporal-filtered noise image ( 214 ); adding ( 330 ) the temporal-filtered noise image to the input LDR image to generate a noise-enhanced LDR image; and quantizing the noise-enhanced image to a second bit-depth to generate an output dithered LDR image ( 122 ), wherein the second bit-depth is lower than the first bit depth.