Patent ID: 9516328
Filing Date: 2016-12-06
CPC Classification: H04N

Claim Text:
1. An apparatus, comprising: a video encoder for encoding image data for a picture in a single encoding pass using rate control, wherein the rate control involves defining a quantization step size value and a rounding offset value and refining the quantization step size value and the rounding offset value, wherein the quantization step size value and the rounding offset value are refined by initially defining at least one of the quantization step size value and the rounding offset value as an estimate, and the other one of the quantization step size value and the rounding offset value is defined based on the estimate, and wherein the estimate is based on modeling a target number of bits for the picture and wherein the image data for the picture is encoded responsive to the refined quantization step size value and the refined rounding offset value, and wherein the quantization step size value and the rounding offset value are refined based on a judgement of whether the rounding offset is outside a predetermined range that guarantees consistent visual quality between temporally adjacent pictures.