发明名称 |
Motion-based adaptive quantization |
摘要 |
There is described herein motion-based adaptive quantization for compressing video streams. Motionless portions of pictures are detected and the compression quality of these portions is increased while the compression quality of non-motionless portions is decreased. The QP of a portion of image data, such as a macroblock, is modified for successive motionless portions from a start QP to a target QP in accordance with a multi-step change. |
申请公布号 |
US9621900(B1) |
申请公布日期 |
2017.04.11 |
申请号 |
US201213670587 |
申请日期 |
2012.11.07 |
申请人 |
MATROX GRAPHICS INC. |
发明人 |
Ostiguy Jean-Jacques;Garneau Simon;Antaki Bernard;Champenois Alain |
分类号 |
H04N7/32;H04N19/136;H04N19/61 |
主分类号 |
H04N7/32 |
代理机构 |
Norton Rose Fulbright Canada LLP |
代理人 |
Norton Rose Fulbright Canada LLP |
主权项 |
1. A method for compressing a data stream comprising pictures with static regions and non-static regions, the method comprising:
detecting a static region in a picture; modifying a quantization parameter (QP), over successive pictures, of regions that remain static in the successive pictures, the QP being changed in accordance with a multi-step change from a start QP to a target QP over the successive pictures until a non-static region is detected, the QP being changed in accordance with a set of improvement levels and each one of the improvement levels is associated with a quantization parameter, wherein each one of the regions is located at a same location as the static region as detected, wherein modifying the QP comprises:
determining a current improvement level for the static region of a given picture based on a number of successive pictures comprising the static regions that precede the given picture;associating the current improvement level with the static region of the given picture; andretrieving a corresponding quantization parameter to compress the static region of the given picture; and interrupting the modifying of the quantization parameter when the non-static region is detected and applying a regular QP thereto. |
地址 |
Dorval CA |