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| 20080232459 | SYSTEM AND METHOD TO CONTROL COMPRESSED VIDEO PICTURE QUALITY FOR A GIVEN AVERAGE BIT RATE - Picture level rate control systems, apparatuses and methods are described which indirectly control bit rate through peak signal to noise ratio (PSNR), thereby providing a stable PSNR while maintaining a given target average bit rate. In a preferred implementation, encoding is performed in conjunction with macroblock QP modulation. In this way, the picture level rate control provides stable temporal quality and the macroblock QP modulation provides stable spatial quality. By way of example, the number of bits generated in a group of pictures (GOP) is controlled by modulating the target bit allocation for a group of pictures (GOP) based on coded picture buffer (CPB) fullness. Macroblocks are encoded for each picture based on a rate-distortion model, which is modified in response to the relative fluctuation of PSNR of pictures within a group of pictures. | 09-25-2008 |
| 20090232210 | ADVANCED VIDEO CODED PICTURES - REDUCED COST COMPUTATION OF AN INTRA MODE DECISION IN THE FREQUENCY DOMAIN - A method of intra mode prediction uses a block of pixels and their horizontal H | 09-17-2009 |
| 20100158106 | SIMD-PROCESSOR-FRIENDLY MPEG-2 INTER-QUANTIZER - A method and apparatus for performing quantization during video compression, such as within an MPEG-2 encoder. Inter-quantization is particularly recited in this implementation, although the teachings may be applied to intra-quantization as well. Computationally intensive portions of the quantization process are split into multiple components in response to differing execution probability. A first component is executed within each quantization iteration, and preferably is performed in parallel, such as using SIMD processing. At least one additional component, such as a second component, is serially processed in response to detecting a condition that does not arise with each loop iteration. Preferred embodiments of the invention replace division operations with a combination of multiply and shift operations, while making extended use of table lookup procedures to reduces processing overhead. | 06-24-2010 |
| 20100158107 | SIMD-PROCESSOR-FRIENDLY MPEG-2 INTRA-QUANTIZER - A method and apparatus for performing quantization during video compression, such as within an MPEG-2 encoder. Intra-quantization is particularly recited, although the teachings may be applied to inter-quantization as well. Computationally intensive portions of the quantization process are split into multiple components in response to differing execution probability. A first component is executed within each quantization iteration, and preferably is performed in parallel, such as using SIMD processing. At least one additional component, such as a second component, is serially processed in response to detecting a condition that does not arise with each loop iteration. Preferred embodiments of the invention replace division operations with a combination of multiply and shift operations, while making extended use of table lookup procedures to reduces processing overhead. | 06-24-2010 |
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| 20090257488 | ESTIMATION OF I FRAME AVERAGE RATE QUANTIZATION PARAMETER (QP) IN A GROUP OF PICTURES (GOP) - Rate-QP estimation for an I picture is disclosed which involves the steps of: providing an input group of pictures (GOP); selecting an input I picture within the GOP; and outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input I picture. The outputting step may involve calculating intra luma and chroma Rate-QP estimates from corresponding intra luma and chroma histograms; offsetting the intra chroma Rate-QP estimate to form an offset intra chroma estimate; and setting a bit rate corrected Rate-QP for the input I picture to a corrected sum of the previous estimates. The histograms are formed with estimates of intra prediction coefficients, where an intra/non-intra mode is selected that results in a lowest SATD for each macroblock in the GOP. The methods may be implemented into a computer program, possibly resident in an advanced video encoder. | 10-15-2009 |
| 20090257496 | ESTIMATION OF B FRAME AVERAGE RATE QUANTIZATION PARAMETER (QP) IN A GROUP OF PICTURES (GOP) - Rate-QP estimation for a B picture is disclosed which involves: providing an input group of pictures (GOP); selecting an input B picture within the GOP; and outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input B picture. The outputting step may involve calculating intra/non-intra luma and chroma Rate-QP estimates from corresponding intra/non-intra luma and chroma histograms; offsetting the intra/non-intra chroma Rate-QP estimate to form respective offset intra/non-intra chroma estimates; and setting a bit rate corrected Rate-QP for the input B picture to a corrected sum of the previous estimates. The histograms are formed using an input of the lowest SATD forward, backward, and bidirectional prediction coefficients, and the intra prediction coefficients, where an intra/non-intra mode is selected, which results in a lowest SATD for each macroblock in the GOP. The methods may be implemented into a computer program, possibly resident in advanced video encoders. | 10-15-2009 |
| 20090257506 | ESTIMATION OF P FRAME AVERAGE RATE QUANTIZATION PARAMETER (QP) IN A GROUP OF PICTURES (GOP) - Rate-QP estimation for a P picture is disclosed which involves the steps of: providing an input group of pictures (GOP); selecting an input P picture within the GOP; and outputting, to a computer readable medium, a bit rate corrected Rate-QP, R(QP), for the input P picture. The outputting step may involve calculating intra/non-intra luma and chroma Rate-QP estimates from corresponding intra/non-intra luma and chroma histograms; offsetting the intra/non-intra chroma Rate-QP estimate to form respective offset intra/non-intra chroma estimates; and setting a bit rate corrected Rate-QP for the input P picture to a corrected sum of the previous estimates. The histograms are formed with estimates of intra and forward prediction coefficients, where an intra/non-intra mode is selected that results in a lowest SATD for each macroblock in the GOP. The methods may be implemented into a computer program, possibly resident in an advanced video encoder. | 10-15-2009 |
