公开(公告)号：US20070183503A1

公开(公告)日：2007-08-09

申请号：US11621980

申请日：2007-01-10

Applicant: Barin Haskell ,  David Singer ,  Adriana Dumitras ,  Atul Puri

Inventor： Barin Haskell ,  David Singer ,  Adriana Dumitras ,  Atul Puri

IPC: H04N11/02 ,  H04N7/12

CPC classification number: H04N19/52 ,  H04N7/50 ,  H04N19/107 ,  H04N19/124 ,  H04N19/13 ,  H04N19/132 ,  H04N19/137 ,  H04N19/139 ,  H04N19/146 ,  H04N19/15 ,  H04N19/152 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/196 ,  H04N19/40 ,  H04N19/46 ,  H04N19/463 ,  H04N19/48 ,  H04N19/51 ,  H04N19/513 ,  H04N19/577 ,  H04N19/587 ,  H04N19/61 ,  H04N19/625

Abstract: A method and apparatus for performing motion estimation in a digital video system is disclosed. Specifically, the present invention discloses a system that quickly calculates estimated motion vectors in a very efficient manner. In one embodiment, a first multiplicand is determined by multiplying a first display time difference between a first video picture and a second video picture by a power of two scale value. This step scales up a numerator for a ratio. Next, the system determines a scaled ratio by dividing that scaled numerator by a second first display time difference between said second video picture and a third video picture. The scaled ratio is then stored calculating motion vector estimations. By storing the scaled ratio, all the estimated motion vectors can be calculated quickly with good precision since the scaled ratio saves significant bits and reducing the scale is performed by simple shifts.

公开(公告)号：US20060193382A1

公开(公告)日：2006-08-31

申请号：US11344591

申请日：2006-01-30

Applicant: Barin Haskell ,  Adriana Dumitras ,  Atul Puri

Inventor： Barin Haskell ,  Adriana Dumitras ,  Atul Puri

IPC: H04N11/04 ,  H04B1/66 ,  H04N11/02 ,  H04N7/12

CPC classification number: H04N19/19 ,  H04N19/103 ,  H04N19/147 ,  H04N19/15 ,  H04N19/152 ,  H04N19/17 ,  H04N19/176

Abstract: A Method And Apparatus For Control of Rate-Distortion Tradeoff by Mode Selection in Video Encoders is Disclosed. The system of the present invention first selects a distortion value D near a desired distortion value. Next, the system determines a quantizer value Q using the selected distortion value D. The system then calculates a Lagrange multiplier lambda using the quantizer value Q. Using the selected Lagrange multiplier lambda and quantizer value Q, the system begins encoding pixelblocks. If the system detects a potential buffer overflow, then the system will increase the Lagrange multiplier lambda. If the Lagrange multiplier lambda exceeds a maximum lambda threshold then the system will increase the quantizer value Q. If the system detects a potential buffer underflow, then the system will decrease the Lagrange multiplier lambda. If the Lagrange multiplier lambda falls below a minimum lambda threshold then the system will decrease the quantizer value Q.

公开(公告)号：US20060062310A1

公开(公告)日：2006-03-23

申请号：US11274495

申请日：2005-11-15

Applicant: Barin Haskell ,  Atul Puri ,  Robert Schmidt

Inventor： Barin Haskell ,  Atul Puri ,  Robert Schmidt

IPC: H04N11/04 ,  H04N7/12 ,  H04B1/66 ,  H04N11/02

CPC classification number: H04N19/649 ,  H04N19/527 ,  H04N19/86

Abstract: A video encoding method and apparatus is shown wherein image information is represented as a plurality of pixels, the pixels are organized into blocks, pixels transposition is performed on image information at the boundaries of the blocks, the blocks are transform coded and quantized. Pixel transposition involves transposition of alternate pixels at the boundaries of blocks with pixels of neighboring blocks found in a pre-determined direction. The pre-determined direction may be fixed by a system or may be applied on an image by image basis. In the event that the pre-determined direction is not established by a system, a pixel transposition circuit includes a transposition keyword in the output bit stream which is used by a decoded to determine the direction of pixel transposition.

公开(公告)号：US20060002467A1

公开(公告)日：2006-01-05

申请号：US11170622

申请日：2005-06-29

Applicant: Barin Haskell ,  Atul Puri ,  Robert Schmidt

Inventor： Barin Haskell ,  Atul Puri ,  Robert Schmidt

IPC: H04B1/66 ,  H04N11/02 ,  H04N11/04 ,  H04N7/12

CPC classification number: H04N19/126 ,  H04N19/124 ,  H04N19/176 ,  H04N19/61

Abstract: A quantizer and dequantizer for use in a video coding system that applies non linear, piece-wise linear scaling functions to video information signals based on a value of a variable quantization parameter. The quantizer and dequantizer apply different non linear, piece-wise linear scaling functions to a DC luminance signal, a DC chrominance signal and an AC chrominance signal. A code for reporting updates of the value of the quantization parameter is interpreted to require larger changes when the quantization parameter initially is large and smaller changes when the quantization parameter initially is small.

公开(公告)号：US20050243099A1

公开(公告)日：2005-11-03

申请号：US11179701

申请日：2005-07-12

Applicant: Adriana Dumitras ,  Barin Haskell

Inventor： Adriana Dumitras ,  Barin Haskell

IPC: G06T5/00 ,  G06T7/40 ,  G06T11/00 ,  H04N5/262 ,  H04N7/26 ,  G09G5/00

CPC classification number: G06T11/001 ,  G06T7/40 ,  G06T7/41 ,  G06T9/00 ,  G06T9/001 ,  H04N19/14 ,  H04N19/167 ,  H04N19/17 ,  H04N19/186 ,  H04N19/23 ,  H04N19/27

Abstract: Systems and methods for reducing bit rates by replacing original texture in a video sequence with synthesized texture. Reducing the bit rate of the video sequence begins by identifying and removing selected texture from frames in a video sequence. The removed texture is analyzed to generate texture parameters. New texture is synthesized using the texture parameters in combination with a set of constraints. Then, the newly synthesized texture is mapped back into the frames of the video sequence from which the original texture was removed. The resulting frames are then encoded. The bit rate of the video sequence with the synthesized texture is less than the bit rate of the video sequence with the original texture. Also, the ability of a decoder to decode the new video sequence is not compromised because no assumptions are made about the texture synthesis capabilities of the decoder.

Abstract translation: 通过用合成纹理替换视频序列中的原始纹理来降低比特率的系统和方法。 通过从视频序列中的帧识别和去除所选纹理，降低视频序列的比特率。 分析去除的纹理以生成纹理参数。 使用纹理参数和一组约束组合新的纹理。 然后，将新合成的纹理映射回去除原始纹理的视频序列的帧。 然后对所得到的帧进行编码。 具有合成纹理的视频序列的比特率小于具有原始纹理的视频序列的比特率。 此外，解码器解码新视频序列的能力不会受到损害，因为没有对解码器的纹理合成能力做出假设。

公开(公告)号：US20050175091A1

公开(公告)日：2005-08-11

申请号：US10811982

申请日：2004-03-30

Applicant: Atul Puri ,  Barin Haskell ,  Adriana Dumitras ,  James Normile ,  Hsi-Jung Wu ,  Xiaochun Nie

Inventor： Atul Puri ,  Barin Haskell ,  Adriana Dumitras ,  James Normile ,  Hsi-Jung Wu ,  Xiaochun Nie

IPC: H04N7/12 ,  H04N7/26 ,  H04N7/36 ,  H04N7/46 ,  H04N7/50

CPC classification number: H04N19/198 ,  H04N19/115 ,  H04N19/124 ,  H04N19/132 ,  H04N19/137 ,  H04N19/14 ,  H04N19/149 ,  H04N19/159 ,  H04N19/169 ,  H04N19/172 ,  H04N19/18 ,  H04N19/194 ,  H04N19/196 ,  H04N19/51 ,  H04N19/59 ,  H04N19/61

Abstract: A rate control system is disclosed for video coding applications. The rate controller assigns a quantization parameter for video data in a picture in response to complexity indicators indicative of spatial complexity, motion complexity and/or bits per pel of the picture. A virtual buffer based quantizer parameter is proposed based on a virtual buffer fullness analysis and a target rate estimate, which is derived from the complexity indicators. A second quantizer parameter is proposed from a linear regression analysis of quantizer parameters used to code previously coded pictures of similar type (e.g., I pictures, P pictures or B pictures). A coding policy decision unit defines a final quantizer parameter from a comparison of the two proposed quantizer parameters.

Abstract translation: 公开了一种用于视频编码应用的速率控制系统。 速率控制器响应于表示图像的空间复杂度，运动复杂度和/或每像素的复杂度指示符，为图像中的视频数据分配量化参数。 基于虚拟缓冲区丰满度分析和目标速率估计提出了一种基于虚拟缓冲器的量化器参数，该参数是从复杂性指标中得出的。 从用于对先前编码的类似类型的图像（例如，I图像，P图像或B图像）进行编码的量化器参数的线性回归分析提出了第二量化参数。 编码策略决定单元根据两个提出的量化器参数的比较来定义最终的量化器参数。