公开(公告)号：EP0800677B1

公开(公告)日：2003-10-01

申请号：EP96929880.1

申请日：1996-08-27

Applicant: MOTOROLA, INC.

Inventor： BANHAM, Mark, R. ,  BRAILEAN, James, C. ,  LEVINE, Stephen, N. ,  KATSAGGELOS, Aggelos, K. ,  SCHUSTER, Guido, M.

IPC: G06T9/00

CPC classification number: G06T9/00

Abstract: A method (100, 200), device (300) and microprocessor (400) are provided for selectively compressing video frames of a motion compensated prediction-based viedo codec based on a predetermined set of compression techniques. An energy estimate of the currrent displaced frame difference, DFD, is used to compute a ratio between the estimate and a historical mean of energy estimates. The ratio is iteratively compared to a predetermined set of thresholds which are associated with the predetermined set of compression techniques. The comparisons are used to choose a technique based on teh thresholds, and a technique is selected to be used for encoding the current DFD.

公开(公告)号：EP0800677A1

公开(公告)日：1997-10-15

申请号：EP96929880.0

申请日：1996-08-27

Applicant: MOTOROLA, INC.

Inventor： BANHAM, Mark, R. ,  BRAILEAN, James, C. ,  LEVINE, Stephen, N. ,  KATSAGGELOS, Aggelos, K. ,  SCHUSTER, Guido, M.

IPC: G06T9

CPC classification number: G06T9/00

Abstract: A method (100, 200), device (300) and microprocessor (400) are provided for selectively compressing video frames of a motion compensated prediction-based viedo codec based on a predetermined set of compression techniques. An energy estimate of the currrent displaced frame difference, DFD, is used to compute a ratio between the estimate and a historical mean of energy estimates. The ratio is iteratively compared to a predetermined set of thresholds which are associated with the predetermined set of compression techniques. The comparisons are used to choose a technique based on teh thresholds, and a technique is selected to be used for encoding the current DFD.

公开(公告)号：EP0800684A1

公开(公告)日：1997-10-15

申请号：EP96929873.0

申请日：1996-08-27

Applicant: MOTOROLA, INC.

Inventor： BANHAM, Mark, R. ,  BRAILEAN, James, C. ,  LEVINE, Stephen, N. ,  O'CONNELL, Kevin, J. ,  KATSAGGELOS, Aggelos, K.

IPC: G06T9 ,  H04N7 ,  H04N11

CPC classification number: H04N11/042 ,  H04N19/503

Abstract: The present invention provides a method (100, 700), device (400, 800) and microprocessor (500) for performing a computationally efficient iterative expansion of a displaced frame difference, DFD, image over a predetermined dictionary of modulated Gaussian functions for the purposes of video compression. The iterative expansion described in this invention decomposes the DFD image into a set of coefficients which represent the perceptually important areas of a video frame in a compact way. The resulting method, device and microprocessor serve to provide a means for very low bit rate coding/decoding of a video sequence.

公开(公告)号：EP0792488A1

公开(公告)日：1997-09-03

申请号：EP96914770.0

申请日：1996-05-24

Applicant: MOTOROLA, INC.

Inventor： OZCELIK, Taner, Building 16 ,  BRAILEAN, James, C. ,  KATSAGGELOS, Aggelos, K.

IPC: H04N7

CPC classification number: H04N19/543

Abstract: The present invention provides a method (300) and apparatus (100) for regenerating a dense motion vector field, which describes the motion between two temporally adjacent frames of a video sequence, utilizing a previous dense motion vector field. In this method, a spatial DVF and a temporal DVF are determined (302 and 304) and summed to provide a DVF prediction (306). This method and apparatus enables a dense motion vector field to be used in the encoding and decoding process of a video sequence. This is very important since a dense motion vector field provides a much higher quality prediction of the current frame as compared to the standard block matching motion estimation techniques. The problem to date with utilizing a dense motion vector field is that the information contained in a dense motion field is too large to transmit. The present invention eliminates the need to transmit any motion information.

公开(公告)号：EP0792489A1

公开(公告)日：1997-09-03

申请号：EP96919374.0

申请日：1996-06-12

Applicant: MOTOROLA, INC.

Inventor： OZCELIK, Taner ,  BRAILEAN, James, C. ,  KATSAGGELOS, Aggelos, K.

IPC: H04N7

CPC classification number: H04N19/537 ,  H04N19/20 ,  H04N19/503

Abstract: The present invention provides a method (600) and system (100) for predicting a differential vector field. The method and system enable the detection and encoding of an area where motion compensating the past image frame to the current image frame, fails. Based on the DFD signal, the present invention detects regions where the motion compensation has failed (102). The boundaries of these regions are encoded and sent to the decoder (104). The intensity values contained in this region, by the current intensity frame, are also encoded and sent to the decoder. Based on the decoded region boundaries, the decoder decodes the intensity values and places them into the correct regions.

公开(公告)号：EP0791270A1

公开(公告)日：1997-08-27

申请号：EP96921551.0

申请日：1996-06-12

Applicant: MOTOROLA, INC.

Inventor： OZCELIK, Taner ,  BRAILEAN, James, C. ,  KATSAGGELOS, Aggelos, K. ,  ERDOGAN, Ozan ,  AUYEUNG, Cheung

IPC: H04N5 ,  H04N7

CPC classification number: H04N19/80 ,  H04N5/21

Abstract: The present invention provides a method (200) and an apparatus (100) for spatially adaptive filtering for video encoding. The apparatus filters a video sequence prior the encoding process. The apparatus comprises a noise variance determiner (102), a local variance determiner (104), a noise visibility function determiner (106), a Gaussian kernel determiner (108), and a convolver (110). The apparatus removes noise directly from a Displaced Frame Difference, DFD, signal. This novel approach removes noise and miscellaneous high frequency components from the DFD signal without the introduction of the filtering artifacts characteristic of current techniques. By reducing the miscellaneous high frequency components, the present invention is capable of reducing the amount of information that must be encoded by the video encoder without substantially degrading the decoded video sequence.