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公开(公告)号：US3632865A
公开(公告)日：1972-01-04
申请号：US3632865D
申请日：1969-12-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： HASKELL BARIN G , LIMB JOHN O
Abstract: In an encoding system for use with video signals, the velocity of a subject between two frames is estimated and used to predict the location of the subject in a succeeding frame. Differential encoding between this prediction and the actual succeeding frame are used to update the prediction at the receiver. As only the velocity and the updating difference information need be transmitted, this provides a reduction in the communication channel capacity required for video transmission. The scheme may be implemented by comparing the intensities of points in consecutive frames, identifying those points having a significant frame to frame intensity difference as part of the moving subject, determining an estimated velocity of the identified subject, predicting the present frame by translating a portion of the previous frame by the estimated velocity (the translated portion forming the identified subject), and transmitting the updating difference between the actual and predicted present frames along with the predictive velocity information.
Abstract translation: 在与视频信号一起使用的编码系统中，估计两帧之间的对象的速度并用于预测被摄体在接下来的帧中的位置。 该预测与实际的后续帧之间的差分编码用于更新接收机处的预测。 由于仅需要发送速度和更新差异信息，所以这降低了视频传输所需的通信信道容量。 该方案可以通过将连续帧中的点的强度进行比较来实现，将具有有效帧的那些点与帧强度差作为移动对象的一部分，确定所识别的对象的估计速度，通过翻译部分 （被形成识别对象的翻译部分），以及预测速度信息之间传送实际和预测的当前帧之间的更新差异。
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2.发明授权
公开(公告)号：US3609552A
公开(公告)日：1971-09-28
申请号：US3609552D
申请日：1969-08-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： LIMB JOHN O , MOUNTS FRANK W
CPC classification number: H03M3/04
Abstract: A differential pulse code communication system is disclosed which digitally accumulates the difference signal in order to eliminate the matching problem inherent in prior art systems. In the transmitter the difference signals are digitally accumulated and converted to analog form for subtraction from the input signal, and at the receiver the difference signal is accumulated before it is converted to analog form to reconstruct the input signal.
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公开(公告)号：US3593141A
公开(公告)日：1971-07-13
申请号：US3593141D
申请日：1969-09-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： BROWN EARL F , KAMINSKI WILLIAM , LIMB JOHN O , MOUNTS FRANK W
CPC classification number: H03M3/04
Abstract: A differential pulse code communication system is disclosed with sign prediction coding which reduces the number of digits required to describe the levels produced in the quantization of the differential signal. In the system the sign of the largest positive and negative levels of the quantizer are predicted by assuming that they have the same sign as the previous level. If the prediction is wrong a lower level with the correct sign is transmitted rather than the level with the predicted sign. Because of the prediction, additional levels may be added in the quantizer in the space otherwise reserved for the signs predicted without increasing the pulse rate of the system.
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