Showing papers on "Inter frame published in 1977"
TL;DR: In interframe coding the content of the frame memory can also be utilized for the prediction of the luminances of moving area picture elements (pels), provided that their displacement has been measured and transmitted.
Abstract: In interframe coding the content of the frame memory can also be utilized for the prediction of the luminances of moving area picture elements (pels), provided that their displacement has been measured and transmitted. After an analysis of methods for the optimal segmentation of the image into areas corresponding to background, translating objects, and areas not predictable from the previous frame, experimental results of the coding are given; it can be seen that the bit rates are about halved with respect to plain interframe coding.
58 citations
TL;DR: This paper describes several adaptive delta modulators designed to encode video signals and describes and illustrates the effect of large amounts of motion on the reconstructed picture.
Abstract: This paper describes several adaptive delta modulators designed to encode video signals. One- and two-dimensional ADM algorithms are discussed and compared. Results are shown for bit rates of 2 bits/pixel, 1 bit/pixel and 0.5 bits/pixel. Pictures showing the difference between the encodeddecoded pictures and the original pictures are presented. Results are also presented to illustrate the effect of channel errors on the reconstructed picture. A two-dimensional ADM using interframe encoding is also presented. This system operates at the rate of 2 bits/pixel and produces excellant quality pictures when there is little motion. We also describe and illustrate the effect of large amounts of motion on the reconstructed picture.
20 citations
08 Dec 1977
TL;DR: A conditional replenishment transform video compressor has been simulated in preparation for hardware design, which operates at a fixed rate and uses compressed frame memories at the transmitter and receiver.
Abstract: Most interframe video compression using transforms uses three-dimensional transforms or differential pulse code modulation (DPCM) between successive frames of two-dimensionally transformed video. Conditional replenishment work is nearly all based on DPCM of individual picture elements, although conditional replenishment of transform subpictures can take advantage of the predefined subpictures for addressing and can use the most significant transform vectors for change detection without decoding the compressed image. A conditional replenishment transform video compressor has been simulated in preparation for hardware design. The system operates at a fixed rate and uses compressed frame memories at the transmitter and receiver. Performance is a function of transmission rate and memory capacity and is dependent on the motion content of the compressed scene.© (1977) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
19 citations
TL;DR: A parallel search technique and a special purpose associative processor implementation which can eliminate loss of frame synchronization due to frame pattern bit errors and reduce frame synchronization time to its minimum value by eliminating the time spent dwelling at false frame positions is presented.
Abstract: Data loss resulting from the time to regain frame synchronization following detection of an out-of-frame condition on a synchronous time-division multiplexed bus or line, such as the Bell System T1 digital line, can be substantial. Most current sequential schemes require many frame times to separate with high probability the true frame pattern from identical patterns occurring temporarily in random data. A parallel search technique and a special purpose associative processor implementation which can eliminate loss of frame synchronization due to frame pattern bit errors and reduce frame synchronization time to its minimum value by eliminating the time spent dwelling at false frame positions is presented.
1 citations