Showing papers on "Inter frame published in 1978"
Patent•
15 May 1978TL;DR: Error-correcting code theory is utilized in a video signal interframe coding system which requires no transmitter frame memory as discussed by the authors, where each of a plurality of n-bit words representing respective portions of the current frame is transformed into the corresponding k-bit syndrome of a selected (n,k) error correcting code.
Abstract: Error-correcting code theory is utilized in a video signal interframe coding system which requires no transmitter frame memory. In the transmitter, each of a plurality of n-bit words representing respective portions of the current frame is transformed into the corresponding k-bit syndrome of a selected (n,k) error-correcting code. As the syndrome of each word is received at the receiver, the corresponding word from the previous frame is read out of a receiver frame memory and its syndrome is formed. The received and formed syndromes are subtracted from one another and passed through an error-correcting code decoder. The previous-frame word is added to the decoder output, yielding the current-frame n-bit word.
35 citations
Patent•
06 Feb 1978
TL;DR: In this paper, the positive and negative polarities of chrominance signals at every other frame were inverted to suppress the increment of information due to chrominance signal by inverting the polarities at each other frame.
Abstract: PURPOSE:To interframe-encode color TV signals directly and suppress the increment of information due to chrominance signals by inverting the positive and negative polarities of chrominance signals at every other frame.
4 citations
07 Dec 1978
TL;DR: Four test images were processed as fields and as interlaced frames, using both theoretical and experimental compression designs, and field compression requires about one-half bit per sample more than frame compression for comparable mean-square error and subjective appearance.
Abstract: Because of the interlaced television scan, the two fields that form an interlaced video frame are generated 1/60 of a second apart. If the two fields are compressed independently, the correlation between adjacent lines is unused. The transmission rate can be reduced by using a field memory to form an interlaced frame. Four test images were processed as fields and as interlaced frames, using both theoretical and experimental compression designs. For comparable mean-square error and subjective appearance, field compression requires about one-half bit per sample more than frame compression. However, the overall transmission rate - the number of bits per image times the number of images per second - is more meaningful than the number of bits per sample. When transform compression at low transmission rates merges the adjacent lines, frame compression becomes similar to field repeating, and the memory can be reduced.
1 citations