摘要:
Systems and methods for the processing of images (Fig. 3B) over bandwidth-limited transmission interfaces, such as processing of high resolution video images over standard analog video interfaces, using multi-stream and/or multi-resolution analog methodology. The disclosed systems and methods may also be implemented to provide video resolutions across standard analog video interfaces in a manner that supports digital capture and imaging techniques to obtain useful information from digitally zoomed and enhanced video.
摘要:
Digital samples of an HDTV video signal are compressed by determining groups each of three successive samples in the video signal lines, the groups in adjacent lines being offset from one another, and transmitting only a first sample in each group (e.g. B in line n). Each of the second (P) and third (Q) samples in each group is compared with magnitudes averaged from three adjacent, transmitted, first samples (A, B or D, C), one in each of the previous, same, and following video signal lines, to determine a closest match. A 2-bit code representing this closest match is transmitted for each of these second and third samples in each group. The groups, and hence the first samples, are offset from one another in adjacent video signal lines, and the sampling frequency is desirably an odd multiple of half the video signal line frequency to offset the sampled pixels in adjacent video signal lines. The invention provides a high compression ratio, which can be further increased by DPCM encoding of the successive first samples.
摘要:
Ce système de transmission d'images utilisant un canal de transmission à bande passante relativement étroite comporte d'une part, un dispositif émetteur (1) pourvu d'un organe de prise de vues (2) prévu pour fournir N informations d'images complètes par une unité de temps, d'un premier organe de prélèvement (5) pour prélever des informations de transmission à partir des informations d'images complètes en vue de leur transmission via ledit canal de transmission et d'autre part, au moins un dispositif récepteur (10) pourvu d'un organe de reconstruction (14) pour fournir des informations d'images reconstruites à partir des informations de transmission. L'organe de prélèvement (5) est conçu pour prélever une image parmi N images fournies par l'organe de prise de vues (2) tandis que l'organe de reconstruction (14) est constitué à partir d'un organe d'interpolation temporelle pour interpoler les N-1 images non transmises à partir des images transmises. Application : télévision à haute définition.
摘要:
The subrange-type A/D converter includes A/D converters in multiple stages (204, 212), with their driving clock frequencies being in certain relationship so that they are used commonly for the A/D conversion of the high definition television signal and the A/D conversion of a test signal for detecting the transmission characteristics.