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Video data compression system, video recording/playback system, and video data compression encoding method
| Details |
Inventors: Ono, Koichi; Nishijima, Hideo; Kanesaki, Takayuki; Horiuchi, Tadasu; Tsukiji, Nobuyoshi;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Kelley; Chris
Assistant Examiner: Wong; Allen
Attorney, Agent or Firm: Mattingly, Stanger & Malur, P.C.
A video data compression/playback system efficiently compresses a plurality of video data pieces through inter-frame predictive-encoding. Mixed video data VSMIr composed of time-divided video data received by video input terminals are divided video data pieces each of which corresponding to video input terminals and the video data pieces are written into memories respectively by a memory control circuit for recording mode. The mixed video data written into the memories is read, a specified number of frames at a time. An MPEG encoding circuit performs inter-frame predictive-encoding for each specified number of frames. |
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DETAILED DESCRIPTION Time lapse VTRs, which record analog video signals on magnetic tapes, have been used in most conventional video surveillance systems.
It is also possible to configure a video surveillance system using digital recording system explained above.
That is, a system with only one camera digitizes the output video signals, reduces the amount of data by compressing data with MPEG, and records compressed data on a disk or tape.
A system with multiple cameras has an MPEG compression unit and a recording/playback unit installed for each camera to record digitized video signals sent from each camera.
The problem is that a video surveillance system with multiple MPEG compression encoding units is very expensive because the MPEG compression encoding unit is very expensive.
It is therefore preferable that, as with the conventional video surveillance system, the system has only one compression encoding unit which compresses video signals sent from multiple cameras for recording.
However, compressing digitized mixed video signals generated by a frame switcher with MPEG poses the following problem.
In most cases, video generated by separate cameras has no correlation.
This means that the amount of changes among video obtained by separate cameras is much larger than the amount of changes among video obtained by the same camera.
Therefore, a frequent switch among multiple cameras in the time divided manner affects inter-frame predictive encoding.
Video data cannot be compressed efficiently for recording.
This invention seeks to solve the problems associated with the prior art described above.
It is an object of this invention is to provide a video data compression system, video recording/playback system, and video data compression encoding method which efficiently compress multiple video data items through predictive encoding.
To solve the above problems, a first embodiment of this invention is a video data compression system which compresses mixed video data generated by mixing a plurality of video data items in a time-divided manner, wherein the mixed video data is compressed by performing inter-frame or inter-field predictive encoding for each of the plurality of video data items
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TV Signal 
