Video data compression apparatus for recording and reproducing compressed video data at their various compressed data rates
First Claim
1. Apparatus for real time recording of uncompressed video data having a constant uncompressed data rate, said apparatus comprising:
- compressing means for compressing said uncompressed video data and responsive to a compression control parameter for varying said constant uncompressed data rate to form compressed video data having unregulated varying compressed data rates, said compression control parameter being varied to maintain a constant level of picture quality during compression of said uncompressed video data;
adjusting means for adjusting said compression control parameter in response to a user input whereby the user may balance the picture quality against a recording capacity requirement of said uncompressed video data on a recording medium; and
storing means for storing said compressed video data on said recording medium at said varying compressed data rates.
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Accused Products
Abstract
Apparatus for recording and reproducing video data is described that utilizes data compression to increase storage capacity. Real time input video data is decorrelated, quantized and entropy encoded. User control of a compression control parameter, such as quantization step width, is provided so that the user can adjust the loss of fidelity through compression to a desired level. The compressed data is output to a storage RAM 38 at an unregulated varying data rate. The system allows real time storage of video data in a manner in which the loss of fidelity is held constant and the amount of storage capacity required for particular sections of input video data varies with the information content of that input video data.
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Citations
16 Claims
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1. Apparatus for real time recording of uncompressed video data having a constant uncompressed data rate, said apparatus comprising:
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compressing means for compressing said uncompressed video data and responsive to a compression control parameter for varying said constant uncompressed data rate to form compressed video data having unregulated varying compressed data rates, said compression control parameter being varied to maintain a constant level of picture quality during compression of said uncompressed video data; adjusting means for adjusting said compression control parameter in response to a user input whereby the user may balance the picture quality against a recording capacity requirement of said uncompressed video data on a recording medium; and storing means for storing said compressed video data on said recording medium at said varying compressed data rates. - View Dependent Claims (2, 3, 4, 12)
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8. Apparatus for real time recording and reproducing of uncompressed video data having a constant uncompressed data rate, said apparatus comprising:
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compressing means for compressing said uncompressed video data and responsive to a compression control parameter for varying said constant uncompressed data rate to form compressed video data having unregulated varying compressed data rates, said compression control parameter being varied to maintain a constant level of picture quality during compression of said uncompressed video data; adjusting means for adjusting said compression control parameter in response to a user input whereby the user may balance the picture quality against a recording capacity requirement of said uncompressed video data on a recording medium; storing means for storing said compressed video data and said compression control parameter on said recording medium at said varying compressed data rates; reading means for reading said compressed video data and said compression control parameter from said storing means at said varying compressed data rates; and decompressing means responsive to the read compression control parameter for decompressing said compressed video data and modifying said varying compressed data rates to form said uncompressed video data having said constant uncompressed data rate. - View Dependent Claims (5, 6, 7, 9, 10, 11, 13, 14)
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15. Method for real time recording of uncompressed video data having a constant uncompressed data rate comprising the steps of:
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compressing said uncompressed video data and varying said constant uncompressed data rate in response to a compression control parameter to form compressed video data having unregulated varying compressed data rates, said compression control parameter being varied to maintain a constant level of picture quality during compression of said uncompressed video data; adjusting said compression control parameter in response to a user input, whereby the user may balance a loss in picture quality against a recording capacity requirement of said uncompressed video data on a recording medium; and storing said compressed video data on said recording medium at said varying compressed data rates.
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16. Method for real time recording and reproducing of uncompressed video data having a constant uncompressed data rate, comprising the steps of:
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compressing said uncompressed video data and varying said constant uncompressed data rate in response to a compression control parameter to form compressed video data having unregulated varying compressed data rates, said compression control parameter being varied to maintain a constant level of picture quality during compression of said uncompressed video data; adjusting said compression control parameter in response to a user input whereby the user may balance the picture quality against a recording capacity requirement of said uncompressed video data on a recording medium; storing said compressed video data and said compression control parameter on said recording medium at said varying compressed data rates; reading said compressed video data and said compression control parameter from said storing means at said varying compressed data rates; and decompressing said compressed video data in response to the read compression control parameter and modifying said varying compressed data rates to form said uncompressed video data having said constant uncompressed data rate.
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Specification