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Apparatus and method for adaptively encoding pictures in accordance with information quantity of respective pictures and inter-picture correlation

  • US 5,883,672 A
  • Filed: 07/18/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 09/29/1994
  • Status: Expired due to Fees
First Claim
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1. Apparatus for adaptively encoding pictures in accordance with information quantity of respective pictures and inter-picture correlation, comprising:

  • a storage device for storing picture data of a plurality of input pictures to provide stored picture data;

    a picture information evaluator for evaluating the information quantity of said plurality of input pictures of said stored picture data to generate evaluated values of information quantity;

    an inter-picture correlation detector for detecting the correlation between pictures of said stored picture data to generate inter-picture correlation information;

    an orthogonal transformer for orthogonally transforming said stored picture data to generate orthogonal transform coefficients;

    a quantizer for quantizing the orthogonal transform coefficients using a pre-set quantization step size;

    a selector for adaptively selecting a compression method for each of said plurality of input pictures of said stored picture data as a function of said evaluated values of the information quantity and the inter-picture correlation information to provide a selected compression method; and

    a controller for predicting a basic quantization step size for said quantizer as a function of said evaluated values of the information quantity and an estimated quantity of compressed data from compressing one-picture picture data in accordance with said selected compression method;

    wherein said controller learns the relation between a quantization step size employed for compression, a post-compression data quantity and the evaluated values of information quantity to generate learning parameters and predicting the basic quantization step size for said quantizer as a function of said learning parameters.

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