Apparatus and method for adaptively encoding pictures in accordance with information quantity of respective pictures and inter-picture correlation
First Claim
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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Abstract
A method and apparatus for encoding a picture with improved prediction accuracy in predicting the basic quantization step. The apparatus for encoding a picture includes a picture data storage unit, a picture information evaluating unit, an inter-picture correlation detection unit, an orthogonal transform unit for orthogonally transforming the picture data for generating orthogonal transform coefficients, a quantization unit for quantizing the orthogonal transform coefficients produced by the orthogonal transform unit at a pre-set quantization step, an adaptive compression method selection unit and a quantization step control unit. The information quantity is evaluated from stored picture data of plural pictures, and the inter-picture correlation is detected. A picture data compression method is adaptively selected based upon the evaluated value of the information quantity and the inter-picture correlation information. The basic quantization step is predicted from the evaluated value and a pre-set compressed data quantity obtained on compressing one-picture picture data by the selected compression method and the evaluated value.
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Citations
10 Claims
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1. Apparatus for adaptively encoding pictures in accordance with information quantity of respective pictures and inter-picture correlation, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. Method for adaptively encoding pictures in accordance with information quantity of respective pictures and inter-picture correlation, said method comprising the steps of:
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storing picture data of a plurality of input pictures to provide stored picture data; evaluating the information quantity of said plurality of input pictures of said stored picture data to generate evaluated values of information quantity; detecting the correlation between pictures of said stored picture data to generate inter-picture correlation information; orthogonally transforming said stored picture data to generate orthogonal transform coefficients; quantizing the orthogonal transform coefficients by use of a quantizer using a pre-set quantization step size; 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 predicting a basic quantization step size by use of a controller 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. - View Dependent Claims (7, 8, 9, 10)
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Specification