Image processing method and apparatus
First Claim
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1. An image processing method comprising the steps of:
- inputting coded image data and a coding parameter for use in processing the coded image data, wherein the coding parameter includes a quantizing parameter and is transmitted together with the coded image data;
decoding the coded image data to produce decoded image data in accordance with the coding parameter;
estimating a deterioration factor based on the coding parameter;
selecting a suitable correction parameter in accordance with the deterioration factor; and
correcting the decoded image data in accordance with the correction parameter.
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Abstract
In coding color still image data into multi-valued image data, the image quality deteriorates when a large compression ratio is used. In the present invention, a transmitted image is classified using a parameter transmitted from the transmitting station, and the deterioration of image quality caused by compression at the transmitting station is estimated from the image classification. In an image reproduction, a quantization table is used in the case of an adaptive discrete cosine transform (ADCT) method to select an optimum neural network suitable for image reproduction and improve the image quality.
19 Citations
23 Claims
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1. An image processing method comprising the steps of:
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inputting coded image data and a coding parameter for use in processing the coded image data, wherein the coding parameter includes a quantizing parameter and is transmitted together with the coded image data; decoding the coded image data to produce decoded image data in accordance with the coding parameter; estimating a deterioration factor based on the coding parameter; selecting a suitable correction parameter in accordance with the deterioration factor; and correcting the decoded image data in accordance with the correction parameter. - View Dependent Claims (2, 3, 4, 5, 6, 8)
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7. An image processing method comprising the steps of:
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discriminating at a receiving station characteristics of coded image data transmitted from a transmitting station, including a deterioration factor of the coded image data, in accordance with a quantization table representing quantization characteristics or a Huffman coding table transmitted from the transmitting station, wherein the quantization table is transmitted together with the coded image data; and determining an image correcting method to be used after the coded image data is decoded at the receiving station, in accordance with the discriminated characteristics, wherein the image correcting method selects suitable correction parameters to correct the decoded image data. - View Dependent Claims (10, 11, 12, 14)
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9. An image processing apparatus comprising:
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inputting means for inputting coded image data and a coding parameter for use in processing the coded image data, wherein the coding parameter includes a quantizing parameter and is transmitted together with the coded image data; decoding means for decoding the coded image data to produce decoded image data in accordance with the coding parameter; estimating means for estimating a deterioration factor based on the coding parameter; selecting means for selecting a suitable correction parameter in accordance with the deterioration factor; and correcting means for correcting the decoded image data in accordance with the correction parameter. - View Dependent Claims (13, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification