Method and apparatus for coding and recording an image signal and recording medium for storing an image signal
First Claim
1. A coding apparatus for coding an image signal, comprising:
- means for receiving a low resolution image signal consisting of a plurality of pixels as well as a high resolution image signal consisting of a plurality of pixels, said high resolution image signal having a higher resolution than said low resolution image signal;
first coding means for coding said low resolution image signal;
predicting means for predicting said high resolution image signal from said low resolution image signal thereby generating a predicted high resolution image signal;
judgement means for dividing said predicted high resolution image signal into a plurality of blocks each including n×
m pixels, and then detecting a pre-determined feature of each block and finally outputting a judgement code corresponding to said feature; and
second coding means for selecting a coding table in accordance with said judgement code and then coding the n×
m pixels in the corresponding block of said high resolution image signal using said selected coding table.
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Abstract
A method and apparatus for coding and decoding an image signal, and also a recording medium for storing a coded image signal wherein low resolution image signal including a plurality of pixels and also a high resolution image signal including a plurality of pixels are received. The low resolution image signal is coded thereby generating a resultant coded low resolution image signal. The high resolution image signal is predicted from the low resolution image signal thereby generating a predicted high resolution image signal. After that, the predicted high resolution image signal is divided into a plurality of blocks each including n×m pixels. The feature of each block is detected and a judgement code corresponding to the detected feature is generated. Then a coding table is selected in accordance with the judgement code. The n×m pixels in the corresponding block of the high resolution image signal are coded using the selected coding table to generate coded data. In the above process, instead of directly coding the high resolution image signal, the difference between the high resolution image signal and the predicted high resolution image may be coded. The image signal can be compressed in a highly efficient fashion by coding the low resolution image signal and high resolution image signal.
73 Citations
34 Claims
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1. A coding apparatus for coding an image signal, comprising:
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means for receiving a low resolution image signal consisting of a plurality of pixels as well as a high resolution image signal consisting of a plurality of pixels, said high resolution image signal having a higher resolution than said low resolution image signal; first coding means for coding said low resolution image signal; predicting means for predicting said high resolution image signal from said low resolution image signal thereby generating a predicted high resolution image signal; judgement means for dividing said predicted high resolution image signal into a plurality of blocks each including n×
m pixels, and then detecting a pre-determined feature of each block and finally outputting a judgement code corresponding to said feature; andsecond coding means for selecting a coding table in accordance with said judgement code and then coding the n×
m pixels in the corresponding block of said high resolution image signal using said selected coding table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of coding an image signal, comprising:
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the step of receiving a low resolution image signal consisting of a plurality of pixels as well as a high resolution image signal consisting of a plurality of pixels, said high resolution image signal having a higher resolution than said low resolution image signal; the first coding step of coding said low resolution image signal; the predicting step of predicting said high resolution image signal from said low resolution image signal thereby generating a predicted high resolution image signal; the detecting step of dividing said predicted high resolution image signal into a plurality of blocks each including n×
m pixels, and then detecting a predetermined feature of each block and finally outputting a judgement code corresponding to said feature; andthe second coding step of selecting a coding table in accordance with said judgement code and then coding the n×
m pixels in the corresponding block of said high resolution image signal using said selected coding table. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A decoding apparatus for decoding a coded data, said coded data including a coded low resolution image signal generated by coding a low resolution image signal and also including a coded high resolution image signal generated by coding a high resolution image signal, said decoding apparatus comprising:
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first decoding means for decoding said coded low resolution image signal thereby generating a decoded low resolution image signal; predicting means for predicting said high resolution image signal from said decoded low resolution image signal thereby generating said predicted high resolution image signal; judgement means for dividing said predicted high resolution image signal into a plurality of blocks each including n×
m pixels, and then detecting a predetermined feature of each block and finally outputting a judgement code corresponding to said feature; andsecond decoding means for selecting a coding table in accordance with said judgement code and then decoding said coded high resolution image signal using said selected coding table thereby generating a decoded high resolution image signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method of decoding a coded data, said coded data including a coded low resolution image signal generated by coding a low resolution image signal and also including a coded high resolution image signal generated by coding a high resolution image signal, said method comprising:
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the first decoding step of decoding said coded low resolution image signal thereby generating a decoded low resolution image signal; the predicting step of predicting said high resolution image signal from said decoded low resolution image signal thereby generating said predicted high resolution image signal; the detecting step of dividing said predicted high resolution image signal into a plurality of blocks each including n×
m pixels, and then detecting a predetermined feature of each block and finally outputting a judgement code corresponding to said feature; andsecond decoding means for selecting a coding table in accordance with said judgement code and then decoding said coded high resolution image signal using said selected coding table thereby generating a decoded high resolution image signal. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification