Motion picture coding method and apparatus
A technology for moving images and coding equipment, which is applied in the field of moving image coding and can solve problems such as reducing the capacity of image memory
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no. 1 example
[0061] figure 1 is a block diagram showing the configuration of the moving image encoding device according to the first embodiment of the present invention. This moving image encoding device includes an encoder that performs compression encoding of moving images, a decoder that decodes encoded data to present moving images, a CPU 131 that controls the entire apparatus, and the like.
[0062] exist figure 1 In the encoder shown, reference numeral 101 represents an image input part, reference numeral 103 represents a DCT part that performs orthogonal transformation, reference numeral 104 represents a quantization part, reference numeral 105 represents a variable-length coding part that performs compression coding, and reference numeral 106 represents an inverse quantization part , Reference numeral 107 denotes an inverse DCT section performing inverse orthogonal transform, reference numeral 108 denotes a reference image memory, reference numeral 109 denotes a motion compensat...
no. 2 example
[0085] By further reducing the capacity of the reference image memories prepared in the first embodiment for encoding and decoding, wherein each reference image memory has a capacity of 1 / 2 frame size, it is possible to use the vacant memory area for other use. Figure 5 is a view for describing the usage method of the reference image memory and the audio memory in the second embodiment. The present embodiment performs control in such a manner that the capacity of the reference image memory is further reduced to less than 1 / 2 frame size, and uses the memory area thus made vacant as the audio memory space.
[0086] refer to Figure 5 , Reference numeral 321 represents the audio memory of the encoder used to encode the audio in the local station, reference numeral 322 represents the audio memory of the decoder used to decode the audio in the local station, and reference numeral 323 represents the audio memory used in the remote station The audio memory of the decoder that deco...
no. 3 example
[0097] Even under communication conditions in which image quality is deteriorated by sharing the reference image memory prepared in the first embodiment for encoding and decoding between an encoder and a decoder according to circumstances, each of which is With a capacity of 1 / 2 frame size, it is also possible to utilize a reference image memory having a limited capacity in order to improve image quality.
[0098] In the third embodiment, in order to allow the encoder and decoder to share the reference picture memory on a case-by-case basis, the local station and the remote station use figure 2 The encoding method of the user region shown here exchanges requests and authorization responses to share reference image memory. Figure 6A to Figure 9 is a view for illustrating the usage method of the reference image memory in the third embodiment.
[0099] 6A to 6C show that when the user judges that it is necessary to improve the image quality of the image to be transmitted from...
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