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Signal transforming method, signal inversely-transforming method, image encoding apparatus, image encoding method, image decoding apparatus, image decoding method,
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A technology of image coding and inverse transformation, applied in the field of image decoding programs, can solve the problems of differential signal correlation (low degree, difficult to express differential signals, etc.), achieve high-efficiency coding, and improve the effect of energy concentration
Active Publication Date: 2009-09-23
NTT DOCOMO INC
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However, when the difference between the predicted signal obtained by intra-frame prediction or inter-frame prediction and the image signal to be encoded is taken out, the correlation (degree) of the difference signal is not high.
Therefore, it is difficult to express this differential signal compactly using DCT
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Embodiment 1
[0058] Refer below Figure 3 to Figure 15 Embodiment 1 of the present invention will be described.
[0059] image 3 A block diagram showing an image signal conversion device 300 that executes the first implementation method of the image signal conversion device according to the first embodiment. The image signal conversion device 300 has: input terminals 301-304; connection terminals 305-308; output terminals 309-312; subtractors 317, 322, 327, 334; adders 321, 326, 333, 338; 319, 323, 324, 329, 330, 335, 336; multipliers 320, 325, 328, 331, 332, 337. These subtractors, adders, and multipliers correspond to configurations that execute the first calculation processing or the second calculation processing described in the claims.
[0060] Regarding the image signal converting apparatus 300 constructed as above, the operation thereof will be described below. The image signal conversion device 300 consists of Figure 5 An image signal 501 composed of 4x4 pixels is shown as i...
Embodiment 2
[0088] Next, the image signal converting apparatus of Embodiment 2 will be described with reference to the drawings.
[0089] Figure 16 It is a figure showing the structure of the image signal conversion apparatus of this invention. The image signal conversion device 300A of the present embodiment has: input terminals 301-304; connection terminals 305-308; output terminals 309-312; subtractors 317, 322, 327, 334; adders 321, 326, 333, 338; Weighters 318A, 323A, 329A, 335A; Multipliers 320, 325, 328, 332, 337. The constituent elements are connected by a bus so as to be able to input and output signals to each other.
[0090] The image signal conversion device 300A converts the Figure 5 An image signal 501 composed of 4x4 pixels is shown as input. exist Figure 5 In , each grid corresponds to 1 pixel. The following describes a column of signals composed of 4 pixels, that is, Figure 5 The pixels 502~505 of are used as input 1D transformation, but it can be used for Fi...
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Abstract
PROBLEM TO BE SOLVED: To concentrate energy of signals to efficiently represent signals even in the case that correlations of signals being a conversion object are not high. SOLUTION: One embodiment of an image signalconversion method is a method of generating one or more conversion samples from a plurality of input samples and includes a first conversion sample generation step wherein at least one first input sample (an input sample from a terminal 304) out of a plurality of first input samples for use in generation of first conversion samples is subjected to first filtering processing in a filter 318 to generate first filter data and another first input sample (an input sample from a terminal 301) which is not used for generation of the first filter data and the generated first filter data are subjected to first arithmetic processing (subtraction in a subtractor 317) to generate first conversion samples.
Description
technical field [0001] The present invention relates to an image signalconversion method, an image signal inverse conversion method, an image encoding device, an image encoding method, an image encoding program, an image decoding device, an image decoding method, and an image decoding program. Background technique [0002] Conventionally, compression coding techniques have been used to efficiently transmit or store still image or moving image data. In particular, for moving images, MPEG (Moving Picture Experts Group) 1, 2, 4 or H.261 to H.264 are used, and for still images, JPEG (Joint Photographic Experts Group) or JPEG2000 is used. [0003] In these coding methods, the image to be coded is divided into multiple blocks, and discrete cosine transform (hereinafter referred to as "DCT") is used to transform each block itself or the prediction signal corresponding to these blocks with the difference signal of the block. into the frequency domain. By quantizing the converted ...
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