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Image encoding method, image decoding method, image encoding device and image decoding device

A technology of image encoding and image decoding, applied in the field of image decoding devices

Inactive Publication Date: 2014-04-30
KK TOSHIBA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Accordingly, so-called memory bandwidth, which is a bottleneck in encoding and decoding operations, becomes a problem when the amount of access to memory increases

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  • Image encoding method, image decoding method, image encoding device and image decoding device
  • Image encoding method, image decoding method, image encoding device and image decoding device
  • Image encoding method, image decoding method, image encoding device and image decoding device

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Embodiment Construction

[0028] Preferred embodiments of an image encoding method, an image decoding method, an image encoding device, and an image decoding device according to the present invention will be described in detail below with reference to the accompanying drawings.

[0029] The image encoding device and the image decoding device according to the present embodiment perform control by referring to color format information so that the position of a pixel indicated by a motion vector in a block having a size smaller than a predetermined size does not undergo interpolation for color difference, thereby reducing memory bandwidth.

[0030] figure 1 is a block diagram showing one example of the configuration of the image encoding device 100 according to the present embodiment. Such as figure 1 As shown in , the image encoding device 100 includes a subtraction unit 102, a transform / quantization unit 103, an inverse quantization / inverse transform unit 104, an entropy encoding unit 105, an addition...

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Abstract

In the present invention, memory bandwidth is reduced when encoding an image. An image encoding method includes an obtaining step and a generation step. In the obtaining step, a reference image is obtained. In the generation step, interpolation processing in accordance with a motion vector is carried out on the reference image for every luminance component and color difference component, and a prediction image having greater resolution than the reference image is generated. Further, in the generation step, in a case where the size of a block designated as the unit of interpolation processing is smaller than a pre-decided threshold value, a prediction image for a color difference component is generated without carrying out specific interpolation processing indicating interpolation processing in which the number of pixels accessed by a reference image is large.

Description

technical field [0001] Embodiments of the present invention relate to an image encoding method, an image decoding method, an image encoding device, and an image decoding device. Background technique [0002] In the art of video encoding and decoding, motion compensated interpolation for each block is generally performed. An image signal to be referred to is stored in an external memory; therefore, when video encoding and decoding are realized by hardware, there may be constraints on the amount of read data. Accordingly, so-called memory bandwidth, which is a bottleneck in encoding and decoding operations, becomes a problem when the amount of access to memory increases. [0003] In motion compensation interpolation for each tile, interpolation filtering processing using an FIR (Finite Impulse Response) filter in the horizontal direction and in the vertical direction is performed. In the interpolation filtering process, it is necessary to access pixels outside the block. As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/186H04N19/59H04N19/117
CPCH04N19/00066G06T7/2013H04N19/00315G06T9/004H04N19/00684H04N19/00672H04N19/00739H04N19/00757H04N19/44H04N19/117H04N19/136H04N19/137H04N19/186H04N19/513H04N19/52H04N19/523H04N19/59H04N19/567H04N19/105H04N19/17H04N19/50
Inventor 中條健山影朋夫
Owner KK TOSHIBA
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