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Image decoding device, image encoding device, and coded data conversion device

A technology for encoding data and image decoding, which is applied in image communication, digital video signal modification, electrical components, etc., and can solve problems such as reduced prediction accuracy

Active Publication Date: 2019-02-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In the video application software considering the region of interest as described above, when high-level and low-level coded data including the region of interest are generated, the positional relationship between high-level pixels and low-level pixels changes, and as a result, high-level pixel values ​​are predicted from low-level pixel values When , the problem of reduced prediction accuracy occurs

Method used

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  • Image decoding device, image encoding device, and coded data conversion device
  • Image decoding device, image encoding device, and coded data conversion device
  • Image decoding device, image encoding device, and coded data conversion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0345] [Variation Example 1: Example of Other Ratio Correction Information]

[0346] In the above description of the layered video decoding device 1 , the calculation of the inter-layer ratio based on the following parameters included in the ratio correction information has been described as an example.

[0347] · A2TL: Expand the upper left offset of the reference layer

[0348] · A2BR: Expand the bottom right of the reference layer to add an offset

[0349] A3WH: virtual reference layer size

[0350] It is also possible to decode a parameter different from the above from the parameter set as the scale correction information, and calculate the inter-layer scale based on the parameter. For example, the following parameters can be used.

[0351] · A4S: Alternative Interlayer Scale

[0352] · A4Sd: Alternative Layer Scale Difference

[0353] A5WH: the size of the area corresponding to the virtual reference layer

[0354] A5WHd: the difference in size of the area correspond...

Embodiment 1A

[0357] [Variation Example 1A: Alternative Layer Ratio]

[0358] The parameter set decoding unit 12 decodes scale correction information from the input target layer coded data. For example, the scale correction information is included in the SPS extension, which can be based on Figure 16 shown in the syntax table for decoding. Figure 16 It is a part related to the scale correction information in the syntax table that the parameter set decoding unit 12 refers to when decoding the SPS.

[0359] Alternative Interlayer Scale (A4S) is a parameter used for interlayer ratio calculation. In summary, the alternate interlayer ratio is used as the value of the direct interlayer ratio. The SPS includes the horizontal component (alt_scale_x[i]) and the vertical component (alt_scale_y[i]) of the alternative inter-layer scale corresponding to a specific reference layer as the alternative inter-layer scale. The subscript ([i]) of the array indicates which parameter in SPS. The inter-lay...

Embodiment 1B

[0376] [Variant Example 1B: Alternative Interlayer Ratio Difference]

[0377] The parameter set decoding unit 12 decodes scale correction information from the input target layer coded data. Scale correction information, e.g. contained in the SPS extension, is available according to e.g. Figure 17 shown in the syntax table for decoding. Figure 17 It is a part related to the scale correction information in the syntax table that the parameter set decoding unit 12 refers to when decoding the SPS.

[0378] Alternative Interlayer Scale Difference (A4Sd) is a parameter used for interlayer scale calculations. In a nutshell, it is to add the inter-layer ratio difference to the inter-layer ratio generated by the ratio of the reference layer size and the corresponding area size of the reference layer, and finally calculate the inter-layer ratio. As an alternative inter-level scale difference, the parameter set includes an alternative inter-level scale horizontal component difference...

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Abstract

A layered video decoding device (1) includes a parameter set decoder (12) for decoding scale correction information, and a predictive picture generator (1442) for generating a predictive picture based on the scale correction information.

Description

technical field [0001] The present invention relates to an image decoding device that decodes layered encoded data of a layered encoded image, and an image encoding device that generates layered encoded data by performing layered encoding on an image. Background technique [0002] Images or videos are one type of information transmitted by a communication system, or information recorded in a storage device. In the prior art, image coding techniques are known for transmission and storage of such images (also including videos hereinafter). [0003] AVC (H.264 / MPEG-4 Advanced Video Coding) and its subsequent codec HEVC (High-Efficiency Video Coding) (Non-Patent Document 1) are known video coding schemes. [0004] In these video coding methods, the prediction image is usually generated based on the local decoded image obtained by encoding / decoding the input image, and the prediction residual obtained by subtracting the prediction image from the input image (original image) (als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/33H04N19/132H04N19/157H04N19/172H04N19/70
CPCH04N19/70H04N19/17H04N19/187H04N19/167H04N19/33H04N19/59H04N19/105H04N19/182H04N19/51
Inventor 山本智幸猪饲知宏筑波健史
Owner HUAWEI TECH CO LTD
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