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Uniform granularity for quantization matrices in video decoding

A technology of quantization matrix and video decoding, which is applied in the field of video decoding and can solve the problems of low QP granularity and uneven QP granularity.

Inactive Publication Date: 2017-12-05
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using quantization matrix entries as scaling factors results in non-uniform QP granularity with lower QP granularity for smaller quantization matrix entries

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  • Uniform granularity for quantization matrices in video decoding
  • Uniform granularity for quantization matrices in video decoding
  • Uniform granularity for quantization matrices in video decoding

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Embodiment Construction

[0020] Video compression techniques generally include predictive reduction of a current block to be coded to a residual block, transforming pixel domain values ​​in the residual block to frequency domain transform coefficients, and quantizing the transform coefficients to further reduce bit rate. The degree of quantization may be modified by adjusting quantization parameter (QP) values ​​for transform coefficients of a video block. After quantization, the quantized transform coefficients are entropy encoded. The encoded bitstream may be transmitted to a video decoder, or archived for later transmission or retrieval by a video decoder. At the video encoder, the quantized transform coefficients are dequantized and inverse transformed to reconstruct video blocks for later use as reference blocks for reference pictures. At the video decoder, the quantized transform coefficients are decoded, dequantized, and inverse transformed from the received bitstream to reconstruct video bloc...

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Abstract

The techniques of this disclosure are directed to computing quantized and dequantized transform coefficients for video blocks at uniform QP granularity using modified quantization parameter QP values. Conventionally, when quantization matrices are used during quantization and dequantization of transform coefficients, the quantization matrix entries act as scaling factors for the quantizer step size corresponding to the base QP value, which results in non-uniform QP granularity. To provide uniform QP granularity across all quantization matrix entries, the techniques include calculating modified QP values ​​for transform coefficients based on associated quantization matrix entries used as offsets to a base QP value. At the video decoder, the techniques include calculating dequantized transform coefficients from quantized transform coefficients based on the modified QP value. At the video encoder, the techniques include calculating quantized transform coefficients from transform coefficients based on the modified QP value.

Description

[0001] This application claims the benefit of US Provisional Application Serial No. 61 / 624,959, filed April 16, 2012, which is hereby incorporated by reference in its entirety. technical field [0002] This disclosure relates to video coding, and more particularly, to video compression during video coding. Background technique [0003] Digital video capabilities can be incorporated into a wide variety of devices including digital televisions, digital direct broadcast systems, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, tablet computers, electronic Book readers, digital cameras, digital recording devices, digital media players, video game devices, video game consoles, cellular or satellite radiotelephones (so-called "smart phones"), video teleconferencing devices, video streaming devices and its analogues. Digital video devices implement video compression techniques such as the standards defined by MPEG-2, MPEG-4, ITU-T H.263 ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/18H04N19/126H04N19/176H04N19/467
CPCH04N19/126H04N19/176H04N19/18H04N19/46
Inventor 瑞珍·雷克斯曼·乔许霍埃尔·索赖 罗哈斯马尔塔·卡切维奇
Owner QUALCOMM INC