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Video image transmission scheme based on gradient sampling information

A video image and gradient technology, applied in the field of visual transmission, can solve the problems of high energy and instability, and achieve the effect of good visual effect

Active Publication Date: 2017-02-15
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the compressed sensing measurements in the image pixel domain are directly transmitted in the wireless channel, it will require a lot of energy and is very unstable under the interference of noise.

Method used

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  • Video image transmission scheme based on gradient sampling information
  • Video image transmission scheme based on gradient sampling information
  • Video image transmission scheme based on gradient sampling information

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Embodiment Construction

[0035] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] Research on visual quality evaluation shows that human eyes are very sensitive to brightness jumps. Therefore, the present invention uses gradient data containing image brightness jump information as the main transmission object, and makes it as fidelity as possible to achieve better performance. Visual effects. In addition, since the gradient data belongs to the high-frequency components of the image, the low-frequency comp...

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Abstract

The invention discloses a video image transmission method which is used for transmitting visual information mainly depending on gradient sampling data under the assistance of a small amount of low frequency coefficients. The gradient sampling data are generated from gradient data by random projection. Compared with the manner of directly transmitting the gradient data, the manner of transmitting the gradient sampling data provided by the invention can obviously reduce the transmission data size, and can adapt to the situation that the channel bandwidth is insufficient. The video image transmission method disclosed by the invention not only has the advantages of having no cliff effect of SoftCast and being able to simultaneously serve a plurality of clients under different channel conditions, but also can achieve a better visual effect, and can adapt to different channel signal-to-noise ratios and bandwidth environments.

Description

technical field [0001] The present invention relates to the field of visual transmission, in particular to the field of wireless transmission of images / videos, and further relates to a scheme for wireless soft transmission of images / videos based on visual characteristics. Background technique [0002] Traditional digital image transmission schemes generally use pixel values ​​or DCT coefficients as transmission objects, such as figure 1 As shown, the input image undergoes transformation (T), quantization (Q), and variable length coding (VLC) to become a code stream, which is protected by forward error correction (FEC), and mapped to quadrature amplitude modulation (QAM) for orthogonal Frequency Division Multiplexing (OFDM) transmission. The encoding end needs to perform channel estimation to select an appropriate code rate. If the channel capacity is lower than a certain threshold, the performance of the decoding end will drop sharply; if it is higher than this threshold, ...

Claims

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Application Information

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IPC IPC(8): H04N19/37H04N19/164
CPCH04N19/164H04N19/37
Inventor 熊瑞勤刘航帆马思伟高文
Owner PEKING UNIV
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