CS (compressed sensing) distributed type based video coding transmission method in WMSN (wireless multimedia sensor network)

A technology of distributed video and transmission method, applied in the transmission strategy of distributed video coding and the transmission field of distributed video coding, can solve the problem of not being able to cope with massive data collection, etc., and achieve the advantages of small occupation, high reconstruction quality, and improved PSNR. Effect

Active Publication Date: 2015-07-22
NANJING INST OF TECH
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Problems solved by technology

However, distributed coding still uses the Nyquist rate for data collection and cannot cope with the massive data collection in the video field. The way of acquisition and compression-compressed sensing

Method used

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  • CS (compressed sensing) distributed type based video coding transmission method in WMSN (wireless multimedia sensor network)
  • CS (compressed sensing) distributed type based video coding transmission method in WMSN (wireless multimedia sensor network)
  • CS (compressed sensing) distributed type based video coding transmission method in WMSN (wireless multimedia sensor network)

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Embodiment

[0033] The embodiment is a CS-based distributed video coding transmission method in WMSN, which solves the problem of channel resource utilization in the existing transmission scheme. The embodiment includes key frame selection, adaptive GOP selection and adaptive sampling rate selection under different channel BER environments. In the wireless multimedia sensor network, due to the problem of the computing power of the sensor nodes, most of the images collected by the sensor are uncompressed Bitmap images. The BMP image is relatively large, and the feasibility of direct transmission is relatively small. The transmission strategy provided by the embodiment can make the video coding based on compressed sensing in the multimedia wireless sensor network adapt to the requirements of network bandwidth, so that it can be more conveniently put into practical applications.

[0034] A transmission method based on CS distributed video coding in WMSN, such as figure 1 , adaptive GOP sele...

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Abstract

The invention provides a CS (compressed sensing) distributed type based video coding transmission method in a WMSN (wireless multimedia sensor network). The method includes: performing self-adaptive GOP (group of pictures) selection and self-adaptive sampling rate selection under different channel BER (basic encoding rules) environments; on the basis of perceptual coding compression, realizing data size compression through difference frame coding; performing threshold judgment on points of a difference frame, performing zero setting on pixel points within the threshold, and retaining points outside the threshold. Compared with an existing transmission strategy algorithm, the video coding transmission method has the advantages that utilization of the channel bandwidth is better, reconstruction quality in video reconstruction is higher, and peak signal to noise ratio (PSNR) of a restored image is higher than that with the original algorithm. Meanwhile, the transmission strategy is smaller in occupation of the transmission bandwidth as compared with the existing algorithm.

Description

technical field [0001] The present invention relates to a transmission strategy of distributed video coding based on compressed sensing in a multimedia wireless sensor network, specifically a transmission method of distributed video coding based on CS in a WMSN, belonging to compressed sensing and distributed video coding In the technical field, it mainly solves the problem of channel resource utilization in existing transmission schemes. Background technique [0002] In the traditional field of signal processing theory, the Nyquist theorem points out that to achieve accurate restoration of sampled signals, the sampling rate must be more than twice the bandwidth of the original signal. In video communication, the actual signal is a broadband signal, which inevitably increases the burden on the sampling link, and the general sampling equipment is relatively expensive and bulky, which seriously limits the application of Nyquist sampling law in the field of video communication....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/30H04N19/177H04N19/105
Inventor 陈瑞杨坤张奔杨洁
Owner NANJING INST OF TECH
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