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Underwater video compression method

A video compression and internal compression technology, applied in the field of image processing, can solve the problems of inability to meet the transmission requirements of limited bandwidth underwater acoustic channels, efficient compression of underwater video images, low compression ratio, etc., to ensure compactness, high compression ratio, The effect of increasing the compression ratio

Inactive Publication Date: 2009-06-03
OCEAN UNIV OF CHINA
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Problems solved by technology

[0004] Currently popular standard video image compression methods (such as MPEG-2, MPEG-4, H.263, H.264, etc.) cannot efficiently compress underwater video images, and the compression ratio is generally low, so they cannot meet the requirements of limited bandwidth water. Transmission Requirements for Acoustic Channels

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] refer to Figure 7 , illustrates a flowchart of an embodiment of an underwater video compression method of the present invention. As shown in the figure, the following steps are included:

[0054] Step S71, converting the image to be compressed in RGB space into YUV space.

[0055] That is, in this step, if the original image to be compressed is an image in RGB space, it is converted to YUV, and if the original image to be compressed is an image in YUV space, then this step is not required to directly perform subsequent steps.

[0056]At the same time, since the conversion of RGB to YUV is already a well-known technology, the specific conversion process will not be described here.

[0057] Step S72, preprocessing the image to be compressed in YUV space.

[0058] In this step, the Y (brightness) component in the YUV space data is subjected to one-level inte...

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Abstract

The invention discloses an underwater video compression method, which comprises intraframe compression and interframe compression of an image to be compressed. The image to be compressed is YUV spatial data. The method also comprises the step of wavelet transformation pretreatment of the image to be compressed before intraframe compression and interframe compression. The wavelet transformation pretreatment comprises the following steps: conducting at least first-order integer wavelet transformation of the Y-component of the image to be compressed, and rejecting at least one high-frequency component selected from LH, HL and HH. The method rejects at least part of the high-frequency components of the Y-component after wavelet transformation of the image to be compressed and remains the low-frequency component of the U and V components after wavelet transformation, so as to reduce data quantity to be encoded, thereby increasing compression ratio from another aspect under the premise of ensuring the image quality.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an underwater video compression method. Background technique [0002] The 21st century is the century when human beings enter the ocean. In order to explore and develop the ocean, humans must first observe the ocean. The underwater robot equipped with a camera system is the most advanced and convenient underwater operation device. However, how to transmit a large amount of video image information from underwater robots to surface workstations in real time is one of the challenges facing ocean exploration and development at home and abroad. [0003] The wireless information transmission from the underwater robot to the surface workstation can only rely on the underwater acoustic channel, and the underwater acoustic channel has the characteristics of "time-varying-space-varying-frequency-varying" random multipath transmission, and its effective bandwidth is very limited. The curren...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/63
Inventor 李庆忠王文锦臧爱云王建国
Owner OCEAN UNIV OF CHINA
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