Average grey-based method for extracting effective information region of range gating image

A technology with effective information and average grayscale, applied in the field of computer vision, it can solve the problem of inability to accurately extract effective information areas, and achieve the effect of reduced sensitivity to changes and good adaptability

Active Publication Date: 2011-07-27
北京中科盛视科技有限责任公司
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Problems solved by technology

[0006] Aiming at the problem that the existing technology cannot accurately extract the effective information area caused by the characteristics of the echo broadening effect image, the present invention proposes a method for extracti

Method used

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  • Average grey-based method for extracting effective information region of range gating image
  • Average grey-based method for extracting effective information region of range gating image
  • Average grey-based method for extracting effective information region of range gating image

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Embodiment

[0042] The initial threshold is obtained by counting the lowest gray level that is equivalent to the estimated area ratio of the effective information area. like figure 1 The effective information area in the middle is 9 pixels, and the whole image is 25 pixels, which can be estimated as 0.3, etc.

[0043] Most of the pixels in the information area of ​​the range-gated laser imaging image are brighter than the noise area. According to this ratio and the number of pixels in the image, the estimated number of pixels removed from image noise can be obtained. The grayscale histogram of the image is counted from the lowest level. When the total number of the low end of the grayscale histogram reaches the number of background pixels represented by this ratio, the gray level at the final stop is set as the initial threshold. When the threshold is greater than the empirical threshold of the background in the field, the maximum empirical threshold in the field is set as the initial th...

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Abstract

The invention discloses an average grey-based method for extracting an effective information region of a range gating image. The method comprises the following steps: calculating an initial threshold by utilizing priori knowledge; extracting an effective information region of an original image by utilizing the initial threshold; calculating an average grey value of an edge part of the extracted information region according to the edge part; acquiring a largest eight-connected region of an image background according to a cut result of the initial threshold, wherein the average grey value of the largest eight-connected region is approximate to that of a background region, and the average value of the largest eight-connected region is used as an average grey value of the background region; and comparing the average value of a strip region at the edge of the effective information region with the average grey value of the background region, measuring whether a final cut result cuts information and noise optimally or not by the difference of the average value of the strip region at the edge of the effective information region and the average value of the background region, adjusting the value of the initial threshold if the difference is not in an acceptable range, and performing iterative operation on the adjusted value used as a new initial threshold until the difference is in an acceptable range.

Description

technical field [0001] The invention relates to the technical field of computer vision, and relates to a method for extracting effective information areas of distance-gated images based on average grayscale. Background technique [0002] Distance-gated laser imaging technology has become a research hotspot at home and abroad, mainly because the technology can work under no-light conditions at night, has a long working distance, and has the ability to truly break through fog, rain, snow, etc. Use in low environment. It has a wide range of application prospects in the fields of long-distance night vision, underwater target detection and three-dimensional imaging. [0003] By controlling the delay between the gated pulse and the laser pulse, the range-gated imaging system can image specific spatial slices. According to the information characteristics of the sliced ​​image, the image can be divided into effective information area and noise area. The effective information area...

Claims

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Application Information

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IPC IPC(8): G06K9/46G06T7/00
Inventor 王国华王新伟周燕刘育梁
Owner 北京中科盛视科技有限责任公司
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