A method and device for enhancing weak and small targets based on difference

A technology of weak and small targets and enhancement devices, applied in image enhancement, image data processing, instruments, etc., can solve the problems of weak background of dense stars and enhancement of weak and small target signals, so as to improve target contrast, enhance weak and small targets, and avoid the influence of brightness Effect

Inactive Publication Date: 2017-02-22
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the shortcomings of the prior art, the present invention provides a method and device for enhancing weak and small targets based on difference, which solves the problem of enhancing weak and small targets in dense star background, effectively suppresses the background of stars, and enhances the signal of weak and small targets

Method used

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  • A method and device for enhancing weak and small targets based on difference
  • A method and device for enhancing weak and small targets based on difference
  • A method and device for enhancing weak and small targets based on difference

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Experimental program
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Effect test

Embodiment 1

[0063] Such as figure 2 , Figure 4 Shown is an original frame of the image sequence collected by the photoelectric telescope. Since the telescope follows the movement of the stars in the image sequence, the stars appear to be stationary in the image, and the weak target of interest has location changes. It can be seen from the figure that the stars in the image are dense, and the target and the star are indistinguishable in terms of shape and gray scale. If the star can be suppressed and the target of interest can be retained, the target can be enhanced. Enhancing the gray level of the target can further enhance the target.

[0064] First put figure 2 The previous frame image, such as Figure 8 As shown, dilation is performed with 3×3 morphological structure elements,

[0065] The expansion formula is:

[0066]

[0067] then use figure 2 with an inflated image such as Figure 9 As shown, the difference is performed, and the difference formula is:

[0068] ...

Embodiment 2

[0071] Such as Figure 6 Shown is an original frame of another sequence of images collected by the photoelectric telescope. When collecting this sequence of images, the telescope follows the movement of the weak and small target of interest. At this time, the small target of interest appears as Still, the star has displacement between the frames of the sequence image. In order to suppress the star, it is necessary to calculate the distance of the star moving between the frames, and use this distance as the registration amount to implement the differential enhancement method of the present invention. The steps of implementing the differential enhancement method of the present invention are:

[0072] First put Figure 6 The previous frame image, such as Figure 10 As shown, a 3×3 morphological structure element is used for

[0073] Expansion, the expansion formula is:

[0074]

[0075] then use Figure 6 with an inflated image such as Figure 11 As shown, the differen...

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Abstract

The invention discloses a difference-based weak and small target enhancement method and device, belongs to the field of image processing, and solves the problem of weak and small target enhancement in dense star background. One frame of image and the next frame of image, wherein, the next frame of image is the image that needs to be differentiated; (2) the previous frame image collected by dilation; (3) the previous frame image after expansion and the next frame image do At the same time, according to the pixel gray value corresponding to the two adjacent frames of images (both original images) of the difference and the difference result (that is, the gray value obtained by the difference), the gray scale is stretched to obtain an enhanced image. The invention suppresses the background of stars and enhances the weak and small target signal.

Description

technical field [0001] A method and device for enhancing weak and small targets based on difference, which suppresses the background of stars and enhances signals of weak and small targets, and belongs to the field of image processing. Background technique [0002] The enhancement of weak and small targets in the background of stars is a major technical problem in starry sky observation. How to enhance weak and small targets similar to stars in images densely populated by stars, scholars at home and abroad have put in a lot of labor and painstaking efforts, and have obtained some effective methods. Such as: the method based on histogram, the method of grayscale transformation, etc. These methods have obvious enhancement effects on some specific types of star background images, but the enhancement effects on certain types of images are not satisfactory. [0003] The shape of the weak target that needs to be enhanced in the dense star background image is similar to the star, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 魏敏文武魏维
Owner CHENGDU UNIV OF INFORMATION TECH
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