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Self-adaptive straight line detection method based on Hough transform

A technology of Hough transform and line detection, applied in image data processing, instrumentation, calculation, etc., can solve problems such as insufficient edge information

Pending Publication Date: 2021-12-14
AEROSUN CORP
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Problems solved by technology

However, since the edge information of the image is usually not ideal, when using the Hough transform to detect the feature line on the edge of the part, the result is often not a straight line, but multiple lines with very close distances.

Method used

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  • Self-adaptive straight line detection method based on Hough transform
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  • Self-adaptive straight line detection method based on Hough transform

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Embodiment 1

[0028] The specific steps of the adaptive detection method based on Hough transform in this embodiment (see Figure 4 ), including the following specific steps:

[0029] first step, through figure 1 The measurement system shown is mainly composed of image acquisition module, part matching module, image measurement module, and front-end display module. It detects and obtains the contour information of the workpiece to be measured, and detects the figure 2 There are 17 straight lines in the contour information of the workpiece to be measured shown by the section line, and (3) and (5) in the figure are respectively three and five very adjacent straight lines that are difficult to observe with the naked eye.

[0030] Divide the detected straight lines into the first set A and the second set B according to whether the slope exists, and number the straight lines in the two sets in sequence as shown in Table 1 and Table 2; when the so-called slope exists, the intercept is the longi...

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Abstract

The invention relates to a self-adaptive straight line detection method based on Hough transform, and belongs to the technical field of image processing detection. The method comprises the steps of detecting straight lines in contour information through Hough transform; dividing data into a first set and a second set according to whether a slope exists or not; forming a first deviation matrix and a second deviation matrix by each set, and summing absolute values of all elements to obtain a total deviation matrix and an all-0 matrix; then comparing elements in the total deviation matrix with a self-adaptive threshold value, and after judgment, delecting rows and columns corresponding to a straight line passing through a small number of edge points appropriately till the elements in the all-0 matrix are all 0; counting the number of remaining straight lines of the first deviation matrix, and determining whether to continue loop iteration according to judgment until the number of the straight lines is equal to a judgment threshold value; then processing the second set likewise. After the method is adopted, the threshold value can be adaptively adjusted, the implementation of subsequent adaptive extraction is ensured, the speed of acquiring the straight lines is accelerated, and finally, the aim of detecting all straight lines in a picture at one time is fulfilled, so that a foundation is laid for ensuring the accuracy of an optical measurement result.

Description

technical field [0001] The invention relates to a straight line detection method, in particular to an adaptive straight line detection method based on Hough transform, belonging to the technical field of image processing and detection. Background technique [0002] Aerospace and other fields have very strict requirements on the size of equipment parts. The conventional method of manual inspection with measuring tools such as vernier calipers is not only slow, but also easily affected by human factors. It has been gradually replaced by optical measurement equipment, and with the continuous development of computer vision technology With the gradual improvement of the precision of hardware such as camera lenses, the technology of optical measurement using computer vision has attracted more and more attention. [0003] Compared with image recognition and image detection that have been widely used, image measurement has higher requirements on image quality, because the higher the...

Claims

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Application Information

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IPC IPC(8): G06T7/13G06T7/168
CPCG06T7/13G06T7/168G06T2207/20061Y02P90/30
Inventor 岳静姜一帆魏庭宇李谨男刘进江刘洪吉高嘉威范建存
Owner AEROSUN CORP
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