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Discrete cosine phase information-based multi-spot detection and locating method

A technology of phase information and spot detection, applied in image data processing, instruments, calculations, etc., can solve problems such as missing image structure features, and achieve the effect of strong anti-interference and fast calculation speed

Inactive Publication Date: 2016-11-09
NANJING KANGNI MECHANICAL & ELECTRICAL
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Problems solved by technology

At the same time, the phase spectrum represents the position information of the data, and the phase spectrum reconstruction can preserve the effective information of the image, while the amplitude spectrum reconstruction will lose all the structural features of the original image

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  • Discrete cosine phase information-based multi-spot detection and locating method

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Embodiment Construction

[0030] The technical solution will be described in detail below through a preferred embodiment and in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, a multi-spot detection and positioning method based on discrete cosine phase information includes the following steps:

[0032] S1: Preprocessing the spot image based on the phase spectrum to extract the salient area, specifically including the following sub-steps:

[0033] S1.1: Grayscale the color image;

[0034] S1.2: Perform discrete cosine transform on the grayscale image to extract amplitude information and phase information;

[0035] S1.3: Filter the phase information, and calculate the phase information difference before and after filtering;

[0036] S1.4: Inverse discrete cosine transform is performed on the difference between the amplitude information and the phase information obtained in S1.3 to obtain a reconstructed image.

[0037] S2: Perform binarization calculation on the prepro...

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Abstract

The invention discloses a discrete cosine phase information-based multi-spot detection and locating method. The method comprises the steps of performing binary cutting and edge detection by traversing a threshold maximum variance by adopting multi-target regional augmentation of discrete cosine phase information, and performing multi-spot centroid calculation by adopting an image moment method to finally obtain edges and centroids of all spots. According to the method, phase information of discrete data is fully considered for realizing image target detection. The method is high in calculation speed, effective and reliable in effect and suitable for related fields of laser measurement, robot vision locating, optical precision measurement and the like.

Description

technical field [0001] The invention relates to a method for detecting and locating light spots, in particular to a method for detecting and locating light spots based on digital images. Background technique [0002] Spot detection is a key technology in precision measurement and detection methods such as laser collimator, laser measurement, optical speed measurement, etc. The accuracy of detection algorithm and calculation speed directly affect the effect of optical measurement. The traditional spot detection methods include center of gravity method, median method and Hough transform method. The former two are prone to large errors when the distribution of spot images is uneven, while the Hough transform needs to be voted and recorded point by point, the calculation amount is relatively large, and it is also easily affected by noise. However, the actual spot data is easily disturbed by the environment, and there are problems such as uneven brightness, overexposure, and noi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
CPCG06T7/0004G06T2207/10024G06T2207/20024
Inventor 缪小冬史翔王爱青许志兴王卫邵现京
Owner NANJING KANGNI MECHANICAL & ELECTRICAL
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