Method for quickly positioning light spot image center based on geometric method
A technology of spot image and positioning method, which is applied in the field of image processing, can solve problems such as being easily affected by interference points or noise, poor anti-interference performance, and limited measurement accuracy, and achieves the advantages of hardware implementation, high precision, and improved calculation speed Effect
Inactive Publication Date: 2014-07-16
BEIHANG UNIV
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[0003] Usually, the template method and the moment estimation method have the disadvantages of large amount of calculation and slow speed; the center of gravity method requires the spot shape to be relatively regular and the gray scale relatively uniform, otherwise large errors will occur; the Hough transform method needs to discretize the parameter space , which limits the measurement accuracy and is limited in practice; although the curve fitting method can achieve sub-pixel accuracy, it has poor anti-interference performance and is easily affected by interference points or noise
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[0019] The present invention, that is, a fast positioning method for the center of a spot image, comprises the following steps:
[0020] Step 1: Obtain the gray level distribution I(i, j) of the partial image of the axisymmetric light spot by measurement.
[0021] Step 2: Randomly select any two points on the spot image, assuming they are A and B, and calculate the straight line l passing through these two points 1 .
[0022] Step 3: In the straight line l 1 Randomly select two points C(x c ,y c ), D(x d ,y d ), calculate the perpendicular line of the line segment with these two points as endpoints, where x represents the abscissa and y represents the ordinate.
[0023] y = - ( x d - x c y d - ...
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The invention relates to a method for quickly positioning a light spot image center based on a geometric method. The method for quickly positioning the light spot image center based on the geometric method is characterized by comprising the following steps that (1) the grey level distribution I (x, y) of part of the image of axial symmetry light spots is obtained through measurement; (2) any two points on the image of the light spots are randomly selected, and a straight line passing through the two points is calculated; (3) any two points with the same grey level value are selected in the straight line, and the perpendicular bisector of a line segment with the two points as the endpoints is calculated; (4) 2N points in the light spot image are randomly selected, wherein at least one point is different from the points selected in the step (2), the N is larger than or equal to one, the step (2) and the step (3) are executed again, and perpendicular bisector equations are simultaneous to form an equation set; (5) a least-squares method is used for solving the equation set to obtain the position (x0, y0) of the light spot image center. According to the method, few points are randomly selected to quickly position the light spot image center, under the condition that light spot images are distributed evenly, the precision is high, the real-time performance is good, memory space is small, and hardware implementation is easy.
Description
【Technical field】 [0001] The invention relates to a fast positioning method of the spot image center based on a geometric method, which belongs to the field of image processing. 【Background technique】 [0002] Spot center detection is a key technology in optical measurement and detection methods such as laser scanning triangulation, collimator, and spot analyzer. It has also been a research hotspot in the field of pattern recognition. Usually the accuracy and speed of the detection algorithm directly affect the accuracy and speed of the measurement. Many algorithms for spot center detection have been proposed. For example: template method, moment estimation method, center of gravity method, Hough transform circle detection, circle fitting method, etc., but these algorithms have certain shortcomings in detection accuracy, speed and anti-interference. [0003] Usually, the template method and the moment estimation method have the disadvantages of large amount of calculation...
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IPC IPC(8): G06T7/60
Inventor 徐立军曹章魏天啸周家怡辛蕾
Owner BEIHANG UNIV