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Dynamic sampling-based method for extracting laser spot

A technology of laser spot and dynamic sampling, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve the problems of misjudgment, high pixel color value, etc., and achieve the effect of improving anti-interference ability

Active Publication Date: 2012-10-24
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with changes in light intensity, exposure or brightness, some pixels may have too high a color value, making them reach the spot color gamut, and be mistaken for spot pixels, resulting in misjudgment

Method used

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  • Dynamic sampling-based method for extracting laser spot

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Embodiment Construction

[0020] 1) Stabilize the light source and ambient light, stabilize the camera position, and make the brightness change in the environment smaller.

[0021] 2) Adjust the exposure and brightness of the camera, so that the exposure and brightness can meet the needs of users and not be too dim to be recognized, and can be controlled at a lower value, so that the number of high-brightness points collected by the camera is less, and the The color gamut of the overall image is controlled within a certain range.

[0022] 3) The projector projects a white image on the wall, and the camera captures the image to obtain the image P_SOURCE. Because there are certain unstable factors in the images collected by the camera itself, continuous acquisition can be adopted to obtain 30~60 frames of images continuously. Calculate the average value of each pixel of the image. Then the color gamut range of P_SOUCE is statistically calculated as [S_MIN, S_MAX].

[0023] 4) The user controls the las...

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Abstract

The invention discloses a dynamic sampling-based method for extracting the laser spot. The method comprises the following steps: 1) the position of a camera is fixed, the visual angle of the camera is adjusted to ensure that the projection area is in the vision field of the camera; 2) a projector is used to project a white image on the wall suface, the camera captures the image to obtain the P_SOURCE of the image; 3) the point with the maximum brightness is extracted to ensure that the maximum brightness of the image is about 200 and the brightness saturation is 255; 4) a laser pointer is used to project a laser spot in the image-capturing range of the camera, the camera captures the image to obtain the P_LASER of the image; 5) according to the P_SOURCE and the P_LASER, the color gamut range [LASER_MIN, LASER_MAX] of the laser spot under the condition is generated; 6) the laser spot is extracted according to the generated color gamut range of the spot; and 7) if the intrinsic brightness of the environment changes, the step 1) is performed again.

Description

technical field [0001] The invention relates to a method for extracting laser spots based on dynamic sampling, and belongs to the technical field of dynamic sampling and extraction of laser spot feature values ​​in image processing technology. Background technique [0002] The traditional spot extraction method adopts the threshold segmentation method, and sets a certain range according to the high brightness characteristics of the laser spot, such as 200~255 for the laser spot color gamut. Then, the pixels whose color value is within the threshold range are identified as laser spot pixels. However, with changes in light intensity, exposure or brightness, some pixels may have too high a color value, making them reach the spot color gamut, and be mistaken for spot pixels, resulting in misjudgment. Contents of the invention [0003] The purpose of the present invention is to provide a method for extracting laser spots based on dynamic sampling in view of the defects existin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46
Inventor 许峰史团委徐新坤姚岚张雪洁
Owner HOHAI UNIV