Standard source image construction method for response non-uniformity correction in road imaging survey
A technology of non-uniform correction and imaging measurement, which is applied in the field of standard source image construction in response to non-uniform correction, which can solve the problems of narrow application range, low precision, cumbersome construction process, etc., and achieve a simple and practical shooting method Effect
Active Publication Date: 2020-11-03
DALIAN POLYTECHNIC UNIVERSITY
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Problems solved by technology
[0003] In order to obtain a uniform radiation standard source or reflection standard source in the existing technology, on the one hand, complex radiation source experimental facilities are required, and the construction process is relatively cumbersome; narrow range
Method used
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Embodiment Construction
[0040] 1. Build a standard source image
[0041] Step 1: Under the condition that the lighting conditions are basically unchanged, place the camera on a tripod at any position on the asphalt road and 1.5 meters above the road, set the exposure time and aperture of the camera so that the camera lens is perpendicular to the road.
[0042] Step 2: Keep the exposure time and aperture number of the camera unchanged, take a frame of image, and store it in RAW format.
[0043] Step 3: Keep the exposure time and aperture of the camera unchanged, move the tripod position with a certain step length (recommended 10cm), and rotate the lens at a certain angle. Every time the tripod position is changed and the lens is rotated at the same time, a frame of photos will be taken and saved. In RAW format, capture n frames of photos; (this step can randomly translate and horizontally rotate the lens to take photos)
[0044] Step 4: Combine all the photos taken into a mean image
[0045]
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The invention discloses a method for constructing a standard source image for response non-uniformity correction in road imaging measurement, comprising steps: 1. placing a camera at the position where the standard source image is to be constructed, and setting the exposure time and the exposure time of the camera in a response range Aperture number; 2. Take a frame of photos; 3. Collect n frames of photos by random translation and horizontal rotation of the lens; 4. Combine the photos taken in steps 2 and 3 into an average image 5. Repeat steps 3 and 4, when σ changes When it is less than 0.1%, stop repeating and synthesize standard source images; 6. Select other response ranges, that is, change the exposure time and aperture number of the camera, repeat steps 1 to 5, and construct standard source images under other response ranges. The standard source image construction method obtained by the method of the present invention has simple equipment, low price, good matching with the range of road scene response, and good practicability of the constructed standard source image.
Description
technical field [0001] The invention relates to a method for constructing a standard source image, more particularly, to a method for constructing a standard source image for response non-uniformity correction in road imaging measurement. Background technique [0002] The reflection of the road surface is the result of the joint action of diffuse reflection, specular reflection, diffuse reflection, mixed reflection, etc., but the diffuse reflection is the main one. Roadway imaging systems respond to non-uniform corrections often using point correction methods, which use a uniform radiation source to achieve a uniform radiation or emission characteristic (Lambert reflection). The image obtained from the standard source based on the imaging system is called the standard source image. [0003] In order to obtain a uniform radiation standard source or reflection standard source in the existing technology, on the one hand, complex radiation source experimental facilities are req...
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IPC IPC(8): H04N5/235H04N5/243
CPCH04N23/76H04N23/73
Inventor 谢蓄芬尚颖英
Owner DALIAN POLYTECHNIC UNIVERSITY