A standard source image construction method for responding to non-uniformity correction in road imaging measurements
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, can solve the problems of narrow application range, cumbersome construction process, and low precision, and achieve good practicability and simple shooting method Effect
Active Publication Date: 2018-12-11
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
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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 standard source image construction method for responding to non-uniformity correction in road imaging measurement. The method comprises the following steps: 1, placing a camera at a position of a standard source image to be constructed, and setting an exposure time and an aperture number of the camera in a response range; 2, taking a frame of picture; 3, randomly translating and horizontally rotating a len to collect n frames of images; 4, synthesizing the images taken in steps 2 and 3 into an average image (shown in the description) 5, repeating that steps 3 and 4, when the sigma change is less than 0.1 percent, stopping repeat and synthesizing a standard source image; 6, selecting other response ranges, i. e. changing exposure time and the aperture number of thecamera, repeating steps 1 to 5 to construct a standard source image under the other response ranges. The standard source image construction method obtained by the method of the invention has the advantages of simple equipment, low price, good matching with the range of the response of the road scene, and good practicability of the standard source image construction.
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...
Claims
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IPC IPC(8): H04N5/235H04N5/243H04N23/76
CPCH04N23/76H04N23/73
Inventor 谢蓄芬尚颖英
Owner DALIAN POLYTECHNIC UNIVERSITY