Projection grating self-correction method
A self-calibration and projection technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems that the grating fringes do not meet the sinusoidal distribution, the projected grating field does not meet the sinusoidal distribution, etc., and achieves improved accuracy, strong adaptability, high effect of speed
Inactive Publication Date: 2010-06-23
HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG +1
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But in fact, the grating stripes do not satisfy the standard sinusoidal distribution, which is due to the influence of factors such as electronic noise and nonlinearity in the projection process, and because the projection units in the projector are uniformly and discretely distributed on the projection surface However, the grating stripes projected into the space are continuous, and there is a process from discrete signals to continuous signals, which directly leads to the projected grating field obtained by the projector not meeting the standard sinusoidal distribution
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[0040] Below with reference to accompanying drawing, specific embodiment of the present invention is described in more detail:
[0041] see figure 1 , The raster projection system: includes a computer 1, a camera 3 connected to the computer 1 through a chart 2, and a projector 4 controlled by the computer 1, and the object to be measured is 5.
[0042] see figure 2 , the optical path diagram of the grating projection system, the projection pixel units of the projector 4 are distributed on the projection surface 6, and are set by computer control; the grating stripes are projected, and the grayscale distribution of the stripes in space is 7; 9 is the measured object; the camera 3 Take images of the stripes, 8 is the imaging plane of the camera 3 . During measurement, according to the spatial structure relationship of the system, the surface shape of the measured object is reconstructed from the fringe image. The purpose of self-calibration is to make the gray distribution o...
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The invention discloses a grating projection self-correction method in a grating projection three-dimensional measurement system, a grating stripe which is projected is enabled to satisfy a standard sinusoidal distribution by adjusting the gray level distribution of a projection apparatus. The steps comprises (1) setting the gray level distribution of the projection apparatus as the standard sinusoidal distribution, (2) the projection projects the grating strip, using a phase-shift method to obtain the phase of the projection apparatus of the grating strip and the spatial phase distribution, (3) obtaining the correct value of the gray level distribution of the projection apparatus by mapping relations of the gray level and the phase position, and setting the gray level distribution of theprojection apparatus as the correct value. After three to five times self-correction, the grating strip projected by the projection apparatus gradually achieves the best sinusoidal distribution. The method has the advantages of strong practicability, high precision and fast speed.
Description
technical field [0001] The invention relates to a projection grating self-correction method in a grating projection method three-dimensional measurement system, in particular to a projection grating self-correction method based on a phase shift method. Background technique [0002] The grating projection technology based on the phase method is developed in recent years and is a representative active vision technology. This method projects sinusoidal grating fringes onto the measured object, and obtains the high-precision grating phase field distribution from the fringe image, and then obtains the three-dimensional shape of the object. The grating fringes projected by the projection system need to meet the standard sinusoidal distribution, which is one of the key links to determine the accuracy of the entire vision system. [0003] In recent years, with the development of projection technology, digital projectors are widely used in raster projection systems. Digital project...
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IPC IPC(8): G01B9/08G01B11/24
Inventor 盖绍彦达飞鹏李勤
Owner HAIAN COUNTY SHENLING ELECTRICAL APPLIANCE MFG