![]() ![]() (Of course, dirt on the sensor can result in the same stripes, too.) This can be eliminated by calibration, too. In case of line scan cameras, this can be observed along the line and result in image stripes. Particularly CMOS sensors show a grid-shaped brightness distribution in an extensive grey image which looks like a print raster over the actual image.Each unexposed pixel should provide the same black value after calibration. ![]() In this way, different dark currents of the single pixels are determined and calibrated. Dark image calibration: for this purpose the cap is shortly put onto the lens - done.The calibration is done in one or two steps: #Blue eye calibration software software#In order to compensate this inhomogeneity, each renowned line scan camera manufacturer provides a ready-made software interface for the calibration of the camera. In the above image, too, larger brightness variations in X-direction are still recognisable. If the image layout in X-direction and Y-direction is right and the image brightness more or less, the next step is the fine tuning. Tips for the alignment of the lighting can be found here. Vertical lines and shading effects of the illuminationįirst of all make sure that the illumination exactly covers the captured image region. Only in this way you can be sure that you capture undistorted images of good quality. by means of a calibration grid, the form of circles or squares in X-direction and Y-direction. Please do not rely on your eyes, but measure, e.g. ![]()
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