Method for adjusting an image sensor
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Abstract
A method and a processing unit for adjusting the characteristic curve of the exposure sensitivity of at least one pixel of at least one image sensor in a motor vehicle are described. The optimal characteristic curve of the exposure sensitivity is determined from the histogram of the gray values of at least one image as a function of image signals from at least one image sensor. The freely definable characteristic curve of the image sensor having linear segments is chosen so that it agrees at least approximately with the optimal characteristic curve. Along with the size and/or the position of the characteristic curve of the exposure sensitivity, alternatively or in addition the shape of the characteristic curve is adjusted.
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Citations
34 Claims
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1-14. -14. (canceled)
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15. A method for adjusting a characteristic curve of an exposure sensitivity of at least one pixel of at least one image sensor, in a motor vehicle, the characteristic curve being formed in segments of functions, the method comprising:
adjusting the characteristic curve of the exposure sensitivity as a function of image signals from at least a part of the scene registered by the at least one image sensor so that at least one of the following is satisfied;
a frequency of the gray values of at least a part of the histogram of image signals from the at least one image sensor of the at least one part of the registered scene is approximately constant; and
the gray value density of at least a part of the histogram of image signals from the at least one image sensor of the at least one part of the registered scene is approximately constant.- View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A processing unit for generating at least one adjustment signal for adjusting the characteristic curve of the exposure sensitivity of at least one pixel of at least one image sensor, including in a motor vehicle, the characteristic curve being formed in segments of functions, including of linear functions, comprising:
an arrangement to generate the at least one adjustment signal to adjust the characteristic curve of the exposure sensitivity as a function of image signals from at least a part of the scene registered by the at least one image sensor so that at least one of a frequency of the gray values of at least a part of the histogram of image signals from the at least one image sensor of the at least one part of the registered scene is approximately constant, and a gray value density of at least a part of the histogram of image signals from the at least one part of the registered scene is approximately constant. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A computer program executable on a computer, comprising:
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a program code arrangement for adjusting a characteristic curve of an exposure sensitivity of at least one pixel of at least one image sensor, in a motor vehicle, the characteristic curve being formed in segments of functions, by performing the following;
adjusting the characteristic curve of the exposure sensitivity as a function of image signals from at least a part of the scene registered by the at least one image sensor so that at least one of the following is satisfied;
a frequency of the gray values of at least a part of the histogram of image signals from the at least one image sensor of the at least one part of the registered scene is approximately constant; and
the gray value density of at least a part of the histogram of image signals from the at least one image sensor of the at least one part of the registered scene is approximately constant. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification