Optical test device for a vehicle camera and testing method
First Claim
1. A method of testing a camera for vision system for a vehicle, said method comprising:
- providing a camera configured for mounting and use on a vehicle, said camera having a field of view, wherein said camera is operable at selected ones of a plurality of register settings;
providing a test pattern in the field of view of the camera;
capturing image data with said camera;
wherein capturing image data comprises capturing at least two frames of image data using different register settings having noise filtering at a respective one of at least two levels between a maximum noise filtering and a minimum noise filtering;
measuring the signal to noise ratio for each of the at least two frames of captured image data;
measuring a texture value for each of the at least two frames of captured image data; and
selecting a compromise between noise reduction and texture preservation.
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Abstract
A method of testing a camera for vision system for a vehicle includes providing a camera configured for mounting and use on a vehicle. The camera is operable at selected ones of a plurality of register settings. A test pattern is disposed in the field of view of the camera and at least two frames of image data are captured with the camera using different register settings having noise filtering at a respective one of at least two levels between a maximum noise filtering and a minimum noise filtering. The signal to noise ratio is measured for each of the at least two frames of captured image data. A texture value is measured for each of the at least two frames of captured image data. A compromise is selected between noise reduction and texture preservation.
17 Citations
20 Claims
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1. A method of testing a camera for vision system for a vehicle, said method comprising:
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providing a camera configured for mounting and use on a vehicle, said camera having a field of view, wherein said camera is operable at selected ones of a plurality of register settings; providing a test pattern in the field of view of the camera; capturing image data with said camera; wherein capturing image data comprises capturing at least two frames of image data using different register settings having noise filtering at a respective one of at least two levels between a maximum noise filtering and a minimum noise filtering; measuring the signal to noise ratio for each of the at least two frames of captured image data; measuring a texture value for each of the at least two frames of captured image data; and selecting a compromise between noise reduction and texture preservation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of testing a camera for vision system for a vehicle, said method comprising:
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providing a camera configured for mounting and use on a vehicle, said camera having a field of view that encompasses a partial spherical surface, wherein said camera is operable at selected ones of a plurality of register settings; providing a test pattern in the field of view of the camera; wherein the test pattern is provided at the partial spherical surface; capturing image data with said camera; wherein capturing image data comprises capturing at least five frames of image data using different register settings having noise filtering at a respective one of at least five levels between a maximum noise filtering and a minimum noise filtering; measuring the signal to noise ratio for each of the at least five frames of captured image data; measuring a texture value for each of the at least five frames of captured image data; and selecting a compromise between noise reduction and texture preservation. - View Dependent Claims (16, 17, 18)
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19. A method of testing a camera for vision system for a vehicle, said method comprising:
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providing a camera configured for mounting and use on a vehicle, said camera having a field of view, wherein said camera is operable at selected ones of a plurality of register settings; providing a test pattern in the field of view of the camera; capturing image data with said camera; wherein capturing image data comprises capturing at least five frames of image data using different register settings having noise filtering at a respective one of at least five levels between a maximum noise filtering and a minimum noise filtering; measuring the signal to noise ratio for each of the at least five frames of captured image data; measuring a texture value for each of the at least five frames of captured image data; plotting the measured signal to noise ratios and the measured texture values; and selecting a register setting that is closest to an intersection of the plot of the measured signal to noise ratios and the measured texture values. - View Dependent Claims (20)
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Specification