| 20110285983 | METHOD FOR THE OPTICAL MEASUREMENT OF VELOCITIES AND A SENSOR FOR THE OPTICAL MEASUREMENT OF VELOCITIES - A method for measuring a velocity of an object surface relative to a sensor having a plurality of light-sensitive elements arranged spaced apart from one another. Each light-sensitive element produces an element signal indicative of detected brightness. The method includes receiving element signals at intervals of time, producing a frequency signal according to a spatial frequency filter method, producing a correlation signal according to an image processing method, and monitoring the produced frequency signal regarding at least one of a frequency value and at least one quality feature of the frequency signal. The method also includes selecting a produced signal for determining the velocity of the object surface relative to the sensor, and selecting the correlation signal in the event that at least one of the frequency signal lies below a threshold frequency value and the frequency signal fails to achieve a threshold quality feature value. | 11-24-2011 |
