Ambarella, Inc.
Lighting correction for motion detection and temporal filtering

Abstract:

An apparatus includes a first circuit and a second circuit. The first circuit may be configured to (a) receive (i) a plurality of first samples selected from a first picture of a sequence of pictures, (ii) a plurality of smooth first samples corresponding to the plurality of first samples, (iii) a plurality of second samples selected from a second picture of the sequence of pictures, and (iv) a plurality of smooth second samples corresponding to the plurality of second samples, and (b) generate a plurality of adjusted first samples by combining the smooth first samples, the first samples, and the smooth second samples. The second circuit may be configured to generate a plurality of values based on the plurality of adjusted first samples and at least one of the plurality of first samples and the plurality of second samples. The first samples and the second samples generally have different levels of a lighting condition. The adjusted first samples and the second samples generally have similar levels of the lighting condition.