Patent ID: 7129983
Filing Date: 2006-10-31
Classification: H04N

Abstract:
1. A method for controlling a flash unit used for illuminating an object to be imaged in connection with an electronic image sensor based on a 2-dimensional pixel matrix, the electronic image sensor having a plurality of discrete sub-areas that combine to form an image area, wherein an exposure of the image sensor to form one image is performed by exposure of all of the sub-areas by using a rolling electronic shutter, wherein the exposure of at least some of said sub-areas takes place at different times during a time of exposure of said one image, and further wherein, several discrete, successive flashes of the flash unit are used to achieve even exposure of the image area, which flashes are timed in such a way that each single flash is performed at a point of time which is common to an integration or exposure time of as many successive sub-areas greater than one of the image sensor as possible, and that the successive flashes of the flash unit are also timed in such a way that one and only one flash of the flash unit occurs during the integration or exposure time of each single sub-area.