VERFAHREN ZUR BILDERFASSUNG DURCH EINEN BILDSENSOR VOM CMOS-TYP ZUR ERKENNUNG EINES OPTISCH LESBAREN CODES

摘要

The invention proposes a method of image acquisition of a target code which allows the CMOS sensor, after triggering of the reader for the acquisition of a target code, to determine rapidly, and internally, a desirable value Topt of exposure time for capturing an image of this code. When it is triggered, the sensor activates a mode of measurement Mode_MES with fast acquisition of image data for k different values of exposure time Ti, i=1 to k, k at least equal to 2 and this acquisition serves only for the sensor and only to rapidly define a desirable value of exposure time on the basis of the histograms calculated H(Ti) on the image data acquired for the various exposure times; this value is stored in the register of picture capture parameters, and the sensor then activates a nominal image acquisition mode Mode_ACQ, which applies this desirable exposure time value provided by the register to all the pixels of the matrix, and the image obtained DATA-OUT is that delivered as output by the sensor, for code decoding/recognition by an external system.