As the issue of wide dynamic range imaging, some adjustments are needed to display an image with wider dynamic
range than that of displays. Because the dynamic range of existing displays is limited to 10 from 8 bits for each color, the
image quality degrades when the characteristic is not suitable for the objects. One of our smart image sensors can control
the integration time of each pixel. In the sensor, the intermediate photodiode value is compared with arbitrary threshold
at arbitrary timing and reset depending on the result. We call this "judgment and reset process". The characteristic for
wide dynamic range imaging is decided by thresholds and timings. So optimization of the parameters adapted to the
brightness distribution of objects and the new sensor which realizes the proposed method are reported. Before the first
judgment, the PD values are read out and passed to the external circuit in order to estimate the rough histogram of the
image at a frame end. In the histogram, successive pixels are recognized as the detected block. Quota of output values in
the characteristic is mainly decided by the block width. In consequence, the dynamic range is widened and the contrast is
dramatically improved.
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