| 摘要 |
<p>An array of pixels in an image sensor comprises some pixels of relatively low photosensitivity. The low photosensitivity pixels allow the use of long integration times, which permits the reliable detection of pulsed light sources, such as LED vehicle brake lights, in the image. The higher sensitivity pixels have a shorter integration time and permit good low-level sensitivity. Lower pixel photosensitivity may be achieved by use of an attenuating filter or by use of a smaller sensing area. One of the green pixels in a repeating RGBG pattern may have a lower sensitivity than the other green pixel, or selected RGBG groups may have lower sensitivity (figure 6C). The dynamic range may be further improved by use of multiple exposures, each with different integration times (figure 3). Dynamic range may also be improved by adapting the pixel integration times in dependence on the image data captured in an initial calibration phase (figure 4).</p> |
