| 摘要 |
A system generates image background and black threshold grey values associated with an image. The system includes a histogram buffer and a peak and valley detection circuit, operatively connected to the histogram buffer, to determine a first grey value having a peak frequency associated with a background, a second grey value having a peak frequency associated with a black threshold, and a third grey value having a minimum frequency associated with a histogram of the image. A quarter peak detection circuit, operatively connected to the histogram buffer, determines a fourth grey value having a frequency equal to one quarter of the peak frequency associated with the first grey value and a fifth grey value having a frequency equal to one quarter of the peak frequency associated with the second grey value. A sigma peak detection circuit, operatively connected to the histogram buffer, determines a sixth grey value having a frequency equal to five-eighths of the peak frequency associated with the first grey value and a seventh grey value having a frequency equal to five-eighths of the peak frequency associated with the second grey level. A neighboring bin detection circuit, operatively connected to the histogram buffer, determines a valley or peak relationship between a grey value being presently analyzed and neighboring grey values, and a parameter generation circuit generates an image background grey value and a black threshold grey value based on the first through seventh grey values.
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