| 摘要 |
A color threshold analyzer includes a converter to convert signals representative of a pixel color value, e.g., red (R), green (G), and blue (B) signals, to signals representing hue (H), saturation (S), and intensity (I) values. Comparators are provided to compare the hue value to upper and lower hue reference values, the saturation value to a lower saturation reference value, and the intensity value to upper and lower intensity values. A switch may be provided to select a desired orientation (i.e., clockwise or counter-clockwise) on a polar hue scale to define the values between the upper ad lower hue reference values. A color identifier may output a signal indicating that the pixel color value corresponds to a desired color range in response to each of the H, S, and I values falling within their associated range. |
