Contrast adjustment in digital image processing method employing histogram normalization

摘要: A problem in digital image processing employing a tone reproduction function that maximizes the quality of processed is to automatically determine overall contrast image. In an improved method for determining image, determined as standard deviation sample values used generate by normalizing histogram values. The selected from one plurality samples corresponding intervals based upon shape To facilitate adjustment contrast, constructed produce units normal variate Z. These Z are then multiplied constant which representing mean density output medium added position scale with respect tonal range medium.