Gamma Transformation (Tone Rescaling)by Sigmoid Function (II): Subjective Estimation by Paired Comparison
Abstract:The digital technology is greatly developed in recent years. In the world of a photograph, the information of image is digitized and the digital image technology centering on a computer is progressing with the spread of the digital still cameras. In this research, tone rescaling of a digital image is performed using sigmoid function. It is found that the tone rescaling by sigmoid function improves the image quality when the peak position of the slope of sigmoid function is adjusted to the peak of histogram of region - of - interest. The improvement of the image quality is confirmed by subjective estimation.
Document Type: Research Article
Publication date: January 1, 2001
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