Gamma Correction Parameter Estimation Via Histogram Gap Feature
This paper first analyzes the empty-bin distribution characteristics of the his-togram of the gamma-corrected image and the gap feature of the histogram after the inverse gamma transformation on the gramma-corrected image.Subsequently,this gap feature from the inverse transform histogram is applied to estimate the tampered image parameters.Specifically,we first determine whether the image has undergone gamma cor-rection by comparing the number of zero values at both ends of the histogram.Then we estimate the parameters accurately by the inverse-transformed histogram gap feature.Ex-perimental results show that the proposed method outperforms the existing methods in terms of parameter estimation accuracy and demonstrating robustness on JPEG images with different quality factors before the transformation.
万方数据
维普
