Title :
A Perceptually Adaptive Scheme for Image Bit-Inversion-Based Watermarks
Author :
Kimoto, Tadahiko ; Kosaka, Fumihiko
Author_Institution :
Fac. of Sci. & Eng., Toyo Univ., Saitama, Japan
Abstract :
A perceptually adaptive scheme for image watermarking by bit inverting transformation is developed. The transformation performs the change of a signal level by both inverting a bit and changing the level at random in a limited range. From the property analysis of the transformation, a perceptual model of two metrics of level distortion is assumed for evaluating a subjective visual quality of the transformed image. The measurements of image quality by the human subjective evaluation are analyzed and then, the evaluation function that can yield an estimate of the subjective visual quality from the two distortion measurements of the transformed image is determined. By using the evaluation function, every image region is transformed with its parameter adaptively changed so as to achieve a desired visual quality. The simulation results demonstrate the performance of the evaluation function and show a linear correlation between the evaluated values and the measurements of visual quality.
Keywords :
computer vision; image watermarking; bit inverting transformation; human subjective evaluation; image bit-inversion-based watermarks; image quality; perceptually adaptive scheme; signal level; visual quality; Adaptation model; Dynamic range; Phase distortion; Pixel; Visualization; Watermarking; digital watermark; perceptual model; perceptually adaptive system; spatial domain; subjective image quality;
Conference_Titel :
Signal-Image Technology and Internet-Based Systems (SITIS), 2010 Sixth International Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-9527-6
Electronic_ISBN :
978-0-7695-4319-2
DOI :
10.1109/SITIS.2010.29