Two-Dimensional Windowing in the Structural Similarity Index for the Colour Image Quality Assessment

This paper presents the analysis of the usage of the structural Similarity (SSIM) index for the quality assessment of the colour images with variable size of the sliding window. The experiments leave been performed using the LIVE Image Quality Assessment Database in order to compare the linear correlation of achieved results with the Differential Mean Opinion Score (DMOS) values. The calculations have been done using the value (brightness) channel from the HSV (HSB) colour space as well as commonly used YUV/YIQ luminance channel and the, average of the RGB channels. The analysis of the image resolution's influence on the correlation between the SSIM and DMOS values for varying size of the sliding window is also presented as well as some result's obtained using the nonlinear mapping based on the logistic function.