Assessing the similarity of two images is a complex task that attracts significant efforts in image processing community. The widely used structural index measure (SSIM) addresses this problem by quantifying perceptual similarity. In paper we consider recently introduced continuous SSIM (cSSIM), which allows one to analyze sequences increasingly fine resolutions, and further extend definition e...

Digital image compression is a technique that allows to reduce the size of an image in order to increase the capacity storage devices and to optimize the use of network bandwidth. The quality of compressed images with the techniques based on the discrete cosine transform or the wavelet transform is generally measured with PSNR or SSIM. Theses metrics are not suitable to images compressed with t...

This article evaluates the similarity of images of natural textures with changes of scale and rotation, through the application of structural metrics. The applied metrics are: Complex-Wavelet Structural Similarity Metric (CW-SSIM) and Structural Texture Similarity Metric (STSIM). First a decomposition of the images in sub-bands was realized. With the generated information the descriptors were e...

We tested the validity of the “Law of Increasing State Activities” or Wagner’s Law using time series for the U.S. state-local government (SLG) real expenditure over the period 1957-2006. This period was characterized by rising SLG total expenditure and several of its sub-categories both in absolute terms and relative to state personal income. Cointegration tests of Johansen (1991) and Pesaran, ...

Face recognition is an interesting field of computer vision with many commercial and ‎scientific applications. It is considered as a very hot topic and challenging problem at the ‎moment. Many methods and techniques have been proposed and applied for this purpose, ‎such as neural networks, PCA, Gabor filtering, etc. Each approach has its weaknesses as ‎well as its points of strength. This paper...

Significant progress has been made recently towards the next generation video coding standard by the Joint Collaborative Team on Video Coding (JCT-VC) of ISO/IEC Moving Picture Experts Group (MPEG) and ITU-T Video Coding Experts Group (VCEG). The test model, known as High Efficiency Video Coding (HEVC), aims to achieve 50% coding gain over the current MPEG4/H.264 AVC standard. Recently reported...

Subjective quality measures based on Human Visual System for images do not agree well with well-known metrics such as Mean Squared Error and Peak Signal to Noise Ratio. Recently, Structural Similarity Measure (SSIM) has received acclaim due to its ability to produce results on a par with Human Visual System. However, experimental results indicate that noise and blur seriously degrade the perfor...

The need to obtain objective values of the quality of distorted images with respect to the original is fundamental in multimedia and image processing applications. It is generally required that this value correlates well with the human vision system (HVS). In spite of the properties and the general use of themean square error (MSE) measurement, this has a poor correlation with HSV, which has le...