We propose a fast, yet simple algorithm to find the Region of Interest (ROI) from a compressed MPEG video bitstream, with partial decoding. We have used the properties of the Human Visual System (HVS), applied in the DCT domain, to extract the ROIs. Though a lot of work has been done to obtain ROIs in images based on the HVS, all these systems work in the pixel domain. However, finding the ROIs...

An adaptive watermarking algorithm is presented which exploits a biorthogonal wavelets-based human visual system (HVS) and a Fuzzy Inference System (FIS) to protect the copyright of images in learning object repositories. Specifically, the HVS relies on the linear-phase property of biorthogonal wavelet filters (symmetric wavelets) in order to efficiently extract the masking information, while t...

RATIONALE AND OBJECTIVE The set partitioning in hierarchical trees (SPIHT) wavelet image compression algorithm with the human visual system (HVS) quantization matrix was investigated using x-ray coronary angiograms. We tested whether the HVS quantization matrix for the SPIHT wavelet compression improved computer model/human observer performance in a detection task with variable signals compared...

Abstract The Action Governor (AG) is a supervisory scheme augmenting nominal control system in order to enhance the system's safety and performance. It acts as an action filter, monitoring commands generated by policy adjusting ones that might lead undesirable behavior. In this article, we present approach based on learning developing AG for autonomous vehicle (AV) decision policies improve the...

I n MRI of patients with acute ischemic stroke, use of fluidattenuated inversion recovery (FLAIR) sequences has recently gained importance as a tool to assess lesion age. A separate finding on FLAIR images has been termed “hyperintense vessels” (HVs) and describes hyperintensities corresponding to an arterial course most conspicuous in the sylvian fissure and cortical sulci. Most likely, HVs re...

The aim of steganography is to conceal the very existence of hidden communication, so imperceptibility is the primary demand. However there are short of corresponding evaluation methods. Most researchers still use Peak-Signal-to-Noise Ratio (PSNR) for their imperceptibility evaluation, while ignoring the speciality of steganography. In this paper, firstly, we present an objective method of impe...

This paper proposed a novel blind color digital watermarking algorithm based on Integer Discrete Wavelet Transform (IDWT) and Human Visual System (HVS). Firstly, color watermark image was processed into one dimension digital information, and color host image was converted into YIQ color space. Then, according to the features of HVS, encrypted watermark was embedded adaptively into the Y luminan...

This article deals with evaluation of image quality by various methods and comparison of their results. Generally, there are several ways how to assess image quality. Three main approaches are: subjective testing, objective testing and image quality evaluation using a human visual system model (HVS). The subjective testing is based on human perception, the objective testing on a mathematical co...

1315 be generally advocated, however, it would be necessary to study larger groups of patients and controls to determine the sensitivity and specificity ofthe test. Ironically, the diagnostic ( ‘gold”) standard against which the test results would be weighed would be clinical evaluation with reproduction of symptoms with hyperventilation. In the final analysis, therefore, I believe that the dia...