Objective measurements of image quality

Objective measurements of image quality.

Tissue harmonic imaging (THI) and compound imaging have been reported clinically to improve contrast resolution, tissue differentiation and overall image quality. However, there have been limited studies to date to quantify objectively the improvements in image quality achieved with these new imaging techniques. The aim of this study was to quantify differences in image quality that exist betwe...

Subjective Vs Objective Image Quality

Image quality demands have been investigated for different applications of stereoscopic evaluation. For that purpose, the quality of image pairs was judged by experienced stereo operators in subjective sc ales for contrast, sharpness, granularity, interpretability and overall quality. The judgment was made in real working situations with the images oriented in stereo instruments. The result sho...

Survey of Objective Video Quality Measurements

Perceptual quality and objective quality measurements of compressed videos

This paper firstly presents a study of video quality for H.264 compressed videos compared to MPEG-4 (simple profile) from a perceptual point of view. Traditionally, peak signal-to-noise ratio (PSNR) has been used to represent the quality of a compressed video sequence. However, PSNR has been found to correlate poorly with subjective quality ratings, particularly at much lower bitrates and low f...

Understanding QMM Objective Picture Quality Measurements

Digital television broadcast systems based on MPEG can compress video information from hundreds of megabits to less than 5 Mbps with very little user perceived picture quality degradation. This is the case as long as everything goes well. However, given the complexity of today’s digital television broadcast chain, problems can give rise to poor picture quality being delivered to the end user. T...