Blockiness in JPEG-coded images

  title={Blockiness in JPEG-coded images},
  author={Lydia M. J. Meesters and J. Martens},
  booktitle={Electronic Imaging},
In two experiments, dissimilarity data and numerical scaling data were obtained to determine the underlying attributes of image quality in baseline sequential JPEG coded imags. Although several distortions were perceived, i.e., blockiness, ringing and blur, the subjective data for all attributes where highly correlated, so that image quality could approximately be described by one independent attribute. We therefore proceeded by developing an instrumental measure for one of these distortions, i… Expand
A single-ended blockiness measure for JPEG-coded images
A single-ended blockiness measure is proposed, i.e., one that uses only the coded image, based on detecting the low-amplitude edges that result from blocking and estimating the edge amplitudes. Expand
Role of image dissimilarity in image quality models
This paper compares the performance of a number of representative instrumental models for image Dissimilarity with respect to their ability to predict both image dissimilarity and image quality, as perceived by human subjects. Expand
Predicted and perceived quality of bit-reduced gray-scale still images
It will be demonstrated in this chapter how a small image set of scenes can be selected for the purpose of discriminating between the predictions of instrumental quality measures, and the usefulness of quality measures can be ascertained from a small, well chosen set of images. Expand
Comparison of MPEG-2 and AVC coding on synthetic test materials
Three quality metrics are described: a standard peak-signal-to-noise measure, a new metric of edge-blurring, and another of added-edge-energy, as applied to the NIST synthetic clips, which confirm an approximate doubling of compression efficiency between two commercial codecs. Expand
Mosquito noise in MPEG-compressed video: test patterns and metrics
A new synthetic test pattern of moving spirals or circles is described which generates mosquito noise (MN) under Motion Pictures Expert Group (MPEG) compression and it is found that the GOP structure defines the periodicities of the MN. Expand
30.4: Effect of Image Compression on Image Quality
By a comparison of the image quality of JPEG compressed images with images with various distortions, a good description is obtained for the image quality of these images with the SQRI method. TheExpand
Impairment metrics for digital video and their role in objective quality assessment
Three important metrics, blocking artifacts level, ringing artifact level, and corner outlier artifact level have been used to create a combined impairment metric, which appears to be key components for future no- reference type of objective quality metrics. Expand
Predictive absolute-moment block truncation coding for image compression
The proposed scheme is based on selectively predicting the reconstruction values of a block based on the corresponding values in the neighboring blocks, as well as predicting the bitplane from the bitplanes of the corresponding blocks in other color components. Expand
Distance adaptive picture quality of natural images
This document summarizes current capabilities, research and operational priorities, and plans for further studies that were established at the 2015 USGS workshop on quantitative hazard assessments of earthquake-triggered landsliding and liquefaction in the Central American region. Expand
DifScal: A tool for analyzing difference ratings on an ordinal category scale
  • M. Boschman
  • Mathematics, Medicine
  • Behavior research methods, instruments, & computers : a journal of the Psychonomic Society, Inc
  • 2001
An algorithm for analyzing difference scaling results is described, and an additional feature of DifScal is that it is suited to analyze incomplete data. Expand


Perceptual characterization of images degraded by blur and noise: model.
A psychometric space in which the positions of the images are determined by objective measures on the images, and it is shown that the attributes and the quality thus estimated correlate well with the perceived attributes and quality. Expand
Image quality measures and their performance
Although some numerical measures correlate well with the observers' response for a given compression technique, they are not reliable for an evaluation across different techniques, and a graphical measure called Hosaka plots can be used to appropriately specify not only the amount, but also the type of degradation in reconstructed images. Expand
JPEG still image compression
  • standard, van Nostrand Reinhold,
  • 1993
Image quality: a multidimensional problem