Results 211 to 220 of about 452,773 (262)
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International Symposium on VIPromCom Video/Image Processing and Multimedia Communications, 2003
This paper is devoted to subjective and objective tests of image quality. The images were processed using different compressing algorithms (JPEG, KLT, Lura-wavelet) with compression ratio up to 100. After decompression they were tested on the quality changes. At first the subjective image quality test (DSCQS) was used.
D. Van der Weken +2 more
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This paper is devoted to subjective and objective tests of image quality. The images were processed using different compressing algorithms (JPEG, KLT, Lura-wavelet) with compression ratio up to 100. After decompression they were tested on the quality changes. At first the subjective image quality test (DSCQS) was used.
D. Van der Weken +2 more
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Displays, 1992
Abstract This report describes two procedures that aim to evaluate image quality. The first is an implementation of the ISO performance-based for visual displays. Subjects are presented with random characters presented in five blocks on the screen and asked to identify each character.
D. Travis, T.F.M. Stewart, C. Mackay
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Abstract This report describes two procedures that aim to evaluate image quality. The first is an implementation of the ISO performance-based for visual displays. Subjects are presented with random characters presented in five blocks on the screen and asked to identify each character.
D. Travis, T.F.M. Stewart, C. Mackay
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Evaluation of Xeroradiographic Image Quality
Radiology, 1976A theory of edge enhancement has been developed to describe xeroradiographic images of linear step objects. The theory is shown to give an accurate description of the relationship between edge enhancement, subject contrast, radiation exposure, selenium charging potential and developer bias potential.
G H, Zeman, G U, Rao, F A, Osterman
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Evaluation of radiographic image quality
Physics in Medicine & Biology, 1972The quality of radiographic images recorded by screen-film systems depends on the contrast and shape of the image detail which is of diagnostic interest. As a first approximation, the complex world of radiographic detail can be divided into two categories, one containing high contrast, inherently sharp detail (Class I), and the other containing low ...
Kurt Rossmann +2 more
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Evaluation of image quality in tomographic imaging
Physics in Medicine & Biology, 1977Modulation Transfer Functions (MTF) for tomographic imaging with linear, circular, hypocycloidal and spiral motion are given. They may be determined experimentally from tomographs of slits or line pair test patterns. In some cases calculation of the MTF from the blur pattern by Fourier transformation is possible.
M, Wolf, A, Stargardt, W, Angerstein
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Ultrasound image quality evaluation
4th International IEEE EMBS Special Topic Conference on Information Technology Applications in Biomedicine, 2003., 2003The objective of this work was to evaluate the image quality of two different ultrasound image scanners before and after de-speckle filtering. The evaluation was made by statistical and texture analysis, as well as by optical perception by two vascular experts on 20 ultrasound images of carotid artery.
Loizou, Christos P. +13 more
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Image quality evaluation of infrared image
SPIE Proceedings, 2005According to the imaging procedure an infrared picture include an object image, a background image and a noise image. The object image and the background image are main body of an infrared image; noise image is the disturbance on the main body. This paper discusses the infrared image quality from three aspects: information capacity, image detail and ...
Chun-mei Xu +3 more
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Image quality evaluation of breast tomosynthesis
2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA), 2016Digital breast tomosynthesis provides significant opportunities in both diagnostic and cancer screening. It gives high quality image and overcomes some inherent limitations of the traditional 2D digital mammography due to tissues overlapping which makes difficult to detect cancers. Unfortunately, the quality of tomographic images is directly related to
ANDRIA, Gregorio +4 more
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Evaluating image quality—A new formulation
Computers in Biology and Medicine, 1972Abstract A new formulation of the image evaluation problem is presented which provides a reasonable approach for any given application. The approach consists of determining if one image can be judged “better” than another and, if so, how much better. The formulation is in terms of decision theory and requires that classes of images of similar quality
E L, Hall, S J, Dwyer
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Telecine calibration and image quality evaluation
47th International Symposium ELMAR, 2005., 2005In this paper video signal level of the filmed material is measured on telecine with respect to a TAF (Telecine Analysis Film) as reference value. On telecine calibrated according to TAF, projection of filmed material from shooting location need same corrections.
Grgić, Sonja, Lukičić, Tomislav
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