Effect of Gate and Shutter Characteristics on Screen Image Quality

1957 ◽  
Vol 66 (10) ◽  
pp. 623-627 ◽  
Author(s):  
Willy Borberg
Keyword(s):  
Image Quality ◽  
Screen Image

Human Factors Assessment of ISO 9241-7, “Requirements for Displays with Reflections”

1998 ◽  
Vol 42 (22) ◽  
pp. 1560-1564
Author(s):  
Gary S. Olacsi ◽  
Joy Kempic ◽  
Robert J. Beaton
Keyword(s):  
Image Quality ◽  
Human Factors ◽  
Specular Reflection ◽  
Visual Display ◽  
Office Work ◽  
Luminance Ratio ◽  
Screen Image ◽  
Specular Reflections ◽  
Degrade Image Quality ◽  
Reading Text

This work evaluated the recently-published ISO 9241-7 “Ergonomic requirements for office work with visual display terminals (VDTs) - Part 7: Requirements for display with reflections” technical standard in terms of perceived image quality judgments for CRT displays. The effects of five illumination conditions and two screen contrast polarities on image quality were assessed for seven CRT/anti-reflection filter configurations. Participants judged the image quality of the displays after reading text passages on the screen. Image quality judgments then were compared to ISO 9241-7 compliance classifications, as well as to two metrics inherent to the standard: screen image luminance ratio and specular reflection luminance ratio. The findings of this work (along with Kempic, Olacsi, and Beaton, 1998) contribute to a human factors justification of ISO 9241-7 and point up several shortcomings in this international standard. In particular, the findings indicate that specular reflections from CRTs degrade image quality more than do diffuse reflections, and, therefore, the importance of specular reflections is understated in the ISO 9241-7 standard.

MTFA as a measure for computer display screen image quality

Displays ◽  
1990 ◽  
Vol 11 (4) ◽  
pp. 186-192 ◽  
Author(s):  
Yingduo Feng ◽  
Olov Östberg ◽  
Björn Lindström
Keyword(s):  
Image Quality ◽  
Screen Image

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

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