Objective Measurement of Compressed Digital Television Picture Quality

SMPTE Journal ◽  
1998 ◽  
Vol 107 (6) ◽  
pp. 348-352 ◽  
Author(s):  
Ichiro Yuyama ◽  
Yukihiro Nishida ◽  
Eisuke Nakasu
Keyword(s):  
Objective Measurement ◽  
Digital Television ◽  
Picture Quality

DCTlab: Educational Software for Still Image Compression and its Application in a Digital Television Course

2001 ◽  
Vol 38 (3) ◽  
pp. 187-198 ◽  
Author(s):  
Mislav Grgić ◽  
Sonja Grgić ◽  
Branka Zovko-Cihlar
Keyword(s):  
Image Compression ◽  
Learning Outcomes ◽  
Discrete Cosine Transform ◽  
Educational Software ◽  
Digital Television ◽  
Picture Quality ◽  
Still Image ◽  
Moving Images ◽  
Spatial Redundancy ◽  
Current Standards

Current standards for the compression of still and moving images use Discrete Cosine Transform (DCT) to remove spatial redundancy in images. Students specialising in image and video system engineering need to know why DCT is important in their field of interest and to understand the influence of DCT-based image compression on picture quality. Therefore, we have developed educational software, called DCTlab, that helps students to analyse DCT application in still image compression systems. This paper describes software characteristics, its application in a digital television course and learning outcomes.

Picture Quality Judgments in a Digital Television System

1974 ◽  
Vol 16 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Stanley M. Soliday ◽  
James A. Gardner
Keyword(s):  
Response Surface ◽  
Communication Systems ◽  
Digital Communication ◽  
Sampling Frequency ◽  
Digital Television ◽  
Code Length ◽  
Picture Quality ◽  
Television System ◽  
Digital Communication Systems

Digital communication systems distort their signals as a consequence of the digitization process. The distortions are related to the code length and sampling frequency of the system. The present study assessed viewers' responses to these variables by using simulated digital television. To do this, 24 subjects rated the quality of pictures distorted by several combinations of the variables. A response surface generated from the ratings showed that the ratings were affected by both variables, but most profoundly by code length. Interpretation of the surface's contours from the perspective of system costs revealed that costs should be considered solely from the standpoint of code length.

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