Methods for Evaluation of Digital Television Picture Quality

1996 ◽  
Author(s):  
William Y. Zou ◽  
Philip J. Corriveau
Keyword(s):  
Digital Television ◽  
Picture Quality

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.

scholarly journals Adaptive power link adaptation on DVB-T system based on picture quality feedback

2019 ◽  
Vol 9 (4) ◽  
pp. 3121
Author(s):  
Tubagus Maulana Kusuma ◽  
Randy Rahmanto ◽  
Emy Haryatmi
Keyword(s):  
Image Quality ◽  
Service Provider ◽  
Link Adaptation ◽  
Reference Image ◽  
Digital Television ◽  
Transmission Power ◽  
Picture Quality ◽  
Quality Metric ◽  
Quality Feedback ◽  
T System

<p>In digital television systems such as DVB-T, service provider has difficulties to observe the quality of picture reception in the viewers’ television. This is due to the unavailability of quality feedback sent from viewers’ devices to the service provider. Therefore, this research proposes link adaptation method in DVB-T system based on image quality measurement at recipient side, so that service provider may adjust the transmission power in real-time to improve the image quality. Quality metric used in this research is human perception- based no-reference image quality metric, which does not need the presence of the reference frame. The quality assessment is focused on the severeness of blocking artifact, which is the dominant artifacts in MPEG video. The numerical results have shown that power adaptation could maintain good picture quality as well as transmission power efficiency at the same time on the digital television transmission system. The proposed scheme is also suitable for other DVB system as well as various digital television system standards.</p>

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

Digital Television

IEE Review ◽  
1990 ◽  
Vol 36 (11) ◽  
pp. 432
Author(s):  
Peter L. Mothersole
Keyword(s):  
Digital Television
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