
Proceedings Paper
Visual acuity and contrast sensitivity with compressed motion videoFormat | Member Price | Non-Member Price |
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Paper Abstract
Video of Visual Acuity (VA) and Contrast Sensitivity (CS) test charts in a complex background was recorded using a
CCD camera mounted on a computer-controlled tripod and fed into real-time MPEG2 compression/decompression
equipment. The test charts were based on the Triangle Orientation Discrimination (TOD) test method and contained
triangle test patterns of different sizes and contrasts in four possible orientations. In a perception experiment, VA and
CS thresholds at the 75% correct level were obtained for three camera velocities (0, 1.0 and 2.0 deg/s or 0, 4.1 and 8.1
pix/frame) and four compression rates (no compression, 4Mb/s, 2Mb/s and 1 Mb/s). VA is shown to be rather robust to
any combination of motion and compression. CS however dramatically decreases when motion is combined with high
compression ratios. The data suggest that with the MPEG2 algorithm the emphasis is on the preservation of image detail
at the cost of contrast loss.
Paper Details
Date Published: 22 April 2009
PDF: 14 pages
Proc. SPIE 7300, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX, 730006 (22 April 2009); doi: 10.1117/12.819948
Published in SPIE Proceedings Vol. 7300:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX
Gerald C. Holst, Editor(s)
PDF: 14 pages
Proc. SPIE 7300, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX, 730006 (22 April 2009); doi: 10.1117/12.819948
Show Author Affiliations
Piet Bijl, TNO Defense, Security and Safety (Netherlands)
Sjoerd C. de Vries, TNO Defense, Security and Safety (Netherlands)
Published in SPIE Proceedings Vol. 7300:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX
Gerald C. Holst, Editor(s)
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