Identification of image attributes that are most affected with changes in displayed image size

Park, Jae Young; Triantaphillidou, Sophie; Jacobson, Ralph E.

doi:10.1117/12.805844

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…Results from the contrast matching experiment showed that perceived contrast was increased when image size was decreased and were consistent with results from the sharpness matching experiment 7 . Observations from matching the contrast of the small version image to that of the large version image, resulted in an average change in tone reproduction of 0.087 gamma (or 2.0 steps in the gamma scale), with an average standard error of mean (SEM) of 0.030.…”

Section: Results From the Psychophysical Testssupporting

confidence: 78%

“…Changes in image size, or the viewing distance have been reported to lead to changes in various aspects of image appearance [2][3][4][5][6][7] .A study concerning the identification of image attributes that are most affected by changes in the displayed image size was previously carried out by the authors 7 . It considered various image attributes, including both spatial and color aspects and identified sharpness and contrast to be the two most affected attributes by changes in the displayed image size.…”

Section: Introductionmentioning

confidence: 99%

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Just noticeable differences in perceived image contrast with changes in displayed image size

2014

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An evaluation of the change in perceived image contrast with changes in displayed image size was carried out. This was achieved using data from four psychophysical investigations, which employed techniques to match the perceived contrast of displayed images of five different sizes. A total of twenty-four S-shape polynomial functions were created and applied to every original test image to produce images with different contrast levels. The objective contrast related to each function was evaluated from the gradient of the mid-section of the curve (gamma). The manipulation technique took into account published gamma differences that produced a just-noticeable-difference (JND) in perceived contrast. The filters were designed to achieve approximately half a JND, whilst keeping the mean image luminance unaltered. The processed images were then used as test series in a contrast matching experiment. Sixty-four natural scenes, with varying scene content acquired under various illumination conditions, were selected from a larger set captured for the purpose. Results showed that the degree of change in contrast between images of different sizes varied with scene content but was not as important as equivalent perceived changes in sharpness 1 .

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Section: Results From the Psychophysical Testssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Just noticeable differences in perceived image contrast with changes in displayed image size

2014

Self Cite

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show abstract

“…A study concerning the identification of image attributes that are most affected by changes in the displayed image size was previously carried out by the authors [6]. It considered various image attributes, including both spatial and color and identified sharpness and contrast to be the two most affected attributes by changes in the displayed image size, and hue the least affected attribute.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of perceived image sharpness with changes in the displayed image size

et al. 2012

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In this paper an evaluation of the degree of change in the perceived image sharpness with changes in displayed image size was carried out. This was achieved by collecting data from three psychophysical investigations that used techniques to match the perceived sharpness of displayed images of three different sizes. The paper first describes a method employed to create a series of frequency domain filters for sharpening and blurring. The filters were designed to achieve one just-noticeable-difference (JND) in quality between images viewed from a certain distance and having a certain displayed image size (and thus angle of subtense). During psychophysical experiments, the filtered images were used as a test series for sharpness matching. For the capture of test-images, a digital SLR camera with a quality zoom lens was used for recording natural scenes with varying scene content, under various illumination conditions. For the psychophysical investigation, a total of sixty-four original test-images were selected and resized, using bi-cubic interpolation, to three different image sizes, representing typical displayed sizes. Results showed that the degree of change in sharpness between images of different sizes varied with scene content.

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Identification of image attributes that are most affected with changes in displayed image size

Cited by 2 publications

References 8 publications

Just noticeable differences in perceived image contrast with changes in displayed image size

Just noticeable differences in perceived image contrast with changes in displayed image size

Evaluation of perceived image sharpness with changes in the displayed image size

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