Contrast detection in halftone image

Xiaofan Feng

doi:10.1117/12.274511

3 June 1997 Contrast detection in halftone image

Xiaofan Feng

Proceedings Volume 3016, Human Vision and Electronic Imaging II; (1997) https://doi.org/10.1117/12.274511
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

In this paper, we describe a visual experiment to measure the contrast detection threshold of both halftone image and continuous tone image. A continuous tone sinusoidal grating was halftoned with a classical 45 degree dot screen. A calibrated CRT monitor was used to display images. The observers were asked to make a forced choice that whether the displayed image contains a grating pattern. The contrast detection threshold was determined using Probit analysis. The threshold elevation, the ratio of contrast threshold for halftone grating to continuous tone grating, was calculated based on the measured contrast detection threshold. It was found that the threshold elevation strongly depends on halftone dot frequency. At a high halftone frequency, there is little difference in the measured contrast detection threshold between continuous tone grating and halftone grating, but at a lower halftone frequency, the detection threshold is significantly higher for halftone grating than that of the continuous tone grating. The threshold elevation is much higher for the gratings oriented at 45 degree where the peaks of the halftone frequency lies. A multiple channel vision model was implemented to predict the visual difference for both continuous tone and halftone image. The model correctly predicted the grating detection threshold of continuous tone grating, but it fails to predict the threshold elevation due to halftone.

Citation Download Citation

Xiaofan Feng "Contrast detection in halftone image", Proc. SPIE 3016, Human Vision and Electronic Imaging II, (3 June 1997); https://doi.org/10.1117/12.274511

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KEYWORDS

Halftones

Visual process modeling

Visualization

Image quality

Calibration

Contrast sensitivity

CRTs

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