Adaptation to blur

Michael A. Webster; Shernaaz M. Webster; Jennifer MacDonald; Shrikant R. Bahradwadj

doi:10.1117/12.429515

8 June 2001 Adaptation to blur

Michael A. Webster, Shernaaz M. Webster, Jennifer MacDonald, Shrikant R. Bahradwadj

Proceedings Volume 4299, Human Vision and Electronic Imaging VI; (2001) https://doi.org/10.1117/12.429515
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

Blur is an intrinsic property of the retinal image that can vary substantially in natural viewing. We examined how processes of contrast adaptation might adjust the visual system to regulate the perception of blur. Observers viewed a blurred or sharpened image for 2-5 minutes, and then judged the apparent focus of a series of 0.5-sec test images interleaved with 6-sec of readaptation. A 2AFC staircase procedure was used to vary the amplitude spectrum of successive test to find the image that appeared in focus. Adapting to a blurred image causes a physically focused image to appear too sharp. Opposite after-effects occur for sharpened adapting images. Pronounced biases were observed over a wide range of magnitudes of adapting blur, and were similar for different types of blur. After-effects were also similar for different classes of images but were generally weaker when the adapting and test stimuli were different images, showing that the adaptation is not adjusting simply to blur per se. These adaptive adjustments may strongly influence the perception of blur in normal vision and how it changes with refractive errors.

Citation Download Citation

Michael A. Webster, Shernaaz M. Webster, Jennifer MacDonald, and Shrikant R. Bahradwadj "Adaptation to blur", Proc. SPIE 4299, Human Vision and Electronic Imaging VI, (8 June 2001); https://doi.org/10.1117/12.429515

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