Image pre-compensation to facilitate computer access for users with refractive errors

Alonso, Miguel Ángel Verdugo; Barreto, Armando; Cremades, J. Gualberto; Jacko, JA; Adjouadi, Malek

doi:10.1080/01449290412331327456

Cited by 23 publications

(19 citation statements)

References 11 publications

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“…Thus, for an eye free of aberrations, each point in the object is represented as a point on the retina. Ideally then, when a human views a computer screen, each pixel can be thought of as a point-source of light, and the corresponding image of that pixel is projected onto the retina [2].…”

Section: Current Researchmentioning

confidence: 99%

“…Equations 1, 2, and 3 describe the method by which to obtain the PSF, PSF(x,y), from the Wavefront aberration function, W(x,y) [2,4,9,10,12],…”

Section: Current Researchmentioning

confidence: 99%

“…The aim of the pre-compensation proposed in this paper is essentially the same; "modify the intended display image in a way that is opposite to the effect of the wavefront aberration of the eye. Once this is achieved, the result is displayed to the viewer so that the wavefront aberration in the viewer's eye will "cancel" the pre-compensation, resulting in the projection of an undistorted version of the intended image on the retina" [2]. However, the means towards achieving the pre-compensation proposed here overcomes some of the limitations of the previous attempt at an all-digital, software solution.…”

Section: Introductionmentioning

confidence: 96%

“…Although these methods are effective, their complexity and high cost render them impractical for everyday use [2]. More recently, an all-digital solution has been proposed [2]. In contrast with the optical correction of visual limitations, this approach is based on modifying the image at its source, i.e., applying image processing modifications on the image to be displayed on-screen before it is shown to the user, based on the knowledge of his/her own wavefront aberration function.…”

Section: Introductionmentioning

confidence: 99%

“…Although these methods are effective, their complexity and high cost render them impractical for everyday use [2]. More recently, an all-digital solution has been proposed [2].…”

Section: Introductionmentioning

confidence: 99%

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Improving Computer Interaction for Users with Visual Acuity Deficiencies through Inverse Point Spread Function Processing

Alonso

Barreto

Jacko³

et al.

Proceedings. IEEE SoutheastCon, 2005.

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Human beings take advantage of their high visual acuity to perform many daily activities required of them. Specifically, normal visual acuity is a pre-requisite for proper usage of most contemporary Graphic User Interfaces. The most common forms of visual acuity loss are myopia, hyperopia, and astigmatism. Contact lenses or glasses can easily correct these simple visual aberrations. There exist, however, more complex aberrations that cannot be easily remedied by such means. These "highorder" aberrations are modeled through what is known as the Point Spread Function (PSF) of the human eye. The PSF can be obtained indirectly through the wavefront aberration function of the human eye, currently accessible through wavefront analyzers. Thus, it is feasible that with the knowledge of the PSF, digital images could be altered according to a transformation opposite to the one they suffer in an aberrated eye. Consequently, when they are displayed to the user, he /she will perceive them undistorted. This paper presents an image processing approach, based on deconvolution of the PSF from the intended computer images that achieves this objective. The theoretical foundation of the approach is introduced along with simulation results using actual PSFs from subjects.

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Section: Current Researchmentioning

confidence: 99%

“…Equations 1, 2, and 3 describe the method by which to obtain the PSF, PSF(x,y), from the Wavefront aberration function, W(x,y) [2,4,9,10,12],…”

Section: Current Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

“…Although these methods are effective, their complexity and high cost render them impractical for everyday use [2]. More recently, an all-digital solution has been proposed [2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improving Computer Interaction for Users with Visual Acuity Deficiencies through Inverse Point Spread Function Processing

Alonso

Barreto

Jacko³

et al.

Proceedings. IEEE SoutheastCon, 2005.

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A Windows‐based interface for teaching image processing

Ayala

Adjouadi

Cabrerizo

et al. 2010

Comp Applic In Engineering

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The use of image processing in research represents a challenge to the scientific community interested in its various applications but is not familiar with this area of expertise. In academia as well as in industry, fundamental concepts such as image transformations, filtering, noise removal, morphology, convolution/deconvolution among others require extra efforts to be understood. Additionally, algorithms for image reading and visualization in computers are not always easy to develop by inexperienced researchers. This type of environment has lead to an adverse situation where most students and researchers develop their own image processing code for operations which are already standards in image processing, a redundant process which only exacerbates the situation. The research proposed in this article, with the aim to resolve this dilemma, is to propose a user-friendly computer interface that has a dual objective which is to free students and researchers from the learning time needed for understanding/applying diverse imaging techniques but to also provide them with the option to enhance or reprogram such algorithms with direct access to the software code. The interface was thus developed with the intention to assist in understanding and performing common image processing operations through simple commands that can be performed mostly by mouse clicks. The visualization of pseudo code after each command execution makes the interface attractive, while saving time and facilitating to users the learning of such practical concepts. ß

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