Generic and customised digital image enhancement filters for the visually impaired

Leat, Susan J.; Omoruyi, Gloria; Kennedy, Andrew; Jernigan, E.

doi:10.1016/j.visres.2005.01.028

Cited by 22 publications

(41 citation statements)

References 35 publications

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“…Modern e‐LVAs can embed digital sight enhancement algorithms that have been proven effective in laboratory settings for decades . A 2015 review of 37 research papers highlighted the benefit of various image processing techniques for the visually impaired, albeit with inconsistent preferences between people .…”

Section: Introductionmentioning

confidence: 99%

Benefit of an electronic head‐mounted low vision aid

Crossland

Starke

Imielski³

et al. 2019

Ophthalmic Physiologic Optic

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Purpose To evaluate the efficacy of electronic head‐mounted low vision aid (e‐LVA) SightPlus (GiveVision, UK, givevision.net) and to determine which people with low vision would see themselves likely using an e‐LVA like this. Methods Sixty participants with low vision aged 18 to 93 used SightPlus during an in‐clinic study session based on a mixed methods design. Visual acuity (ETDRS), contrast sensitivity (Pelli‐Robson) and reading performance (MNREAD) were measured binocularly at baseline (no device), with the device in ‘normal’ mode (zoom only), and with preferred enhanced mode (zoom and one of four digital image enhancements). At the end of the session, a short questionnaire recorded willingness to use an e‐LVA like SightPlus, potential use cases, positive/negative comments and adverse effects. Results Binocular distance visual acuity improved significantly by 0.63 logMAR on average (p < 0.0001) to 0.20 logMAR. Contrast sensitivity improved significantly by 0.22 log units (p < 0.0001) to 1.21 log units with zoom only and by 0.40 log units to 1.37 log units with zoom and preferred image enhancement. Reading performance improved significantly for near visual acuity and critical print size (p < 0.015), although reading speed significantly decreased (p < 0.0001). Nearly half (47%) of the participants indicated they would use an e‐LVA like SightPlus, especially for television, reading and entertainment (e.g. theatre). Multivariate logistic regression showed that proportion of lifetime affected by sight loss, baseline contrast sensitivity and use of electronic LVAs explained 41% of the variation in willingness to use. Conclusions SightPlus improves visual function in people with low vision and would be used in its current form by one half of the people who tried it. Adverse effects were infrequent and resolved when the device was removed. Future work should focus on comparing e‐LVAs through repeatable real‐world tasks and impact on quality of life.

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Section: Introductionmentioning

confidence: 99%

Benefit of an electronic head‐mounted low vision aid

Crossland

Starke

Imielski³

et al. 2019

Ophthalmic Physiologic Optic

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“…Evidently, there are more complex factors at play for many types of low vision, which cannot be alleviated simply by way of image enhancement. In [16], an investigation is conducted to study, compare and ascertain the effectiveness of a range of generic image enhancement filters with regard to the improvement of the perceived visibility of coloured digital nature images. They conclude that there is no one-size-fits-all filter that can improve all sorts of images (e.g., indoor, out-door, sports) for the visually impaired.…”

Section: Image Enhancement For the Visually Impairedmentioning

confidence: 99%

A new approach to image enhancement for the visually impaired

Gao¹,

Loomes²

2016

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“…With the fast progress in image processing technology, new possibilities for partial compensation of low contrast and low color sensitivity, as well as other shortcomings typical of impaired vision, are now available in real time processing. The mere application of contrast enhancement algorithm based on simple histogram stretching technique, already results in a noticeable improvement in the perceived image quality for AMD patients [1]. More significant improvement can be accomplished by sophisticated methods of image enhancement, based on e.g.…”

Section: Low Vision Image Enhancementmentioning

confidence: 99%

Image enhancement methods for the visually impaired

Bogillo

Efron

2007

Applications of Digital Image Processing XXX

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A novel image enhancement algorithm which simplifies image content and enhances image contrast and color saturation is proposed. The capability to improve the image discriminability by patients with central scotoma was evaluated using computer simulation. Image enhancement and discriminability simulation were based on modeling of contrast sensitivity loss for the low vision patient with central scotoma size of ±10 degrees of the visual field. The results are compared with other methods of image enhancement. The simulations results suggest that the proposed method performs well compared with other tested algorithms, showing significant increase in the average image discriminability, measured using the d' parameter.

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Generic and customised digital image enhancement filters for the visually impaired

Cited by 22 publications

References 35 publications

Benefit of an electronic head‐mounted low vision aid

Benefit of an electronic head‐mounted low vision aid

A new approach to image enhancement for the visually impaired

Image enhancement methods for the visually impaired

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