Image Quality Loss and Compensation for Visually Impaired Observers

Image enhancement for the visually impaired

Model observers for assessment of image quality.

Image quality can be defined objectively in terms of the performance of some "observer" (either a human or a mathematical model) for some task of practical interest. If the end user of the image will be a human, model observers are used to predict the task performance of the human, as measured by psychophysical studies, and hence to serve as the basis for optimization of image quality. In this ...

Image enhancement for the visually impaired. Simulations and experimental results.

Digital image enhancement has been proposed as an aid for the visually impaired. The capability of two enhancement techniques to improve recognition of images by patients with central scotoma or cataracts was evaluated using image-processing simulations and direct patient testing. Enhancements and simulations were based on measurements of contrast sensitivity loss for patients with macular dise...

MPEG-based image enhancement for the visually impaired

Avni Vora Eli Peli, MEMBER SPIE Harvard Medical School The Schepens Eye Research Institute 20 Staniford Street Boston, Massachusetts 02114-2500 E-mail: [email protected] Abstract. An MPEG-based image contrast enhancement algorithm for people with low vision is presented. Contrast enhancement is achieved by modifying the interand intra-quantization matrices in the MPEG decoder during th...

A Stereo Image Processing System for Visually Impaired

This paper presents a review on vision aided systems and proposes an approach for visual rehabilitation using stereo vision technology. The proposed system utilizes stereo vision, image processing methodology and a sonification procedure to support blind navigation. The developed system includes a wearable computer, stereo cameras as vision sensor and stereo earphones, all moulded in a helmet. ...