Digitally enhanced imager for the visually impaired

Details Digitally enhanced imager for the visually impaired Digitally enhanced imager for the visually impaired

1992-04-29

1993-11-30

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 50, 382 1, 358 94, 358168, G06K 940, G06K 938, H04N 557

Patent

active

052673316

ABSTRACT:
The invention consists of an apparatus and method for creating high resolution, high contrast images to enhance the functional vision of visually impaired individuals. The apparatus includes an image scanning device, a digital image enhancement device and a high resolution monitor. Video images are enhanced in real time by converting an analog input signal to a digital output. The digital output is processed in a contrast selection device, stored in high speed memory, reformed into an output image and displayed on the high resolution monitor using high scan rates. The enhancement of images containing text substantially eliminates "grey" transitions between the text and the background to improve resolution. By increasing the contrast between the text and the background as well as user selectable enlargement and character spacing by magnifying or scaling of the digital video data, the functional vision of visually impaired individuals is improved.

REFERENCES:
patent: 4628362 (1986-12-01), Waehner
patent: 4642694 (1987-02-01), Yamagishi et al.
patent: 4774580 (1988-09-01), Miyasako
patent: 4817622 (1989-04-01), Pennypacker et al.
patent: 5068731 (1991-11-01), Takeuchi
patent: 5107254 (1992-04-01), Choi
Symposium Paper entitled "Limitations of Image Enhancement for the Visually Impaired" by Eli Peli: Jul. 16, 1991 pp. 32-41.
Symposium Paper entitled "Obstacles Encountered in the Development of the Low Vision Enhancement System"]by Robert W. Massof and Douglas L. Richman Jun. 3, 1991 pp. 15-24.

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