Multi-resolution image scanner

Details Multi-resolution image scanner Multi-resolution image scanner

1992-01-17

1993-11-30

Razavi, Michael T.

Image analysis

Histogram processing

For setting a threshold

382 68, 382 50, 358462, 35821311, 2502081, G06K 900, G06K 938, H04N 314

Patent

active

052673359

ABSTRACT:
An image scanner is provided that receives light reflected from a same position on a document by first, second, and third one-dimensional image sensors arranged in parallel. The second image sensor is a high-resolution image sensor comprising a plurality of photocells, which is disposed between and in a spaced-apart relationship with the first and third one-dimensional image sensors which are each low-resolution image sensors comprising photocells which are larger in size than the photocells of the second one-dimensional image sensor. Electrical image output signals from the first and third low-resolution image sensors are added, and any high-frequency components in the added signal are removed by a low-pass filter for producing signal data relating to the mean brightness of the region around a pixel of interest. The difference between the mean brightness and the brightness of the pixel of interest, as outputted by the second high-resolution image sensor, is then derived to produce an output signal in which points to where the brightness changes in the image are emphasized. Subsequent processing enables textual and other information of interest in the document to be extracted from background information.

REFERENCES:
patent: 3538445 (1970-11-01), Brennen
patent: 3660774 (1972-05-01), Eachus
patent: 4750209 (1988-06-01), Shimura et al.
patent: 5020118 (1991-05-01), Sugiura
patent: 5047667 (1991-09-01), Howie
patent: 5151588 (1992-09-01), Kiri et al.

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