Browse Prior Art Database

Simplified Facsimile Terminal for Image Processing

IP.com Disclosure Number: IPCOM000053116D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 4 page(s) / 90K

Publishing Venue

IBM

Related People

Ehara, K: AUTHOR [+2]

Abstract

This article describes a simplified configuration using AND gate, Exclusive OR gate and OR gate in a control unit of a facsimile terminal for performing the trimming of an image of an original document, the production of a reversed image of the original document, and the reproduction of a combined or superimposed image of a variable image and a fixed image.

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Simplified Facsimile Terminal for Image Processing

This article describes a simplified configuration using AND gate, Exclusive OR gate and OR gate in a control unit of a facsimile terminal for performing the trimming of an image of an original document, the production of a reversed image of the original document, and the reproduction of a combined or superimposed image of a variable image and a fixed image.

The facsimile terminal basically includes a scanner unit 1, a control unit 2 and a printer unit 3, as shown in Fig. 1. The detail of the control unit 2 is described hereinbelow. A data compression scheme can be incorporated into the facsimile terminal to reduce an amount of data which is processed in or transmitted through the facsimile terminal. Marked indicia with a black level on the original document are processed as binary 1 data, while a background area with a white level is processed as binary 0 data.

Trimming:

Fig. 2 shows the trimming of the scanned original image A. The original image A is stored in a first memory location of a random-access memory 4 under the control of an address register 5. A mask image B, having black areas B1 and B2 marked, is stored in a second memory location in the random-access memory
4. The black areas B1 and B2 are processed as binary 1 data. Both the original image A and the mask image B are supplied to an AND circuit 16 through a gate 6, a register 7 and a gate 10 and a gate 8, a register 9 and a gate 11, respectively, under control of microinstructions fetched from a read-only memory 28, so that the portions of the original image A corresponding to the black areas B1 and B2 are extracted as a trimmed image C.

The trimmed image C is sent from the sender facsimile terminal to the receiver facsimile terminal through a transmission line 27 under the control of a transmission block 26.

Reversed Image:

Figs. 3(a) and (b) show the production of the reversed image F1 and F2 of an original image D. The original image D is exclusively ORed with mask image E1 or E2 in the Exclusive OR circuit 18. The mask image E1 has the black, i.e., binary 1 data, marked over the whole area thereof to produce the entirely reversed image F1, while the mask image E2 has the black marked in its central area to produce the partially reversed image F2. The mask images E1 and E2 are also stored in the random-access memory 4 as in the case of the trimming operation. The reverse image production is made at either the sender facsimile terminal or the receiver facsimile terminal. To generate the mask images B, E1 and E2, a mask sheet having such black area, as the partial black area in the Figs. 2 and 3(b) and the whole black area in Fig. 3(a), marked thereon is scanned by the scanner unit, and the scanned data, i.e., the mask image, is stored i...