Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-07-14
1984-11-13
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358280, 358288, 382 51, H04N 140, H04N 112, H04N 117, H04N 14
Patent
active
044829221
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a picture signal readout system in the facsimile equipment and so on
Furthermore, it relates to a readout system which can read picture data while a manuscript is being shifted.
FIG. 1 outlines an example of an existing facsimile transmitter. In FIG. 1, picture data of a manuscript 1 which is irradiated by the lighting source 4 having the power supply 3 and fed by the roller 2 is read for a line by the CCD (Charge Coupled Device) image sensor (photo-electric conversion element) 6 via the lens 5, amplified by the amplifier 7 after photo-electric conversion and then input to the discriminator 8 as the analog picture signal AP. The discriminator circuit 8 compares the received analog picture signal AP with the discrimination level signal TH which discriminates black and white level, and outputs the digital picture signal DP of logic "1" considering the analog picture signal AP higher than said discrimination level signal TH as the white signal W and the digital picture signal DP of logic "0" considering the analog picture signal AP lower than the discrimination level signal TH as the black signal B. The digital picture signal DP output from the discrimination circuit 8 is input to the picture signal processor 9 and then transmitted to the transmission path via the modulator.
Such facsimile equipment is provided with following means in order to omit transmission of the picture data of the blank portion in view of improving the transmission rate of manuscripts.
Namely, the picture data as many as one line is read by the image sensor 6 indicated in FIG. 1, and this one line length is divided into predetermined number of blocks and it is discriminated whether the black signal B exists or not in each block divided. The block not including the black signal B is not transmitted as the picture signal and only the block including the black signal B is transmitted as the picture signal.
Such existing facsimile equipment has an advantage that the picture signal of the blank portion is not transmitted and the transmission time can be curtailed as much and thereby the send time can also be shortened.
However, above means brings about following disadvantages.
Namely, the image sensor 6 indicated in FIG. 1 cannot read picture data momentarily but, reads within a predetermined period, and the time for starting read of picture data is specified by the time for sending the preceding line data to the transmission path. When the preceding line data is transmitted, it is immediately required to transfer the data read by the image sensor 6 but, the read time of the image sensor 6 is constant and may be longer than the transmission time of the preceeding line.
On the occasion of reading picture data by the image sensor 6, the paper is fed as much as the width of one scanning line from the preceding line by the roller 2 and when the manuscript stops, data is read. However, if the time for sending data of preceding line is short as explained above, this situation may sometimes require extra time for the image sensor 6 to start read of picture data from the interim time during paper feed. Particularly, when the preceding line is all white, the time required for sending the data of preceding line to the transmission path becomes the shortest and situation may some time make it impossible for the image sensor 6 to read accurately the picture data of the next line of the manuscript having been fed.
Such process is explained using FIG. 2. FIG. 2 shows the conditions of main scanning and sub-scanning of the manuscript 1 indicated in FIG. 1. In this figure, the main scanning is carried out in the direction indicated by the arrow A and the image sensor reads picture data of the lines in this direction. The lines L.sub.1, L.sub.2, L.sub.3, . . . are read in this sequence. The arrow B indicates the sub-scanning direction and each paper feed moves the paper in the length indicated by b. Therefore, the image sensor reads picture data in the area ab formed by the length a of main scann
REFERENCES:
patent: 4247873 (1981-01-01), Decuyper
patent: 4272789 (1981-06-01), Biron
Britton Howard W.
Fujitsu Limited
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