JPH0233225B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a facsimile transmission system that detects white, black, and red colors and transmits image signals in accordance with the detected colors. [Prior Art] Conventionally, when a part of a document is deleted and sent using a facsimile machine, the document is copied, the unnecessary portion is deleted, and the document is pasted on a backing paper to be used as the document to be sent.
Alternatively, a method is used in which unnecessary portions are masked as a transmitted document, which has the drawback of requiring a great deal of effort. [Summary of the Invention] The present invention has the purpose of fundamentally solving the above-mentioned drawbacks of the conventional technology. Until the bits are detected continuously, the detected black and red image signals are converted to white image signals and sent. If the unnecessary parts of the document are filled with red and inserted into the facsimile machine, the red image signals will be transmitted. To provide an extremely effective facsimile transmission system in which the filled-in range is transmitted as white. [Example] Hereinafter, the present invention will be explained in detail with reference to figures showing examples. FIG. 1 is a timing chart of the transmission operation, in which the scanning light b emits green light during one cycle of the main scanning cycle indicated by the interval of the main scanning cycle pulse a.
As the GL switches to the red light RL, the image sensor is scanned twice, and the image signal c is generated twice, and the memory access status d and the composition are changed. As shown in the image signal e and transmission f, the image signal c from the image sensor based on the green light GL from the first scan is temporarily stored in the memory by writing WT, and then retrieved by reading RD during the second scan. By combining this with the image signal c from the image sensor based on the red light RL from the second scan, black, red, and white image signals B, R, and W are obtained as a composite image signal e. , only the black image signal B is transmitted by transmission f, and the main scanning period pulse a
This process is repeated as the situation arises. The reflectance of white, black, and red on the scanning surface in response to irradiation with green light L and red light RL is as shown in the table below, and according to the logical conditions according to these reflectances,
Each image signal based on the green light GL and the red light RL is combined, and white, black, and red are determined.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when unnecessary portions of a document are deleted and transmitted, the effort is greatly simplified, and a remarkable effect can be obtained in terms of operation of a facsimile machine.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, with FIG. 1 being a timing chart of a transmission operation, and FIG. 2 being a block diagram of an image signal processing circuit. IS...Image sensor, MM...Memory,
SNS...Synthesis circuit, RCD...Red continuous detection circuit,
WCD...White continuous detection circuit, FF...FFC (flip-flop circuit), G...AND gate.

Claims (1)

[Claims] 1 During one period of the main scanning period, scanning is performed using light with a wavelength that has a small reflectance for black and red, and scanning using light that has a wavelength that has a small reflectance for black and a large reflectance for red. In a facsimile transmission method that detects each image signal, the memory output is performed between when a predetermined plurality of bits of the red image signal are continuously detected and when a predetermined plurality of bits of the white image signal are continuously detected. A facsimile transmission system characterized in that the detected black image signal and red image signal are converted into white image signals and transmitted while the generating storage means is generating a storage output.