JPH0233224B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a facsimile transmission system that detects two colors, black and red, and transmits image signals in accordance with the detection. [Prior Art] Conventionally, when displaying important parts of a document, the important parts were underlined in red or a red frame was drawn around the important parts, and the document was inserted into a facsimile machine and sent. However, depending on the reception conditions, the underline or red frame may become unclear, resulting in the disadvantage that the display of important parts may become unclear. [Summary of the Invention] The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional technology, and first detects a predetermined plurality of bits of a red image signal, and then detects a predetermined plurality of bits of a white image signal. Until then, the red image signal will be converted to a white image signal, and the black image signal will be converted to a red image signal and transmitted. The present invention provides an extremely effective facsimile transmission system which is recorded in red at the receiving end. [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 is switched from green light GL to red light RL during one period of the main scanning period indicated by the interval of the main scanning period pulse a, and the image Scanning against the sensor corresponds to green light GL once, red light GL
The scanning is performed twice in correspondence with RL, and the image signal c is generated three times in response to this. As shown in the memory access status d, composite image signal e, and transmission f, the first scanning Image signal c from the image sensor based on green light GL is written
It is stored in memory by WT and retrieved by read RD during the second scan, and this and 2
By combining the red light RL from the second scan with the image signal c from the image sensor, black, red, and white image signals B, R, and W are obtained as a composite image signal e, and then the black Only the image signal B is transmitted, and then, by combining the contents of the memory and the image signal c from the image sensor based on the red light RL from the third scan, black, red, and white image signals are generated as in the previous time. B, R, and W are obtained, and only the red image signal R is transmitted by the transmission f, and this is repeated in response to the generation of the main scanning period pulse a. The reflectance of white, black, and red on the scanning surface in response to irradiation with green light GL and red light RL is as shown in the table below, and based on 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, important parts of a document are transmitted as a red image signal,
Since important parts can be confirmed reliably and easily on the receiving side, a remarkable effect can be obtained in terms of operation of the facsimile device.

[Brief explanation of drawings]

The figures show an embodiment of the present invention; FIG. 1 is a timing chart of a transmission operation, FIG. 2 is a block diagram of an image signal processing circuit, FIG. 3 is a timing chart showing waveforms of each part in FIG. 2, and FIG. The figure is a block diagram similar to FIG. 2 showing another embodiment. IS...Image sensor, MM...Memory,
SNS...Synthesis circuit, RCD...Red continuous detection circuit,
WCD...White continuous detection circuit, FF...FFC (flip-flop circuit), _G1 , _G2 , _G11 , _G13 to _G15 ...
AND gate, G ₃ , G ₁₂ ...OR gate.

Claims (1)

[Claims] 1 During one period of the main scanning period, scanning is performed using light with a wavelength that has a low reflectance for black and red, and scanning is performed using light that has a wavelength that has a low reflectance for black and a high reflectance for red. In a facsimile transmission method that detects an image signal, a red image signal, and a white image signal, when a predetermined plurality of consecutive bits of the red image signal are detected and a predetermined plurality of consecutive bits of the white image signal are detected. The storage means for producing a memory output between when the memory output is detected converts the red image signal detected while producing the memory output into a white image signal, and converts the black image signal into a red image signal. A facsimile transmission method that is characterized by converting to .