JPH02268076A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To attain intermediate tone recording of an original and transmission of an intermediate tone signal by varying the gradation of the density of a picture of a read original. CONSTITUTION:An original data read by a read section 3 is inputted to ROMs 5-9 with a relevant address via an address line 12 via an A/D converter section 4 and the density gradation is changed to a data whose density is higher as the address of the ROM is higher and number of output data is larger and the result is outputted to a data selector 10. The output data of the ROMs 5-9 is selected in response to the gradation designation by a switch 2 of an operation section 1 and recorded in a recording section 11 and sent via a coding section 15 and a communication control section 16 or the like and the intermediate tone recording and the transmission of intermediate tone are implemented by ease of operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a facsimile device capable of transmitting or recording halftones of a document, and particularly relates to gradation correction of halftones.

(Prior Art) Conventionally, when this type of facsimile machine performs halftone recording, for example, even if it is possible to switch the recording density, the gradation of the recording density is fixed, and it is not possible to change this gradation. I couldn't. In other words, the conventional recording density switching function has several reading slice levels for the original reading density, thereby uniformly shifting the density for all gradations that resolve the original reading density. This is a function that reduces or increases the density of the recording surface.

Incidentally, since halftone originals have various densities, depending on the original, it may be necessary to emphasize highlight parts or shadow parts. However, in the conventional facsimile machine described above, the gradation that resolves the reading density of the original is fixed, and this gradation has equal resolution characteristics in the highlight and shadow parts of the original, so the above processing is performed. The drawback was that it could not be done.

(Problems to be Solved by the Invention) As mentioned above, in conventional facsimile machines, the gradation that resolves the reading density of the original is fixed and cannot be changed, so the resolution of a specific density part of the original can be changed. Therefore, it was not possible to perform shadow enhancement or highlight enhancement.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and is a facsimile device that can perform halftone recording or halftone transmission by changing the gradation of the density that can be read on a document and changing the resolution of a specific density part. It is intended to provide.

[Structure of the Invention (Means for Solving the Problems) The present invention provides a facsimile machine having a halftone recording or halftone transmission function of an original, a reading means for reading the contents of the original into image data, and a reading means for reading the contents of the original into image data. gradation changing means for changing the density gradation of the image data read by the reading means; a plurality of gradation conversion means for converting the image data quantized by the analog-to-digital conversion means into quantized image data having density gradations corresponding to the unique pattern; and the plurality of gradation conversion means The image forming apparatus has a configuration including a selection means for selecting and outputting any one of the quantized image data outputted from the means.

(Function) In the facsimile apparatus of the present invention, the reading means reads the contents of the document and converts it into image data. The gradation changing means changes the gradation of the density of the image data read by the reading means. Further, in the gradation changing means, the analog-to-digital converting means quantizes the image data obtained from the reading means.

A plurality of gradation conversion means converts the image data quantized by the analog-to-digital conversion means into quantized image data having density gradation corresponding to each unique pattern. The selection means selects and outputs any one of the quantized image data output from the plurality of tone conversion means.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a facsimile apparatus of the present invention. 1 has a switch 2 for selecting a desired gradation using an operating section.

3 is a reading unit that reads the contents of the manuscript and converts it into image data; 4
converts analog data to digital data (data quantization)
5.6.7゜8.9 is an A/D converter that converts the image data read by the reading unit 3 into a gradation pattern that decomposes the density of the image data (RO) I, 10 is an RO
) A data selector that selects any one of the data output from 15 to 9, 11 a recording unit that prints the data on recording paper and outputs it, and 12 a digital output from the A/D converter 4. Digital signal line for transmitting data, 13-
5.13-6.13-7.13-8.13-9 is ROM
5.6.7.8.9, a data line that outputs the image data, 14 a digital signal that transmits the image data output from the data selector 10, 15 an encoding unit that encodes the image data, 16 an image This is a communication control unit that sends and receives data, and includes a modem 161 and an NCU 162. Second
The figure shows an example of the 'PJUN pattern stored in the ROM shown in FIG. 1, and the patterns shown in <A) to (E) are stored in ROM 5 to ROH9, respectively.

Each pattern is plotted with the ROM input address as the horizontal axis.
The output data from is shown on the vertical axis. However, the larger the input address, the higher the density, and the larger the number of output data, the higher the density.

Next, the operation of this embodiment will be explained. The image data (analog data) of the original read by the reading unit 3 is A.
The data is converted into digital image data by the /D converter 4, and inputted to the address lines of the ROMs 5 to 9 via the digital signal line 12. For example, the ROM 5 decomposes the density of the image data input to the address line into the gradation pattern shown in FIG. 2(A), and outputs this as output image data. This output image data is input to the data selector 1o via the data line 13-5. Other Rot(6
The same goes for 9 to 9, and image data corresponding to each gradation pattern is output, and these image data are input to the data selector 10 via data lines 13-6 to 13-9. On the other hand, the data selector 10 operates according to the gradation selection information input from the switch 2 of the operation unit 1 (RO).
One of the output image data of l5 to ROH9 is selected and outputted to the digital signal line 14. At this time, if the apparatus is in the copy mode, the image data output from the data selector 10 is sent to the recording section 11 via the digital signal line 14, and is recorded in halftone by this recording section 11. At this time, if the device is in the transmission mode, the image data output from the data selector 10 is encoded by the encoding section 15, modulated by the modem 161 of the communication control section 16, and then sent to the NCU 162. Sent via Here, the above RO)l 5 to ROH9
The gradation conversion operation will be explained. As mentioned above (ROM
5-RO) 9 contains the gradation correction patterns shown in FIGS. 2(A)-(E). Therefore, in the ROM 5 containing pattern 1 shown in FIG. 2 (A>), the gradation is not corrected and the gradation of the output image data remains the same as the gradation of the output image data. It becomes the key.

Therefore, when the data selector 10 selects Rot(5), the recording density by the recording unit 11 is the same as the original density as shown in FIG. 3 (A). f?OH6 has a characteristic that the gradation of the output image data becomes rich in the dark part, so the output image data has shadows emphasized compared to the input image data.Therefore, the data selector 10 When ROM 6 is selected, the recording density by the recording unit 11 is such that the shadow is emphasized compared to the original density as shown in FIG. 3(B).Pattern 3 in FIG. 2(C) The ROM 7 containing the image data has a characteristic that the gradations of the output image data are rich in areas with high density, so that the highlights of the output image data are emphasized compared to the input image data.

Therefore, when the data selector 10 selects the ROM 7, the recording density by the recording unit 11 is such that the highlights are emphasized compared to the original density, as shown in FIG. 3(C). In ROM 8 containing pattern 4 in Figure 2 (D>), the output image data has a characteristic that the gradations are rich in the halftone part of the density, so the output image data is halftone compared to the input image data. Therefore, when the data selector 10 selects RO)l8, the recording density by the recording unit 11 is a halftone with respect to the original density, as shown in FIG. 3 (D>). will be emphasized.The RO containing pattern 5 in Figure 2 (E)
M9 has a characteristic that the output image data has rich gradations in high-density areas and low-density areas, so the output image data has highlights and shadows emphasized compared to the input image data. Therefore, the data selector 10 is
When selecting , the recording density by the recording section 11 is as shown in Fig. 3 (
As shown in E), the recording density is such that highlights and shadows are emphasized compared to the original density.

According to this embodiment, before copying or transmitting a document,
If the operator selects a desired gradation pattern by operating the switch 2, the gradation of the image data read by the reading section 3 can be corrected to the desired gradation and then copied or transmitted. Therefore, the degree of freedom of halftone recording or halftone transmission of the facsimile device is expanded, and the operability of the device can be improved.

[Effects of the Invention] As described above, according to the facsimile apparatus of the present invention, halftone recording or halftone transmission of a document is performed by changing the resolution of a specific density portion by changing the density gradation of the document. be able to.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the facsimile apparatus of the present invention, FIG. 2 is a diagram showing an example of a gradation pattern included in RO)l shown in FIG. FIG. 2 is a diagram showing the relationship between document density and recording density corresponding to the gradation pattern example shown in FIG. 2; 2...Switch 3...Reading part 4...
A/D conversion units 5 to 9...ROM 10...Data selector 11...Recording unit 16...Communication control unit

Claims (2)

[Claims] (1) In a facsimile machine that has a halftone recording or halftone transmission function of a document, there is a reading means that reads the contents of the document and converts it into image data, and a gradation of the density of the image data read by the reading means. 1. A facsimile device comprising a tone changing means for changing the tone. (2) The gradation changing means includes an analog-to-digital converting means for quantizing the image data obtained from the reading means, and converting the image data quantized by the analog-to-digital converting means into a density gradation corresponding to a unique pattern. comprising a plurality of tone conversion means for converting into quantized image data; and a selection means for selecting and outputting any one of the quantized image data output from the plurality of tone conversion means. The facsimile machine according to claim 1, characterized in that: