JPH02260972A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To realize half tone communication at high quality by providing a picture signal processing part, which selects and uses one of plural dither matrixes constituted of different threshold levels according to signals inputted from a facsimile control part. CONSTITUTION:When a communication control part 12 discovers a code indicating the classification of the printer part of the opposite communication equipment in a preprocedure after line connection, the part 12 notifies the code to a facsimile control part 13. When the picture quality mode designated by an operating part, which is not shown in a figure, is at a half tone, the facsimile control part 13 decodes the code, and instructs a picture signal processing part 11 to respectively select a dither matrix 15 when the opposite communication equipment has a PPC printer, a dither matrix 16 when the equipment has a thermal transfer printer, a dither matrix 17 when the equipment has a heat sensitizing printer, or the dither matrix determined beforehand so as to obtain the best result when the equipment has the printer in the method other than the above mentioned ones.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine that is capable of transmitting an optimal pseudo-halftone image signal that matches the density characteristics of a printer of a communicating party. Regarding.

2. Description of the Related Art Conventionally, as a means for expressing halftones in facsimiles, it is common to use a pseudo halftone image signal based on a dither matrix. The threshold level of this dither matrix is set so that the best halftone output can be obtained when printing with the printer section.

Problems to be Solved by the Invention However, the threshold level of the dither matrix of the above-mentioned conventional facsimile machine is often set so as to obtain the best result when outputting with the machine's own printer. Therefore.

When a halftone document is sent to a facsimile machine that has a printer with different density characteristics (relationship between number of dots and apparent density) than the facsimile machine's own printer, it has the disadvantage of causing problems in image quality.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a new facsimile apparatus which eliminates the above-mentioned drawbacks inherent in the conventional technology and makes it possible to realize high-quality halftone communication.

Means for Solving the Problems In order to achieve the above object, a facsimile apparatus according to the present invention includes a communication control unit that can identify the type of printer of a communicating party, and a printer output from the communication control unit. A control section of the facsimile that inputs and analyzes type information and outputs a dither matrix selection signal, and one of multiple dither matrices configured with different threshold levels depending on the signal input from this facsimile control section. and an image signal processing section that selects and uses one image signal processing section.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 1, reference numeral 11 is an image signal processing unit that performs various image signal processing including pseudo halftone processing on image signals input from a document scanning unit (not shown), and 12 is a G3
A communication control unit that controls transmission and reception of standards and in-house standards;
13 is a facsimile control unit that controls the entire facsimile machine; 14 is a dither matrix selection unit that selects a dither matrix designated by the facsimile control unit 13; and 15 is for obtaining an optimal pseudo-halftone output for the PPC printer. 16 is a dither matrix for obtaining an optimum pseudo-halftone output for a thermal transfer printer, and 17 is a dither matrix for obtaining an optimum pseudo-halftone output for a thermal printer.

In FIG. 1, the operating section, document scanning section, printer section, etc. that are naturally included in a facsimile machine are omitted.

The operation of the embodiment of the present invention will be explained below.

When a transmission operation is specified from an operation section (not shown), the facsimile control section 13 causes the communication control section 12 to start the transmission operation. When the communication control unit 12 finds a code indicating the type of printer unit of the communicating party during the pre-procedure after connecting the line, it notifies the facsimile control unit 13 of the code. is a halftone, the facsimile control unit 13 decodes this code, and if the communicating party has a PPC printer, the facsimile control unit 13 prints the dither matrix 1.
5, dither matrix 16 if you have a thermal transfer printer, dither matrix 7 if you have a thermal printer, and dither matrix 7 if you have a printer of a type other than the above.
In response to this, the image signal processing section 11 is instructed to select a dither matrix predetermined in order to obtain the best result.

The image signal processing unit 11 selects the dither matrix specified by this command using the dither matrix selection unit 14, converts the image signal input from the original scanning unit (not shown in Figure 1) into a pseudo halftone image signal, and communicates the signal. 0 input to the control unit 12
The communication control unit 12 sequentially transmits the image signals to the communication partner device according to the procedure.

Currently, the pre-procedure generally does not include a code that indicates the type of printer unit, but when communicating between in-house machines, by adding this code to the pre-procedure, they can recognize each other. It is.

As described above, at least when the communication partner is a printer of one's own company, pseudo halftone processing can be performed in accordance with the printer of the communication partner, thereby realizing high-quality halftone communication.

In addition, in the case of this embodiment, if the communication partner is another company's machine and there is no code indicating the printer type of the other party in the pre-communication procedure, processing is performed assuming a thermal printer, which is the most popular type at present. It is set as follows.

As described in detail, according to the present invention, by selecting an optimal dither matrix according to the type of printer of the communicating party, it is possible to achieve high-quality halftone communication.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 11... Image signal processing section, 12... Communication control section, 13
...Facsimile control section, 14...Dither matrix selection section, 15...Dither matrix for PPC printer, 16...Dither matrix for thermal transfer printer, 17...Dither matrix agent for thermal printer

Claims (1)

[Claims] A communication control unit that can identify the printer type of the communication partner, a facsimile control unit that inputs and analyzes printer type information output from the communication control unit, and outputs a dither matrix selection signal; A facsimile apparatus characterized by having an image signal processing section that selects and uses one of a plurality of dither matrices configured with different threshold levels according to a signal input from a control section of the facsimile. .