JPH04271572A - Facsimile code converter - Google Patents

Abstract

PURPOSE:To reduce the cost of the converter by using hardware processing to convert a picture data into an intermediate language and using software processing to generate a coding data from the intermediate language. CONSTITUTION:An encoding arithmetic section 5 uses an address controller 4 so as to control a line memory 1 thereby checking the state of picture elements sequentially and when a change point is detected, an intermediate language is generated from the information. Upon the receipt of this informaition, register group 6 informs the detection of the change point to a microcomputer processing circuit 9. The circuit 9 references a coding table corresponding to the mode to generate a coding data from the intermediate language. Thus, the cost of the converter is reduced without need of a high speed microcomputer and a memory of large capacity.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a facsimile code conversion device for converting image data into coded data such as one-dimensional MH code, two-dimensional MR code, MMR code, etc. It is related to.

0002

2. Description of the Related Art FIG. 6 is a block diagram of a conventional facsimile code conversion device realized by software processing. In the figure, 11 is a microcomputer;
2 is a system bus for the address, data, etc. of this microcomputer 11; 13 is a system bus for the microcomputer 1;
1 is a ROM that stores execution instructions, 14 is a RAM that stores data, etc., 15 is a DMA controller, 16 is a serial bus to which image data from the line sensor is sent, and 17 is a serial bus.・It is a parallel converter.

FIG. 7 is a block diagram of a conventional facsimile code conversion device realized by hardware processing.
22 is an image data bus for transferring this image data 21, 23 is an arithmetic unit for encoding, 24 is a register group for storing the operation results, and 25 is an image data bus for transferring encoded data. A code bus 26 is encoded data.

Next, the operation will be explained. In the configuration shown in FIG. 6, image data read from the line sensor is sent to the serial/parallel converter 1 via the serial bus 16.
7, where the serial data is converted into parallel data in units of 8 bits. Next, the DMA controller 15 controls the system bus 12, and this parallel data is transferred to the RAM 14. When one line of image data is stored in the RAM 14, control of the system bus 12 is transferred to the microcomputer 11. The microcomputer 11 sequentially reads the image data stored in the RAM 14 according to the flow of the program stored in the ROM 13, checks the change points, and converts the encoded data corresponding to the image data. will be created. Furthermore, in the configuration shown in FIG. 7 which is realized by hardware processing, image data 21 read from a line sensor is transferred to an arithmetic unit 23 via an image data bus 22. Arithmetic unit 23
checks the change points of the input image data 21, transfers the corresponding encoded data 26 to the register group 24, and outputs it through the code bus 25.

[0005]

[Problems to be Solved by the Invention] Since the conventional facsimile code conversion device is configured as described above, (1
) In a case like the one shown in FIG. 6 where processing is performed only by software, many parts depend on the processing capacity of the microcomputer 11, making high-speed processing difficult or requiring an expensive high-speed microcomputer. There were problems such as: (2) In the case shown in Fig. 7 where processing is performed only by hardware, the encoded data 26 is created by hardware, so the processing results are output at high speed, and the memory for storing the data is This method requires a large number of steps, it is difficult to stop the process midway, and it requires expensive hardware. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to construct a facsimile code conversion device that can be realized at low cost and with a smaller circuit scale.

[0006]

[Means for Solving the Problems] A facsimile code conversion device according to the present invention includes an intermediate language creation circuit that creates an intermediate language from image data through hardware processing, and an intermediate language creation circuit that creates an intermediate language from image data through software processing. - A microcomputer processing circuit that converts the data into a computer.

[0007]

[Operation] In the present invention, among the encoding processing, detection of run length information and MR mode information and conversion to an intermediate language are performed by hardware processing by an intermediate language creation circuit, and from this intermediate language The process up to the creation of encoded data is performed by software processing by a microcomputer processing circuit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a line memory for three lines. 2 is a serial bus into which image data from a line sensor is input; 3 is a line selector which selects one of the line memories 1 and transfers the image data thereto. 4
is an address controller which controls the address of the line memory 1. 5 is an encoding operation unit, 6 is a group of registers for storing the intermediate language of the operation result, 7 is a system bus for connection with the microcomputer, 8 is an interrupt signal to the microcomputer, and 9 is the microcomputer. The data processing circuit is equipped with a ROM that stores an encoding table for converting an intermediate language into MH code and MR code. 10 is an intermediate language creation circuit.

Next, the operation will be explained. Image data read by an image sensor (not shown) is sent to an intermediate language creation circuit 10 via a serial bus 2, and is stored in a line memory 1 selected by a line selector 3.
is stored in In the case of MR encoding, one line of this line memory 1 is used as a reference line, and one line is used as an encoding line. Furthermore, in the case of MH encoding, one line is simply used as an encoding line. In addition,
As the reference line used in MR encoding, it is necessary to select the line memory 1 that was used as the encoding line in the encoding immediately before the encoding line.

First, MH mode encoding will be explained. The encoding operation unit 5 controls the line memory 1 by the address controller 4, checks the state of the pixels in order, and when a change point (the point where the pixel changes from white to black or from black to white) is detected, From this information, for example, an intermediate language representing black 2 white 4 black 4 as shown in FIG. 2 is created. Specifically, as shown in FIG. 3, information indicating the presence or absence of a makeup code, color designation, and termination run length (or makeup run length) is created and transferred to the register group 6. When the register group 6 obtains this information, it notifies the microcomputer processing circuit 9 that a change point has been detected by setting a specific flag or using an interrupt signal 8 or the like. The microcomputer processing circuit 9 detects the mode and loads the mode information according to the flowchart shown in FIG. 4, and refers to the encoding table corresponding to the mode. Then, encoded data is created from a 2-byte intermediate language as shown in FIG. Note that the MR horizontal mode is also similar to the MH mode encoding, and the intermediate language creation circuit 10 generates the mode determination result and VR as shown in FIG.
, VL mode, and then the microcomputer processing circuit 9 creates encoded data. Note that the above embodiment shows only an example of the intermediate language, and the same effect can be achieved with other formats.

[0011]

As explained above, the present invention provides an intermediate language creation circuit that creates an intermediate language from image data through hardware processing, and a circuit that converts this intermediate language into image data through software processing. Since the device is constructed with a microcomputer processing circuit, there is no need to use a high-speed microcomputer or a large-capacity memory, and the device can be made inexpensive and can perform high-speed processing.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a facsimile code conversion apparatus of the present invention.

FIG. 2 is a conceptual diagram showing the process of converting image data to encoded data.

FIG. 3 is a diagram showing an example of an intermediate language used in the present invention.

[Figure 4] Flowchart of software that implements the present invention
FIG.

FIG. 5 is a diagram showing an example of an intermediate language used in the present invention.

FIG. 6 shows a conventional facsimile code conversion device.

FIG. 7 shows a conventional facsimile code conversion device.

[Explanation of symbols]

1 Line memory 2 Serial bus 3 Line selector 4 Address controller 5 Encoding operation unit 6 Register group 7 System bus 8 Interrupt signal 9 Microcomputer processing circuit 10 Intermediate language creation circuit

Claims (1)

[Claims] Claim 1: Consisting of an intermediate language creation circuit that creates an intermediate language from image data through hardware processing, and a microcomputer processing circuit that converts this intermediate language into image data through software processing. A facsimile code conversion device characterized by: