JP2920997B2 - Graphic input device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic input device, and more particularly to a CCD (Charge) for describing lines (graphics) of a drawing drawn as a map, a logic circuit diagram or the like.
The present invention relates to a graphic input device that performs photoelectric conversion for each scanning line by a sensor such as a coupled device sensor, reads one pixel in multi-valued form, binarizes it, compresses it, and transfers it to a host device.

[Conventional technology]

Conventionally, in order to confirm the normality of this type of graphic input device by performing a reading accuracy test on this type of graphic input device, an output device such as a printer is connected, and a test chart is attached to a drawing reading plate and read. The reading accuracy has been determined by a desk calculation based on the output (reading) result. Further, if the result of the reading accuracy test is abnormal, a maintenance person is called out to replace the sensor or the like, and the graphic input device is repaired.

[Problems to be solved by the invention]

In the conventional graphic input device described above, in order to perform a reading accuracy test, the reading accuracy must be determined by connecting an output device such as a printer or performing a desk calculation based on the output result of the test chart attached to the drawing reading board. Therefore, the reading accuracy test cannot be easily performed, and there is a disadvantage that it is difficult to perform an accurate reading accuracy test due to an error in attaching a test chart or the like.

Furthermore, even if the reading accuracy test reveals abnormalities,
Since the maintenance staff must be called out to replace the sensors, etc. Replacement of the sensor or the like requires fine adjustment, so the time until restoration (time during which the graphic input device cannot be used) becomes longer, and there is a disadvantage that inconvenience occurs when there is a task that needs to be processed quickly by the graphic input device. .

In view of the above, it is an object of the present invention to be able to easily and accurately perform a reading accuracy test relating to density, and to use a sensor for replacement of a sensor or the like by a maintenance person even if a result of the reading accuracy test is abnormal. It is an object of the present invention to provide a graphic input device in which ineffective time is almost eliminated.

[Means for solving the problem]

The graphic input device according to the present invention includes a test chart incorporated in a drawing reading plate and having a constant density standard value, a sensor being operated, and operating when a reading accuracy of the sensor is out of standard. A sensor unit having a backup sensor that substitutes for, a graphic input circuit that reads only the drawing using the sensor unit in the normal mode, and reads the drawing and the test chart using the sensor unit in the test addition mode, A mode switching circuit for controlling switching between the normal mode and the test addition mode in the graphic input circuit; and density data of the test chart read by the graphic input circuit when the mode switching circuit switches to the test addition mode. And the density standard value of the test chart stored in advance An accuracy check circuit that calculates the read accuracy of the operating sensor and checks whether the read accuracy is out of standard; and that the read accuracy of the operating sensor is out of standard by the accuracy check circuit. A selector circuit for switching the sensor unit to operate with the backup sensor when determined, and the sensor when the read accuracy of the operating sensor is determined to be out of specification by the accuracy check circuit; A display circuit for displaying that the unit is operated by the backup sensor.

[Action]

In the graphic input device of the present invention, a test chart having a constant density standard value is incorporated in the drawing reading plate, and the sensor operated by the sensor unit and the reading accuracy of the sensor are out of the standard. A backup sensor that replaces the operation at times, the graphic input circuit uses the sensor unit to read only the drawing when in the normal mode, and reads the drawing and test chart using the sensor unit when the test addition mode is used, and a mode switching circuit. Controls switching between the normal mode and the test addition mode in the graphic input circuit, and stores in advance the density data of the test chart read by the graphic input circuit when the accuracy check circuit is switched to the test addition mode by the mode switching circuit. From the density standard value of the test chart Calculates the reading accuracy of the sensor and checks whether or not the reading accuracy is out of specification. When the reading accuracy of the sensor operated by the selector circuit is determined to be out of specification, the sensor unit is backed up. When the display circuit determines that the reading accuracy of the sensor operated by the accuracy check circuit is out of the standard, the display circuit indicates that the sensor unit is operated by the backup sensor. .

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the graphic input device (graphic input device 1) of the present invention. The figure input device 1 includes a drawing 2, a test chart 3, a sensor unit 4 including a sensor A5 (operating sensor), a sensor B6 (backup sensor) and a selector circuit (1) 7, a drawing reading board 21. (See FIG. 2) and a graphic input circuit 8 including a sensor unit control unit (not shown), a mode switching circuit 9, an address detection circuit 10, a selector circuit (2) 11, an accuracy check circuit 12, A display circuit 13;
Binarization circuit 14, compression circuit 15, input / output interface
16 and is configured. The graphic input device 1 configured as described above reads the set drawing 2 by moving the sensor unit 4, performs binarization processing and compression processing, and sends the compressed data (2) to a host device (not shown). (Data generated by the value processing and the compression processing).

FIG. 2 is a diagram showing the positions of the drawing 2 and the test chart 3 on the drawing reading plate 21 and the reading range of the sensor unit 4. The drawing 2 is set in accordance with the starting point 101 of the drawing on the drawing reading plate 21. On the other hand, the test chart 3 is incorporated on the drawing reading plate 21 (the test chart 3 is made of a film having a constant density standard value). The sensor unit 4 reads only the drawing 2 in the normal mode and reads both the drawing 2 and the test chart 3 in the test addition mode while moving on the drawing reading plate 21 from left to right.

Next, the operation of the graphic input device 1 configured as described above (operation at the time of a reading accuracy test, etc.) will be described.

At the time of reading accuracy test, the operator sets the drawing 2 drawn as a map, a logic circuit diagram, or the like on the drawing reading board 21 and presses a test addition mode button of the mode switching circuit 9.

When the test addition mode button is pressed, the mode switching circuit 9 outputs a test addition mode signal to the graphic input circuit 8 (when the normal mode button is pressed, the mode switching circuit 9 inputs the normal mode signal to the graphic input circuit 8). Output to the circuit 8).

When the test addition mode signal is sent, the graphic input circuit 8 enters the test addition mode while notifying the address detection circuit 10 of address information indicating the position of the sensor A5 of the sensor unit 4. The test addition mode refers to a mode in which the drawing 2 is read (the description line of the drawing 2 is photoelectrically converted for each scanning line using the sensor unit 4 and one pixel is read in multi-value), and the test chart 3 is read. (Note that
When the normal mode signal is sent, the figure input circuit 8
This is a normal mode in which only the drawing 2 is read).

Here, when a drawing reading instruction is sent from the host device to the graphic input device 1, the graphic input device 1 performs the following reading operation.

When a drawing reading instruction is sent (this transmission mode is not shown), the graphic input circuit 8 notifies the address detection circuit 10 of address information indicating the position of the sensor A5 of the sensor unit 4, Start reading 2.

When the address detection circuit 10 detects that the sensor A5 has moved to the start point 102 (see FIG. 2) of the test chart based on the address information indicating the position of the sensor A5 sent from the graphic input circuit 8, the test chart The input signal is output to the selector circuit (2) 11.

When the test chart input signal is sent, the selector circuit (2) 11 switches to a mode for performing a reading accuracy test. That is, the multi-valued data (1 pixel = 8 bits) in FIG. 2 is transferred from the graphic input circuit 8 to the binarization circuit 14, and the multi-valued data of the test chart 3 is transmitted from the graphic input circuit 8 to the accuracy check circuit 12. Switch to the transfer path.

Data read before the path switching shown above (Fig. 2
Multi-valued data) is sent to a binarization circuit 14 where it is quantized to binary, and then sent to a compression circuit 15 where it is compressed by a one-dimensional encoding run-length-vector conversion or the like, and further input. The data is transferred to the host device via the output interface 16.

On the other hand, the data read after the above-described path switching (multi-value data of the test chart 3) is sent to the accuracy check circuit 12.

When the multi-value data of the test chart 3 is sent, the accuracy check circuit 12 calculates the reading accuracy using the density data indicated by the multi-value data and the density standard value of the test chart 3 stored in advance. If all the values (values indicating the reading accuracy) are within the standard of the graphic input device 1, a normal signal is sent to the display circuit 13, and if any of the values is out of the standard, the sensor switching signal is sent. To the selector circuit (1) 7, the graphic input circuit 8, and the display circuit 13.

When the sensor switching signal is sent, the selector circuit (1) 7 converts the multi-value data of the drawing 2 or the test chart 3 into a backup sensor (sensor B6) instead of the sensor A5.
Is switched to the mode for sending to the graphic input circuit 8 via the.

When the sensor switching signal is sent, the graphic input circuit 8 switches to use the sensor B6 instead of the sensor A5, and notifies the address detection circuit 10 that the sensor B6 is being used. Accordingly, the address information notified from the graphic input circuit 8 to the address detection circuit 10 is the sensor B6.
Address information indicating the position of

At this point, the sensor backup (switching to the backup sensor) is completed, and the drawing 2 can be read.

On the other hand, the display circuit 13 lights the normal lamp when the normal signal is sent, and the lamp indicating that the sensor is backing up when the sensor switching signal is sent (the sensor unit 4 is operated by the backup sensor. Lamp that displays is turned on.

In this way, even if the result of the reading accuracy test is abnormal, it can be automatically switched to the backup sensor immediately, and the drawing 2 can be read, so that extra time is required for repairing the graphic input device 1. There is almost no loss, and the operator can perform the task without any trouble even when the task to be processed by the graphic input device 1 has been set up. Then, at the time of scheduled stoppage of work, maintenance personnel can have the sensor unit 4 replaced.

〔The invention's effect〕

As described above, the present invention performs a reading accuracy test on the density of a graphic input device using a test chart incorporated in a drawing reading board and an accuracy check circuit or the like in which standard values of the test chart are stored in advance. This makes it possible to easily perform a reading accuracy test without connecting an output device such as a printer or performing desk calculations, thereby preventing an error in the reading accuracy test due to manual operation (such as attaching a test chart). There is an effect that can be.

Further, even if the result of the reading accuracy test is abnormal, it is possible to immediately switch to the backup sensor. Thus, the task to be processed by the graphic input device can be continued without taking much.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 shows the positions of the drawing and test chart in FIG. 1 on the drawing reading plate and the reading range of the sensor unit in FIG. FIG. In the figures, 1 ... a graphic input device, 2 ... a drawing, 3 ... a test chart, 4 ... a sensor unit, 5 ... a sensor A, 6 ... a sensor B (backup sensor), 7 ... a selector circuit ( 1), 8: Graphic input circuit, 9: Mode switching circuit, 10: Address detection circuit, 11: Selector circuit (2), 12: Accuracy check circuit, 13: Display circuit, 14: 2 Value circuit, 15 compression circuit, 16 input / output interface, 21 drawing board, 101 starting point of drawing, 102 starting point of test chart.

Claims (1)

(57) [Claims] 1. A test chart incorporated in a drawing reading board and having a constant density standard value, a sensor being operated, and operation being substituted when the reading accuracy of the sensor is out of standard. A sensor unit having a backup sensor, a graphic input circuit for reading only the drawing using the sensor unit in the normal mode, and reading the drawing and the test chart using the sensor unit in the test additional mode; A mode switching circuit for controlling switching between a normal mode and a test addition mode in the circuit; and density data of the test chart read by the graphic input circuit when the mode is switched to the test addition mode by the mode switching circuit and stored in advance. Operating from the density standard value of the test chart An accuracy check circuit for calculating the read accuracy of the sensor being operated and checking whether or not the read accuracy is out of specification; and determining that the read accuracy of the operating sensor is out of specification by the accuracy check circuit. A selector circuit that switches the sensor unit to operate with the backup sensor when the sensor unit is read out of the standard when the accuracy check circuit determines that the reading accuracy of the operating sensor is out of standard. And a display circuit for displaying that the backup sensor is operated by the backup sensor.