JPH01209869A - Original reading controller - Google Patents

Abstract

PURPOSE:To prevent the input of abnormal picture data and to constantly input normal picture data by stopping the scanning of an original and displaying that a light source is abnormal when the light source is decided to be abnormal. CONSTITUTION:A lighting identifying circuit 11 decides whether the white data of inputted binary data is more than 50% of a whole or not, if it is below 50%, it decides that any abnormality is generated and informs the result to a reading system control part 6. Then, the control part 6 decides whether the picture data is normal or not and when it is not normal, the control part 6 executes counting. When the counted value is decided to be n-th times, the control part 6 makes a light source abnormality display circuit 12 display the abnormality and stops the setting of the original 2 to its scanning position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a document reading control device that reads image data from a document by turning on a light source of a document reading section of a facsimile machine.

(Prior Art) Conventionally, the configuration of a reading system of a facsimile machine is as shown in FIG. A document 2 placed on a back plate 1 is illuminated by a light source 3 such as a fluorescent lamp. This light source 3 is driven by a light source drive circuit 4, and the light source drive circuit 4 is driven by a lighting control circuit 5.
controlled by In response to a command from the reading system control section 6, the lighting control circuit 5 operates the light source drive circuit 4 to turn on the light source 3. The light emitted from the light source 3 hits the document surface and is reflected, and this reflected light enters the photoelectric conversion circuit 7 where it is photoelectrically converted and becomes image data. 'The gain of this image data is adjusted to a constant level by the AGC (automatic gain adjustment) circuit 8, and the gain is further adjusted to a constant level by the ACC (automatic contrast adjustment) circuit 8.
After its contrast is adjusted by circuit 9, 2
The signal is input to the value conversion circuit 10. The binarization circuit 10 binarizes the input image data into black and white binary data, and outputs this binarized data to the reading system control section 6.

Figure i4 is an operation flowchart of the reading system control section 6. When it is confirmed in step 401 that the original 2 is set in the reading section, the light source 3 is confirmed in step 402.
issues a command to turn on the light. Next, after waiting for a certain period of time in step 403, the original is set at a scanning position in step 404, and then scanning of the original is started (binary data input) in step 405.

However, in the conventional document reading control device of a facsimile machine as described above, even if the light source does not turn on due to an abnormality in the light source 3 or the light source drive circuit, or the amount of emitted light is small and the light does not reach the document 2, Since scanning of the document is started immediately, there is a drawback that abnormal image data is read.

(Problem to be Solved by the Invention) In the above-mentioned conventional document reading control device of a facsimile machine, the document scanning is started unconditionally after a certain period of time after the light source is turned on, and image data is read. Therefore, due to an abnormality in the light source or the light source drive circuit, the light source may not turn on or the light intensity may decrease abnormally.
Alternatively, even if it takes an abnormally long time for the light source to turn on, there is a drawback that the image data obtained by scanning the original is inputted as is. SUMMARY OF THE INVENTION Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and provides a document reading control device that can prevent the input of abnormal image data and always input normal image data to perform smooth document reading control. It is an object.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a document reading control device that obtains image data by photoelectrically converting reflected light from the document obtained by irradiating the document with light from a light source. scan control means for scanning the original after turning on the light source and obtaining image data by reading a predetermined portion other than the original before starting reading; a light source abnormality determining means for determining whether the light source is normal or abnormal by comparing it with a predetermined reference value; and when the light source abnormality determining means determines that the light source is abnormal, scanning of the document is stopped and the abnormality of the light source is detected. The abnormality display control means is configured to display an abnormality display control means.

(Function) In the document reading control device of the present invention, the scanning control means scans the document and, before starting reading, reads a predetermined portion other than the document to obtain image data, and passes the image data to the light source abnormality determination means. The light source abnormality determining means compares the image data obtained from the scanning control means with a predetermined reference value to determine whether the light source is normal or abnormal, and notifies the abnormality display control means of the determination result. When the light source abnormality determination means determines that the light source is abnormal, the abnormality display control means stops scanning the document and displays a message indicating that the light source is abnormal.

As a result, when the light source is abnormal, there is no need to read abnormal image data, and appropriate repair measures can be taken immediately upon learning of the abnormality of the light source.

(Example) An example of the present invention will be described below with reference to the drawings, in which the same parts as those of the conventional example are denoted by the same reference numerals. FIG. 1 is a block diagram showing an embodiment of the original reading control device of the present invention. 1
is a back plate with whiteness equivalent to that of a white original, 2 is an original, 3 is
4 is a light source that illuminates the original 2; 4 is a light source drive circuit that drives the light source 3; 5 is a lighting control circuit that controls the light source drive circuit 4;
Reference numeral 6 denotes a reading system control unit that controls the input of image data by feeding the original, turning on the light source, etc., 7 a photoelectric conversion circuit that photoelectrically converts the light reflected from the original 2, and 8 converting the level of input image data. 9 is an ACC circuit that adjusts the contrast of the input image data; 10 is a binarization circuit that binarizes the input image data into white and black; 11 is a circuit that controls whether the light source 3 is turned on or off. A lighting identification circuit 12 is a light source abnormality display circuit that notifies an abnormality of the light source 3.

Next, the operation of this embodiment will be explained according to the flowchart shown in FIG. When the reading system control unit 6 recognizes that the original 2 has been set in step 201, it issues a lighting command for the light source 3 to the lighting control circuit 5 in step 202. As a result, the lighting control circuit 5 turns on the light source drive circuit 4 and lights the light source 3. Next, the reading system control unit 6 waits for a certain period of time in step 203.
Go to step 204. In step 204, the back plate 1 is scanned to input image data (same as the read data), and this is sent to the lighting identification circuit 11. At this time, the light from the light source 3 reflected by the back plate 1 is photoelectrically converted into image data by the photoelectric conversion circuit 7, and then the level and contrast are adjusted by the AGC circuit 8 and the ACC circuit 9. ,2
It is binarized by the digitization circuit 10 and sent to the reading system control section 6.
is input. The lighting identification circuit 11 determines whether the white data of the input binary data is, for example, 50% or more of the total, and if the white data is 50% or more, the light source is lighting normally. If it is 50% or less, it is determined that some abnormality has occurred, and the reading system control unit 6 is notified of the result. Therefore, in step 205, the reading system control unit 6 determines whether the image data is normal or not. If it is normal, the process goes to step 208, and if it is not normal, the process goes to step 206.

In step 208, the document 2 is fed to the scanning position, scanning is started, reading control is performed, and the post-processing is ended. In step 206, it is determined whether or not the process in step 205 is the nth time, and if it is less than the nth time, step 207 is performed.
The process returns to step 204, which is delayed for a certain period of time. If it is determined in step 207 that the process in step 205 has been performed for the nth time, the reading system control unit 6 causes the light source abnormality display circuit 12 to display an abnormality display in step 209, and in step 210, the reading system control unit 6 causes the light source abnormality display circuit 12 to Setting at that scanning position is stopped and the process ends.

Note that in step 20B, the process of step 205 is
If the data obtained by scanning the back plate 1 is abnormal, it is determined whether the reading data of the back plate 1 in step 204 is repeated n times and the light source 3 is still correctly lit. This is to perform the processing from step 209 onwards if the process is not possible.

According to this embodiment, before starting scanning of the original 2, the back plate 1 is scanned to determine whether the light source is normal or abnormal, and if abnormal, the scanning of the original is stopped, so that abnormal data cannot be read. can be prevented. Furthermore, in the event of an abnormality, the light source abnormality display circuit 12 can notify the operator of the abnormality, so that the abnormality in the facsimile machine can be quickly repaired by taking appropriate measures.

[Effects of the Invention] As described above, according to the document reading control device of the present invention,
This has the effect of preventing the input of abnormal image data and always inputting normal image data to perform smooth document reading control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the document reading control device of the present invention, FIG. 2 is an operation flowchart of the reading system control section shown in FIG. 1, and FIG. 3 is a conventional document reading control device. FIG. 4 is a block diagram showing an example of the operation of the reading system control section shown in FIG. 3. 1... Back plate 2... Document 3... Light source 4... Light source drive circuit 5... Lighting control circuit 6... Reading system control section 7... Photoelectric conversion circuit 10... Binarization circuit 11...Lighting identification circuit 12...Light source abnormality display circuit Representative Patent attorney Noriyuki Chika Yudo Sanno - 2 Kikusunoki 1゛11shi Figure 1

Claims (1)

[Claims] In a document reading control device that obtains image data by photoelectrically converting light reflected from the document obtained by irradiating the document with light from a light source, after turning on the light source and before scanning and reading the document. scan control means for obtaining image data by reading a predetermined portion other than the original document; and a light source abnormality for determining whether the light source is normal or abnormal by comparing the image data obtained from the scan control means with a predetermined reference value. The present invention is characterized by comprising a determining means, and an abnormality display control means for stopping scanning of the document and displaying an indication that the light source is abnormal when the light source is determined to be abnormal by the light source abnormality determining means. A document reading control device.