JP2646333B2 - Incorrect page detection method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting a mismatched signature, and more particularly, to a process for gathering signatures, in which a predetermined signature is supplied to a station of a processing machine. The present invention relates to a detection method and an apparatus for preventing intrusion of different signatures.

[0002]

2. Description of the Related Art Conventionally, a method of detecting a random page and its detection apparatus are known, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 3-44000. In the method of detecting a random page disclosed in this publication, light is applied to a plurality of measurement points on a monitoring paper and a standard paper, and reflected light from each measurement point is received by a plurality of light receiving elements corresponding to each measurement point. The difference between the amount of reflected light on the monitoring paper and the amount of reflected light on the standard paper is calculated for each measurement point.

Further, the arithmetic mean of the reflected light amount on the monitor paper and the arithmetic mean of the reflected light amount on the standard paper are calculated for each two adjacent measurement points, and the difference between the two arithmetic averages is calculated. Among them, the number of differences exceeding a predetermined level is compared with the total number of two types of differences, thereby detecting a misaligned page.

[0004] As an apparatus for performing such a method for detecting a mis-matched page, it is installed on each signature platform of a collating machine.
A sensor section composed of a plurality of optical sensors provided corresponding to the measurement points, an amplifier for amplifying each output from the optical sensor, and an A / D converter for each output from the amplifier in time division A multiplexer to send to the converter and A
A standard memory and a monitoring memory for storing digital signals converted by the / D converter, a level failure detector for comparing the contents of each memory with a predetermined level, and the number and measurement of failure signals from the level failure detector And a defect rate detector for comparing the number of points.

[0005] According to the operation of such a conventional misalignment detection apparatus, the lowermost sheet surface of the standard signature placed on each signature stacking platform is measured by the optical sensor of the sensor unit, and the output is A / D.
The signal is converted to a digital signal by a converter, stored in the standard memory, and the bottom surface of the monitoring signature placed on each signature platform is measured by the optical sensor of the sensor unit, and the output is A.
After converting into a digital signal by the / D converter and storing it in the monitoring memory, a difference between the content of the monitoring memory and the content of the standard memory is obtained for each measurement point.

[0006] The number of defective signals whose difference exceeds a predetermined level is stored in a defective rate detector, and the number of defective signals adjacent to each other is further reduced.
The arithmetic average of the contents of the monitoring memory and the arithmetic average of the contents of the standard memory are calculated for each measurement point, and if the difference between the arithmetic average of the monitoring memory and the arithmetic average of the standard memory exceeds a predetermined level, the The arithmetic mean is stored as a defective signal in the defect rate detector, and the total number of defective signals is compared with the number of all the measurement points to detect a wrong page.

[0007] Japanese Patent Laid-Open Publication No.
The invention disclosed in Japanese Patent Application No. 212987 is also known. In this method, the uniformity of the signature is determined by comparing the measurement of the signature sent to the processing with the measurement of the reference signature already measured. According to this method, when the control of the signature is changed or interrupted, a signal obtained by converting the amount of deviation obtained by the above comparison is used, and this signal is used as a reference obtained optically or electronically. A signature map,
A feature of the present invention is that a mapping of a succeeding signature occupying a position close to the reference signature is formed by converting an amount of displacement at a position searched so as to overlap the most.

[0008]

However, in the case of the above-mentioned conventional misalignment detection method and apparatus, since the density change of the printed paper surface is detected, each of the conventional methods for detecting irregularities, patterns, characters, etc. It is difficult to accurately detect differences between signatures. In other words, even different signatures have very similar comparison densities, making it difficult to judge a wrong signature. Therefore, if the accuracy is to be improved, there is a risk that a non-crawling one, that is, a correct signature may be determined to be a wrong one and an NG signal may be output, thereby significantly reducing the efficiency of the collating operation.

In the latter method of determining the uniformity of signatures, the signature is taken out by a collating grip provided on a take-out drum in order to detect the signature as a map while moving the signature. I'm pulling out. At that time, there is a possibility that the signature may be bent, and there is a problem that it is difficult to detect an accurate map if such a bent occurs.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and it is possible to detect a difference between signatures having different contents even with similar designs without being affected by printing unevenness. It is an object of the present invention to provide a method and apparatus for detecting an incorrect page.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a method for detecting an incorrect page, and has the following configuration to solve the above-mentioned technical problem. In other words, the method for detecting irregular pages according to the present invention includes:
Read the print contents of a normal signature in advance as a mapping, convert it to a digital signal, and match it with the print contents and colors.
The reference value is converted into a reference level and stored in the reference value memory.A part of the signature printed on the signature sent to the collating machine is used as a monitoring surface, and light from a light source is applied to the monitoring surface to perform the monitoring. The image reflected from the surface is captured by a CCD area sensor, the image is converted into a digital signal, output and stored in a comparative value memory, and then the contents of the reference value memory are compared with the contents of the reference value memory based on a preset comparison determination program. It is composed of comparing and judging the contents of the comparison value memory, comparing this judgment result with a preset matching rate allowable value, and dividing the result into good or bad to make a final judgment.

Further, the present invention relates to a random signature detecting device, which converts a mapping of a print content of a normal signature read in advance into a digital signal, and then binarizes the digital signature according to the print content and color. A reference value memory for converting the reference value into a level and storing the reference value; a portion of the signature printed to be sent to the collating machine as a monitoring surface; a light source for irradiating the monitoring surface with light; and an image reflected from the monitoring surface. CCD sensor that captures
A comparison value memory for storing the output signal obtained by converting the image received by the CCD sensor into a digital signal, and comparing and judging the contents of the reference value memory and the comparison value memory to determine a correct signature. It is characterized in that it is determined whether or not it is.

[0013]

According to the present invention, the printing contents information of a normal signature is previously stored in the reference value memory as information set by the operation terminal. That is, the content of a normal signature is read as a mapping, converted into a digital signal, and then stored as a reference value in a binarized level according to the print content and color.

On the other hand, a portion of the signature sent to the collating machine with the printed contents is used as a monitor surface, light from a light source is applied to the monitor surface, and an image reflected from the monitor surface is captured by a CCD sensor. Is converted into a digital signal, output, and stored in the comparison value memory. Then, the contents of the reference value memory and the contents of the comparison value memory are compared and determined based on a comparison determination program set by the operation terminal. This determination result is compared with a preset matching rate allowable value, and the result is divided into good and bad to make a final determination.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the arrangement of a method and an apparatus for detecting misaligned pages according to the present invention; FIG.
FIG. 1 shows a random page detecting device 10 according to an embodiment of the present invention. This irregularity detection device 10 includes a dust-proof hard glass 11 disposed on the lowermost surface of a signature B loaded in a signature magazine A.

A large number of signatures B in the signature magazine A
Is continuously and continuously pulled out from the lowermost stage by the processing machine C installed at the lower part thereof and fed to a collating machine (not shown). Therefore, the printing surface of each signature B, that is, the print content immediately before being pulled out from the signature magazine A by the processing machine C, can be viewed from below through the dustproof hard glass 11. Therefore, the printed contents of each signature visible from the dustproof hard glass 11 are electrically stored in a memory as a monitoring surface. The processing machine C is provided with a trigger synchronization sensor 12.

To explain the storage means in the memory, below the dustproof hard glass 11, a half mirror 13 arranged at an angle of approximately 45 degrees as shown in FIG. Below 13, a light source 14 for irradiating toward the printing surface of the signature disposed on the upper surface of the dustproof hard glass 11 is installed. A light diffusing glass 15 is disposed immediately before the light source 14 in order to make the light from the light source 14 directed to the signature printing surface on the upper surface of the dustproof hard glass 11 uniform.

The light is irradiated from the light source 14 and the light diffusing glass 15
Are transmitted through the half mirror 13 and illuminate the signature print content on the upper surface thereof through the dustproof hard glass 11. As a result, the image of the signature print content is reflected by the half mirror 13, gathered by the lens 16 installed on the optical axis in the reflection direction, and simultaneously enters the CCD area sensor 17 with a changed magnification.

The image of the signature print content incident on the CCD area sensor 17 is converted by a converter 18 into an electric video signal, in other words, a video signal. As described above, the monitoring surface of the signature B is received by the CCD area sensor, and a video signal obtained by converting the image of the image by the converter 18 is further converted into a digital signal by the trigger timing of the trigger synchronization sensor 12 provided in the processing machine C. The digital signal is converted by the converter 19. The mapping of the signature print content converted into the digital signal in this manner is output to the position correcting device 20.
And then stored in the comparison value memory 21.

On the other hand, as information set by the operation terminal, a mapping of a print content of a normal signature which is stationary in a collation pocket is read in the same manner as described above, and is also converted into a digital signal. After that, the threshold value is automatically converted into a binarized level in accordance with the content and color of the print by a threshold automatic variable processing device 22 and is stored in a reference value memory 23. Then, the contents of the reference value memory 23 and the contents of the comparison value memory 21 are compared and determined.

By the way, the significance of correcting the position of the above-mentioned image of the signature print content converted into the digital signal by the position corrector 20 is monitored by the folding position error of the signature B or the guide adjustment in the signature magazine A. Since the position shift of the surface occurs, the position shift of the monitoring surface is compared with the coordinate value of the mapping in the reference value memory, and the data of the comparative mapping is moved to the X, Y, θ coordinates so as to match the coordinates, The comparison value memory 21 stores the reference value memory and the comparison value memory in a coordinate manner. Then, the data in the reference value memory 23 and the data in the comparison value memory 21 are compared and determined.

As a method of comparison and judgment, several kinds of judgment programs are prepared according to the signature printing and selected from the operation terminal. The result of the determination is compared with the allowable value of the coincidence rate set in the operation terminal, and the result is classified into good and bad, and an alarm is output when the result is bad.

[0023]

As described above, according to the method and the apparatus for detecting misaligned documents according to the present invention, a mapping of a normal signature printed portion is captured by using a CCD sensor and converted into a digital signal, while the electronic mapping is performed. Compared with the digitalized mapping of the signature printed part supplied continuously one after another as a reference and the design itself, it is not affected by printing unevenness (to the extent that it is not unsuitable as a printed matter) In addition, it is possible to detect a difference between signatures having different contents (different pages) even with very similar designs.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a configuration of a random page detecting device according to an embodiment of the present invention.

FIG. 2 is a partial configuration explanatory view showing an enlarged main part of the incorrect page detection device shown in FIG. 1;

[Explanation of symbols]

 Reference Signs List A Signature Magazine B Signature C Processing Machine 10 Mismatch Detection Device 11 Dustproof Hard Glass 12 Trigger Synchronization Sensor 13 Half Mirror 14 Light Source 15 Light Diffusion Glass 16 Lens 17 CCD Area Sensor 18 Video Signal Converter 19 Digital Signal Converter 20 Position correction device 21 Comparison value memory 22 Threshold automatic variable processing device 23 Reference value memory

Claims (2)

(57) [Claims] 1. A method in which the printing contents of a normal signature are read in advance as a mapping, converted into a digital signal, and then converted into a reference value to a binarization level in accordance with the printing contents and color, and stored in a reference value memory. A portion of the signature to be sent to the collating machine is used as a monitoring surface, a light from a light source is applied to the monitoring surface, an image reflected from the monitoring surface is captured by a CCD sensor, and the image is converted into a digital signal. Converting, outputting and storing in the comparison value memory, and then comparing and determining the content of the reference value memory and the content of the comparison value memory based on a preset comparison determination program. 2. A method for detecting a misaligned page, comprising comparing with a set allowable value of the matching rate and dividing the result into good or bad to make a final judgment. 2. A reference value memory for converting a mapping of a print content of a normal signature read in advance into a digital signal, and then converting the mapping into a binary value in accordance with the print content and color, and storing the reference value memory. A part of the signature that is sent to the machine is printed as a monitoring surface, and a light source that irradiates the monitoring surface with light,
A CCD sensor that captures an image reflected from the monitoring surface; and a comparison value memory that stores a signal output by converting the image received by the CCD sensor into a digital signal, wherein the reference value memory and the comparison value memory are stored. An incorrect page detection device, which compares and determines the contents of a value memory to determine whether the signature is correct.