The currently used misprint detection methods can be roughly classified into several types: photoelectric sensor for color patch position inspection, graphic and text gray check, bar code inspection, and visual photographic inspection.
Color position detection error
Detecting the position of the color patch is a relatively simple method of detecting the wrong frame, which has been widely used on Ziguang's collating machine.
Its working principle is that different signatures print black icons at different positions on its spine, and photoelectric sensors are used to detect the position of the black icons to determine whether there are different signatures wrongly placed in the workstation.
The advantages of this method are: simple structure and low price.
The disadvantages are: the requirement for the printing of black icons on the spine and the adjustment of photoelectric sensors are high. This requires not only the accuracy of the signatures provided by the previous procedure, but also the need for the operator to have more experience in the adjustment of the photoelectric sensors. , And must keep the photoelectric sensor from being contaminated by paper and paper dust; the reliability of checking the wrong posts is not very high. If the signatures are thin, the color marks on the spine of the book will be narrower, and the wrongly placed signatures will be mixed in. It is difficult to find out, and the fact that the signatures are not well-placed can cause missed inspections.
Graphic and grayscale detection error
The working principle of detecting the wrong frame by the difference of the graphic gray scale is to use the photoelectric sensor to sample the gray value of the graphic and text in the signature. Compare it with the standard value in the pre-existence detection instrument. If the difference between the two is greater than the set threshold, the instrument will consider this signature as wrong. According to the size of the gray difference of different signatures, high-precision, medium-accuracy, and low-precision detection can be selected on the meter, and different thresholds can be set. This method is especially suitable for signatures with colored patterns and comics.
The advantages of this method are: moderate price, has been accepted by many users; the instrument is embedded in the pager of the saddle stitching linkage line, and the functions of the alarm and wrong post stop can be effectively controlled with the saddle stitching linkage electric control function. Combined together, the overall appearance; can be easily installed on the purple saddle stitching linkage line.
Disadvantages are: due to the text grayscale detection error is in the specified range of graphic gray value detection and comparison, so require the operator to stack the book in the book bucket must be neat, folding must also be neat, or the signature The relative position in the detection area may move, resulting in the error caused by the difference between the standard gray value is too large; the darkness of the ink on the same signature is required to be basically the same, otherwise the meter will mistakenly believe that the gray value of the signature is different and cause errors. Inspection, thus increasing the number of parking, affecting work efficiency; if the printed text is all small text, the gray value of the signature in the detection area does not change much, the false detection rate may be very high, resulting in the machine often parking, Using this check method will not be suitable.
Barcode detection error
If the use of graphic and grayscale detection of false posts has a high false positive rate, it is recommended to use barcodes to detect misprints.
The working principle is that different barcodes are printed on the long and short sides of different signatures. Through the recognition of the barcode readers, compared with the standard barcodes, it is convenient to distinguish whether there are any wrong posts in the binding process.
The advantage of this method is that it can be installed on many book binding devices, the application range is wider than the graphic gray scale detection, and more kinds of misrecognitions can be identified; it has already begun to be applied on the purple light saddle stitching linkage line.
Disadvantages are: As the barcode must be cut off at the end, it will increase the loss of the paper; during the inspection and debugging process, the installation position of the barcode reader has a certain limit, it needs to change along with the change of the barcode position on the signature, and the improper debugging will also Misdetection and missed detection.
CCD image detection error
CCD image detection error is a more advanced method among the several methods used by the binding device to detect misprints. Its working principle is: Record a standard template image in advance in the detector, perform necessary spectral transformation and data processing, store it in the specified memory address, and use high-definition, The high-speed camera lens captures the contents of the signature online, compares it with the template image after necessary data processing, and determines whether the position of the signature is correct based on the degree of similarity between the two, and the degree of similarity can be performed in the instrument. Settings.
The advantages of this method are: it is more objective, reasonable, and accurate to detect the wrong posts; the orderliness of the signatures placed in the book bucket and the accuracy of the folder folding requirements are looser than that of the gray detection errors. Much more.
The disadvantage is that the device price is relatively expensive, and it is currently not widely available.
Color position detection error
Detecting the position of the color patch is a relatively simple method of detecting the wrong frame, which has been widely used on Ziguang's collating machine.
Its working principle is that different signatures print black icons at different positions on its spine, and photoelectric sensors are used to detect the position of the black icons to determine whether there are different signatures wrongly placed in the workstation.
The advantages of this method are: simple structure and low price.
The disadvantages are: the requirement for the printing of black icons on the spine and the adjustment of photoelectric sensors are high. This requires not only the accuracy of the signatures provided by the previous procedure, but also the need for the operator to have more experience in the adjustment of the photoelectric sensors. , And must keep the photoelectric sensor from being contaminated by paper and paper dust; the reliability of checking the wrong posts is not very high. If the signatures are thin, the color marks on the spine of the book will be narrower, and the wrongly placed signatures will be mixed in. It is difficult to find out, and the fact that the signatures are not well-placed can cause missed inspections.
Graphic and grayscale detection error
The working principle of detecting the wrong frame by the difference of the graphic gray scale is to use the photoelectric sensor to sample the gray value of the graphic and text in the signature. Compare it with the standard value in the pre-existence detection instrument. If the difference between the two is greater than the set threshold, the instrument will consider this signature as wrong. According to the size of the gray difference of different signatures, high-precision, medium-accuracy, and low-precision detection can be selected on the meter, and different thresholds can be set. This method is especially suitable for signatures with colored patterns and comics.
The advantages of this method are: moderate price, has been accepted by many users; the instrument is embedded in the pager of the saddle stitching linkage line, and the functions of the alarm and wrong post stop can be effectively controlled with the saddle stitching linkage electric control function. Combined together, the overall appearance; can be easily installed on the purple saddle stitching linkage line.
Disadvantages are: due to the text grayscale detection error is in the specified range of graphic gray value detection and comparison, so require the operator to stack the book in the book bucket must be neat, folding must also be neat, or the signature The relative position in the detection area may move, resulting in the error caused by the difference between the standard gray value is too large; the darkness of the ink on the same signature is required to be basically the same, otherwise the meter will mistakenly believe that the gray value of the signature is different and cause errors. Inspection, thus increasing the number of parking, affecting work efficiency; if the printed text is all small text, the gray value of the signature in the detection area does not change much, the false detection rate may be very high, resulting in the machine often parking, Using this check method will not be suitable.
Barcode detection error
If the use of graphic and grayscale detection of false posts has a high false positive rate, it is recommended to use barcodes to detect misprints.
The working principle is that different barcodes are printed on the long and short sides of different signatures. Through the recognition of the barcode readers, compared with the standard barcodes, it is convenient to distinguish whether there are any wrong posts in the binding process.
The advantage of this method is that it can be installed on many book binding devices, the application range is wider than the graphic gray scale detection, and more kinds of misrecognitions can be identified; it has already begun to be applied on the purple light saddle stitching linkage line.
Disadvantages are: As the barcode must be cut off at the end, it will increase the loss of the paper; during the inspection and debugging process, the installation position of the barcode reader has a certain limit, it needs to change along with the change of the barcode position on the signature, and the improper debugging will also Misdetection and missed detection.
CCD image detection error
CCD image detection error is a more advanced method among the several methods used by the binding device to detect misprints. Its working principle is: Record a standard template image in advance in the detector, perform necessary spectral transformation and data processing, store it in the specified memory address, and use high-definition, The high-speed camera lens captures the contents of the signature online, compares it with the template image after necessary data processing, and determines whether the position of the signature is correct based on the degree of similarity between the two, and the degree of similarity can be performed in the instrument. Settings.
The advantages of this method are: it is more objective, reasonable, and accurate to detect the wrong posts; the orderliness of the signatures placed in the book bucket and the accuracy of the folder folding requirements are looser than that of the gray detection errors. Much more.
The disadvantage is that the device price is relatively expensive, and it is currently not widely available.
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