Method for automatic control by means of an optoelectronic device

 

(57) Abstract:

The invention relates to a method of control using optoelectronic devices-quality print images on paper. The invention consists in the following. Using known means and methods, prepare several reference images. Each reference image has a relative maximum misalignment of the various figures that comprise the image. Under various drawings see drawings, printed during the different phases of printing. When control of the controlled image compare it with the closest reference sample. The technical result, which directed this invention is to provide opportunities facilitate automatic control. 6 C.p. f-crystals, 3 ill.

The invention relates to a control method using optoelectronic devices quality image is printed on paper that contains at least one drawing, printed during one phase of printing.

When the print quality on paper and, in particular, securities used electronic means to automatically test that contains one or more black-and-white or colored kazimi, which represent the intensity of reflected light or, in other words, dosimetrically value (the measured value of the density) of the image elements, which is divided image. The number of picture elements belonging to a single image depends on the resolution of the camera. In a monochromatic system (black and white) image is described by only one matrix, while in polychromatic systems, the number of matrices forming the image, is equal to the chromatic number of channels. Typically, for a description of the type of RGB (red, green, blue) used three chromaticities channel.

Used to implement this type of automatic control methods are based on the following schema.

From a group of sheets, which are considered as high-quality, creates a sample acceptable printing quality. To create the sample uses a variety of technical tools and techniques. For example, relying on a group (pack) sheets, which are considered as qualitative, some semblance of the averaged image, i.e. the image that is described by a single matrix, in which each picture element is reported to sridhama the picture element attached two values, one value is the minimum attainable value in the reference group sheets, and the other value is the maximum value. Thus, for each image is provided by two matrices: one matrix with the minimum value and the other with the maximum value. In the case of a single polychromatic image in the color channel receive two matrices.

When forming the scanned images of each item scanned image is compared with the picture element thus obtained sample. If the difference exceeds a certain threshold, or if the difference is outside the minimum and maximum values, it is considered that the item is defective printing. Based on the number of defective picture elements is determined by the necessity of removing the image depending on the quality that is wanted and which has been pre-defined.

In the manufacture of certain types of valuable printed products, such as securities, Bank notes, postage stamps, and so on, images are printed using various methods, such as offset printing, engraving and so on, These types of printing called printing according to the first phase and is applied to the first image and then the paper is fed to the second printing system to execute the second phase of printing, which allows to put the second picture. In this case, abstracting from printing quality, there is the same problem entered in the corresponding register of the images printed during the different phases. Indeed, between two printed images can be variances concerning prints, printed during the different phases and not only because of the deformation of the paper. These movements affecting some elements of the image can occur both in the direction of the paper and in the perpendicular direction. In this case, it is not possible to identify a pattern representing the desired print quality using the previously mentioned methods, since the same image element can give very different values depending on the alignment and register between phases printing.

In this case, it is proposed to simulate a sample of each phase. To this end the group reference sheets include a group of sheets that are printed only or mainly with each of the phases of printing. Using a method similar to the above methods, form the sample for each phase of printing. During the phase of preparation of samples the operator is CLASS="ptx2">

When the production first of all measure the mutual misalignment between phases printing using the image elements, which were identified during sample preparation.

Then the samples are combined, taking into account the fact that different phases were printed successively on the sheet to obtain a single reference sample descriptions, which corresponds to the description of the drawings in the scanned images. Then compare each image with the thus obtained sample. This method is complicated and expensive, as it involves the necessity of printing for each set of products such number of groups of sheets, providing an acceptable quality of printing, as there are phases of printing.

A known method for automatic control by means of an optoelectronic device quality image printing on paper that contains at least one drawing, printed during one phase of printing (see application EPO 0444583, class B 41 F 33/00, 1991).

The disadvantage of this method is the inability to facilitate automatic control.

The technical result, which directed this invention is the provision of W, in the method for automatic control by means of an optoelectronic device quality image printing on paper that contains at least one drawing, printed during one phase of printing, according to the invention are preparing multiple samples from individual valid coaxial ties and make a comparison of the printed images with the closest reference sample, or with the closest reference samples, as well as due to the fact that the reference samples are made from the reference images, each image has a maximum misalignment, and, in addition, due to the fact that the form of the reference samples for each picture, printed during one phase of printing, combine reference samples of each figure with the formation of the monitored image for various and valid relative soonest, and also due to the fact that when you choose control reference samples by selection of a predetermined number of picture elements of the reference samples and the corresponding image elements in controlled images.

This technical result is achieved due to the fact that the criminal code provided that any such misalignment is a relative misalignment values optoelectronic devices and controlled image, you can reduce noise associated with the selection of sample values during the formation of the reference sample or quality control, and, in addition, due to the fact that additionally prepare reference samples for each picture, each sample corresponds to one possible relative misalignment of the electronic device and pattern, and the magnitude of the misalignment is less than the size of the image elements optoelectronic devices.

In this control method according to the invention are preparing multiple samples, each of which corresponds to one allowable misalignment, thus producing a comparison of the printed image with the closest reference sample or with the closest reference samples.

The advantage of this method lies in its great flexibility when forming the reference samples. Indeed there are many ways to prepare reference samples with a valid coaxial ties, for example, there is the possibility of using suitable methods, to select the reference samples of each pattern and then forming the reference image, by combining these figures with relative coaxial ties, finding the identical printing. A sample of each pattern can be obtained by using known means.

According to a preferred variant implementation of the invention, reference samples can be obtained from the reference images, with each image represents one allowable misalignment.

According to another variant of execution used in the control samples chosen by way ensuring the best match of predetermined picture elements of the reference samples of the image elements that match the specified elements on the monitored image (the best selection of pairs).

The advantage of the present invention is that it allows also to reduce the interference in the allocation of sample values that can affect the results, when misalignment (alignment is poor) optoelectronic devices recollection or controlled image smaller than the image element mentioned devices. Indeed, under such control, if the black line is accurately centered on the sensor, or has a slight deviation, the accepted values of the density measurement will be different.

I can also run for each picture, forming the image reference samples corresponding to the deviation, which features smaller than the picture element optoelectronic devices. Thus, when control is poor alignment of the camera relative to the image will not distort the results of the control.

This method implies that at the initial stage of active use of the storage device of the electronic system, however, is not required to perform any calculations on the validation phase. Hence, the method is carried out at a higher speed.

Further, the image will be described in more detail with reference to accompanying drawings (figs. 1, 2, 3), while Fig. 1 and 2 depict two controlled image consisting of two different images, the mutual position of which are different.

Fig. 3 depicts a diagram of an installation for implementing the method.

In Fig. 1 shows an image consisting of a single triangle T1 and one rectangle P1. Each of these drawings was printed during a single phase of printing, for example, the triangle was printed using offset printing, and the rectangle was obtained using the and rectangle P2, also printed, respectively, the offset printing method and phase of the printing engraved matrix, with the only difference of the two images is different mutual relative positions of the rectangle and triangle. On the specified drawing misalignment for clarity increased. In fact, the misalignment is only a few image elements.

According to the claimed method, the quality control and, in particular, control of misalignment of the two images that make up the image, is carried out by comparing each of the images presented in two figures with the reference patterns, which consist of triangles and rectangles, the relative misalignment of which are within the predefined acceptable range.

Camera 2 checks before passing it leaves 1, and the received image is supplied to the device 3, which is a measure of the magnitude of the misalignment. The specified amount of misalignment is passed to a storage device that stores all samples with a valid coaxial ties. This allows you to choose the appropriate sample, which is then sent to the device 5 comparison. The quality of the printing is reflection, obtained by the camera 2.

Obviously, this device requires the use of a storage device large capacity, since the latter is used to store all the samples with a valid coaxial ties; however, you do not need to perform the calculation in the control process, since it is sufficient to identify the sample with the corresponding misalignment selected by the device 3 for giving him the means of quality control.

The production of these reference samples is based on the quality of the printing. Thus, when the set tolerances printing (maximum misalignment), reference samples are produced either by calculation or on the basis of the number of valid reference sheets, images which are taken in the storage device of the electronic system. With the passage of the image such as the image shown in Fig. 1 or 2, the specified image is compared with the closest reference sample, and if the difference is equal to zero or is within predefined limits (tolerances), the image is accepted, otherwise it is discarded.

The reference image can be shoaiba, either way, according to the present invention and re-form the image with different relative coaxial ties within specified tolerances.

It seems obvious that the accuracy of the system is determined by the number of used reference samples. For sampling, which should be used for quality control, you can use the method of matching samples and controlled image with some pre-installed image elements. In the case of images, presented in two figures, it is possible to use, for example, the bottom corner of the triangle and the upper remote corner of the rectangle, which we denote by A1, A2. Thus, when the control will try to combine image elements A1 and B1, or A1 and A2 of the controlled sample with the corresponding image elements in the reference samples.

This method also allows you to compensate for the interference in the allocation of selected values that arise as a result of changes in the relative position of the camera and accept or controlled image. Indeed, the alignment of the camera and the monitored or received image is not shown is the considerations applying is exactly in front of the sensor, it adopted dosimetrically value differs from dosimetrically width the same black line, slightly offset by the amount less than the width of the image element.

To eliminate this effect it is necessary to eliminate the causes misalignment of the camera and image, using the same method, i.e., to produce a certain number of reference samples, taking into account the misalignment of the cameras and image, i.e., such misalignment, which is precisely limited by the size of the picture element. In this case, it is possible to produce samples with, for example, misalignment, comprising 0.5 picture element with a step equal to 0.1 per picture element in two directions x and y. Thus, for the above case creates a block of 121 samples stored in a storage device, such as device 4 shown in Fig. 3, which can be used for the selection of identical samples and quality control testing. In this case, does not require a significant increase in the complexity except for the electronic storage device.

It is obvious that the method based on the use of large numbers of samples to reduce Bosnia, because you only need to make a few reference samples corresponding to different soonest camera and picture for each phase of printing.

The use of this invention allows to provide a simplified automatic control.

1. Method for automatic control by means of an optoelectronic device quality image printing on paper that contains at least one drawing, printed during one phase of printing, characterized in that prepare several reference samples with individual valid coaxial ties and make a comparison of the printed images with the closest reference sample or with the closest reference samples.

2. The method according to p. 1, characterized in that the reference samples are made from the reference images, each image has a maximum misalignment.

3. The method according to p. 1, characterized in that the shape of the reference samples for each picture printed during one phase of printing, combine reference samples of each figure with the formation of the monitored image for various and valid relative soonest.

4. Spasmodic a predetermined number of picture elements of the reference samples and the corresponding image elements in controlled images.

5. The method according to p. 1, characterized in that the misalignment is less than the value of the picture element optoelectronic devices.

6. The method according to p. 5, characterized in that the misalignment is a relative misalignment values optoelectronic devices and controlled the image to reduce noise associated with the selection of sample values during the formation of the reference sample or quality control.

7. The method according to any of paragraphs.1 - 6, characterized in that it further prepare reference samples for each picture, each sample corresponds to one possible relative misalignment of the electronic device and pattern, and the magnitude of the misalignment is less than the size of the picture element optoelectronic devices.

 

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