Method for application of raster image

FIELD: technological processes.

SUBSTANCE: invention may be used in systems of laser marking and engraving in industry, for artistic applications, for authentication and personification of items and documents. Method for application of raster image consists in the fact that image of original is introduced into computer, image is transformed into raster array of numbers, working element coordinates are changed, working element is put in action, and dots are applied with its help onto surface of item. Working element used is represented by laser radiation. At the same time test image is previously downloaded into computer, and this image is applied onto surface of test sample, produced result is assessed, and laser radiation properties are accordingly adjusted in compliance with it. Multistage filtration of raster array of numbers is carried out, afterwards image of original is marked onto item.

EFFECT: high quality of applied image, increased resource of equipment, higher speed of image application, and also expansion of field of materials suitable for application of images.

6 dwg

 

The invention can be used in systems laser marking and engraving industry for artistic applications, authentication and personalization of products and documents, as an alternative method in photography and printing.

Known "Method of improving a digital image [RF patent №2298226]. It consists in the fact that they perform noise filtering, perform the correction of the global contrast, is extracted from the color image of the luminance component as the maximum of the R, G, components, define the parameters for local adjustment of dark and light tones, perform bilateral filtering the brightness of the image and adjust the dark and light tones in the channel.

This method is not intended for image processing to be applied to any material using laser radiation. This method does not take into account the properties of the substrate materials, tools drawing the image and features of the processes of their interaction.

Known "Method of laser marking" [patent RF №2146200].

He is that by using the laser beam with varying energy density of the laser radiation to form a visible image on the modifying layer. The image formed by the laser in different layers of the application, may be as a whole, and in view of the independent images for each layer and engraving on glass. The laser beam when marking removes common layers and cuts through the substrate through and engrave the product.

In most cases, the quality of the image is unsatisfactory.

The well-known "Method of adaptive halftone halftone original and device for its implementation" [patent RF №2308167]. It is that a two-dimensional signal tone image consisting of a multilevel signal tone areas of the original is converted into a two-dimensional raster signal copies, consisting of two-level tone values of its print and gap elements. For this form the two types of two-dimensional signals of the weighting values of the elements. The first of these weight values are distributed between the elements in any order that is not dependent on changes in the tone, and the second taking into account the geometry of its contours. Duplex signal tone bitmap copies of the form given its values on a comparison of signal values plots of the original with weight values of both types. The second type of two-level signal is placed inside of spatial intervals, the position of which is determined by the signal routing circuit, and the boundaries of the segments are set depending on the number of surrounding elements.

This method requires a lengthy manual selection of the parameters settings the s equipment and image processing. The method does not allow you to get images on the surface of various materials with quality comparable to photographic.

It is known Device for applying a halftone image on a flat surface polished product", which implements the method of applying the image chosen for the prototype [RF patent №2121444].

The method is as follows: enter into the computer the image of the document using a scanner. Convert the original image into a bitmap array of numbers. In a raster dataset contains information on the number of rows in the raster scan, as well as information about the geometric dimensions of the portable image luminance and mechanical characteristics of this type of material. Change the coordinates of the working body (percussion), simultaneously bringing it into effect. Put with the help of the working body by mechanical point on the surface of the workpiece, and the size and location of these points is determined by the properties of the image of the original.

Disadvantages are a small working speed, small equipment life due to intensive mechanical interaction of the working body with the material of workpiece, processing only flat surfaces, low resolution images accounts for the large size of the output pixels.

The objective is to increase the quality of the printed image, increase equipment life, improve the speed of drawing the image, expanding the range of materials, suitable for application images.

A method of applying a bitmap, which is that previously in your computer download the test image is a raster array of numbers and on the surface of a test sample of the same material as the main material is applied to the test image, evaluate the result, and choose the options best image. As a working body of the used laser radiation in accordance with the selected parameters configure its properties. Next, enter the original image, converts this image into a bitmap array of numbers, produce the multi-filter array of numbers, followed by labeling of the filtered image and the original product.

In the computer using the program control of the laser equipment load test image. In the working area laser marking equipment place the workpiece of the same material and with the same surface condition as the product that you want to print. Set up the laser and put a test image with p the power management program laser equipment. This moves the operating point of focus of the laser radiation on the surface of the workpiece in accordance with the program. Simultaneously with moving the point of focus of radiation change the parameters of laser radiation in time, allowing changes the action of laser radiation on the surface of the workpiece. Using a microscope or magnifying glass visually evaluate the result of the marking. Of the various elements of the test image is chosen by those whose contrast is greatest while no traces of charring, melting or changing the surface shape of the workpiece. Write down the parameters of laser radiation and the distance between the points at which the received selected item test image. In the program control the laser equipment enter these settings. If necessary, the measured parameters with reference to the type of material written in a technology database for future use without re-applying a test image on the workpiece. Also in the control program laser equipment enter the original color or grayscale bitmap image that you want to put on the surface of the product. Produce automatic processing - multi-stage filtering on a special multi-stage algorithm with the simultaneity the temporal translation in bitonal format by well-known methods [Pratt U. "Digital image processing", M.: Mir, 1982]. Place in the working field of laser equipment product for applying on it the desired image and produce a marked image on the surface of the product. In the marking laser beam passes through all points caused by the image forming on the surface of the workpiece visible grayscale image.

The document image is printed on the surface of the product, due to the preliminary determination of the properties of the interaction of laser radiation with the selected material and due to the multi-stage filter has a higher quality, namely the maximum reliability of the obtained image. The use of the working body - laser radiation instead of the shock body can increase the life of equipment, increase the speed of drawing the image and to expand the scope of materials suitable for the application of the image.

As an example, consider the process of applying a photographic image on a plate of blackened aluminum. For drawing the image used laser marking machine DMark-06RL LLC LTC Saint Petersburg with the length of the radiation of 1064 nm, average power of 6W, working field 110×110 mm

1. Application of the test image. In the working area of the laser equipment had a plate of black is on aluminum. In the computer in the control program downloaded previously prepared test image in the form of a set of points in units of linear arrays with different step from 20 μm to 1 mm (Figure 1). The program starts to run. On the plate surface by a laser beam is transferred to the test image. (2)

2. Estimation of the parameters of the test image. The operator examines the received test image as the naked eye and with the aid of a powerful magnifying glass or microscope. Selects an item in the test image, which satisfies the conditions of the maximum value of the contrast with no signs of charring or melting the material. (3) Corresponding to the selected element mesh parameters (spacing, the diameter of the elementary point) and settings of the laser equipment (radiated power, frequency modulation, the number of pulses per dot) operator saves for later use in processing the original image and for adjustment of the laser equipment.

3. The obtained parameters - grid spacing of 50 microns, the diameter of the point 50 μm is passed to the software module (filter). At the same time on the obtained parameters - power radiation 48% from the maximum modulation frequency of 70 kHz, the number of pulses on one point - 1 set laser equipment.

4. Conducting the automatic multi-stage filtering of the original image (Figure 4) using the program module (now part of M-Script), produces the following:

Intermediate processing results are shown for clarity of the process.

4.1. Make preliminary adjustments of brightness and contrast of the image. If necessary, destroyed the color information (the image is converted from color to grayscale).

4.2. Calculates the entropy of the image and it is removed unnecessary information.

4.3. Re-adjust brightness and contrast of the image (zoom histogram).

4.4. Taking into account measured using a test image parameters, the gain contours of the image.

4.5. The image is translated into a bitonal format.

4.6. Is thinning and the noisiness of the image. The resulting image (Figure 5) ready to spray using laser equipment.

5. Produce a drawing of the image. In the working area of the laser units plate, which will be applied to the image. The processed image is loaded into the control program equipment and produce coded to produce the final image as a grayscale bitmap image (Fig.6).

6. Assessment of the quality of the received image. The resulting image looks very good as the picture of average quality. Sometimes a few at the ussite result due to the additional selection in the limited range of parameters of laser radiation. The left image obtained by the method of laser marking by transferring the image to bitonal format standard means without prior processing. The image on the right obtained by the method of laser marking with the application considered here, the algorithm takes into account the properties of the process of interaction of laser radiation with the material. The obtained images of the original are of good quality, close to the photographic.

The method of applying a bitmap, which consists in the fact that the computer enter the document image, converts the image into a bitmap array, change the coordinates of the working body, lead a working body in action and deal with it the points on the surface of the product, characterized in that the working body using laser radiation that is preloaded into the computer, load the test image and put that image on the surface of the test sample, evaluate the result and in accordance with this configures the properties of laser radiation, produce a multi-stage filtering of raster array of numbers, followed by a labeled image of the original product.



 

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