Way of forming of symbols for microprinting

FIELD: physics, computer technology.

SUBSTANCE: invention concerns area of computer technology and can be applied in the user colour and black-and-white printers and multipurpose printers. The way of forming of symbols for microprinting includes definition of the suitable font size for each symbol of the image considering rules of forming of small fonts. Also symbol rasterisation in a bit card is performed, a bit card is skeletonised, a bit card is reformatted with preservation of symbol legibility, semitoning cells of the reformatted bit card are formed.

EFFECT: dilation of a scope and improvement of convenience of using at the decreased volume of used memory.

8 cl, 15 dwg

 

The invention relates to the field of computer technology, in particular to methods continuous visual monitoring of the output data, and more specifically to methods of forming characters for the microprinting, and can be applied in modern custom color and black and white printers and MFP (multi-function printing devices), eliminating the need to use special microscripts.

Microprinting serves as protection against counterfeiting and unauthorized copying, because the text is so small it is very hard to copy exactly when you try to counterfeit banknote or other document on which it is printed. When the banknote or document is inserted into the photocopier or scanner to a computer, line with micro-printed text will be perceived by the copier or scanner as a dashed line, which will then be in the same form reproduced on a counterfeit banknote or document when printed. Microprinting also will not be accurately reproduced with forgery and unauthorized duplication with offset printing machine, because the text is too small for engraving on the printing plates using well-known methods, by the public or by counterfeiters. Therefore, microprinting, applied together with other methods to protect the s from counterfeiting banknotes and documents, basically serves to confirm the authenticity of the printed banknote or document. In addition, the use of the microprinting widespread in the manufacture of documents that are protected from copying. Examples of solutions involving the microprinting can be found, for example, in U.S. patents№№5,823,576 [1], 6,045,656 [2], 7,152,047 [3], 7,270,918 [4].

For the microprinting use professional offset device. It is often impossible to print readable text font size in one of the printing point and less by applying normal fonts and custom printing devices. Size printed in one printing point symbols are significantly distorted and almost illegible.

Usually for the microprinting use special microscript. However, each microlettering contains a limited set of characters, for example, only for multiple languages, and it is impossible to print any character in General. To store microscripts more memory is needed. Creating microscript is a long and complex Autonomous process.

Closest to the claimed invention is a method and system print microtext described in laid patent application U.S. No. 20070252838 [5], in which there is a special micro-font based on the font PostScript Type 3. This method is chosen as a prototype C is shown of the invention. The prototype has the following disadvantages: special microfont create Autonomous, which impairs the usability and requires more memory to store the generated microshift; microfont has a limited character set, which limits the scope of its application; for the microprinting require special printers that can print with high resolution, which also narrows the scope of application of the method of the prototype and usability.

The present invention is to provide a method of forming microtext characters with expanded scope and with improved ease of use by reducing the amount of memory used.

The problem is solved by creating a method of forming characters for the microprinting, in which for each character in the image determine the specific font size, taking into account the rules of formation of small fonts, characteristic of which is that it will rasterize symbol in the bit map, skeletonizing bit card was reformatted bitmap preserving the intelligibility of the character, form cell protonirovaniya of the reformatted bitmap.

For complete method makes sense to skeletonistov bitmap, used parallel refinement.

the La complete method makes sense to reformatted bitmap, producing multiple reduction, it was determined the significance of the pixels, and at each stage of reduction was removed, at least one combined group of less significant pixels in the vertical or horizontal direction.

For complete method makes sense in order to select less significant pixels did a graph on a regular grid on Arte values, and use it solved the problem of finding a path on a graph, using a dynamic programming algorithm that minimizes the cumulative cost of the path.

For complete method makes sense, that determined the significance of the pixels, using a cost function, in which the white background pixels have the lowest cost, end or branching pixels of the frame have high or higher value depending on the distance to each of them, the other pixels of the frame of the character image have an average cost depending on distance from the nearest end or branching pixels.

For complete method makes sense to cell protonirovaniya formed from one reformatted bitmap.

For complete method makes sense to cell protonirovaniya formed from multiple reformatted bitmap.

For the imp is in way makes sense to the cell protonirovaniya formed from a fragment of the reformatted bitmap.

The technical result of the claimed invention is the expansion of the scope, improving usability and reducing the amount of memory required for execution of the method.

For a better understanding of the claimed invention the following is a detailed description with the appropriate drawings.

Figure 1 - block diagram-step method of forming characters for the microprinting, made according to the invention.

Figure 2 - an example of processing two characters using the method of forming characters for the microprinting, made according to the invention.

Figure 3 - example of construction of the trajectories to remove one vertical and one horizontal line.

Figure 4 is an example script in the Postscript language to print microtext character through the formation of cell protonirovaniya.

5 is a block diagram of a method of microprinting, using the method of forming characters for the microprinting, made according to the invention.

Let's step through the execution of the proposed method (Figure 1) on the example of two characters images, shown in figure 2. In the first step (101) choose a suitable font size, taking into account the rules of formation of small fonts. When choosing a font observe a tradeoff between the size of b is postal card and the appearance of characters. In the second step (102) performs the rasterization of the characters in the bit map, i.e. in the image (Fig, 2.4), using the selected font size. The character is always rasterized as black pixels in the foreground on a white background, or white pixels on black, it does not take into account the color of the original character and background.

In the third step (103) executes skeletonization bitmap, while many existing algorithms skeletonization (refinement, build the skeleton) is preferably used one of the technologies of parallel refinement described in the article (Louisa Lam, Seong-Whan Lee, and Ching Y.Wuen, "Thinning Methodologies - A Comprehensive Survey", IEEE Tr. PAMI, vol.14, no. 9, pp.869-885, 1992)

[6]. The result of skeletonization bitmap shown in Fig and 2.5.

On the fourth step (104) was reformatted bitmap to preserve the legibility of symbols and produce multiple iterative reduction of bit maps and stages of reduction determine the significance of the pixels and remove pixels with low significance. To prevent distortion, at least one combined group of less significant pixels in the vertical or horizontal direction is determined at each stage of reduction. The fourth step is to repeat this each reduces the step of removing at least one combined group of symbols to obtain the new is the opium of the bitmap resized. Then the received bit map is used as input for the next iteration and the process is repeated to obtain the desired size. The significance of the pixel define cost function, in which the white background pixels have the lowest cost, end or branching pixels of the skeleton portion of the image have high or higher value depending on the distance to each of them, the other pixels of the frame have the average cost depending on distance from the nearest end or branching pixels. Due to the removal of pixels changing distances and, consequently, the value of the pixels. Calculate map value, where each element represents a pixel value in the bitmap. It is used to assign the weights of arcs of the graph, which is directed to the map element value. To solve the problem of finding the optimal connection path in a vertical or horizontal direction on the map cost to build a graph on a regular grid. The optimal path is defined as the path with the minimum cumulative cost. This trajectory can be found by using dynamic programming algorithm (one of the matching algorithms described in the article by Shai Avidan, Ariel Shamir, "Seam Carving for Content-Aware Image Resizing", ACM Transactions on Graphics, Volume 26, Number 3, SIGGRAPH 2007) [7]. On Fig and 2.6 shows o the derivative reformatted the character image to bitmap 8×8 pixels.

Figure 3 shows an example of assigning values to the pixels, and build paths to remove one vertical and one horizontal lines: Fig shows the weight values of the pixels in the beginning of the iteration, all background pixels have the lowest price; Fig shows the trajectory in the vertical direction, which has the lowest cumulative cost; Fig shows the result of this iteration is the reformatting of the bitmap by removing pixels of the given trajectory. Figure 3 (3.4, 3.5 and 3.6) shows the next iteration, which is finding and removing the trajectory of pixels in the horizontal direction.

The formation of cell protonirovaniya (halftoning) of the reformatted bitmap perform at the fifth step 105. At this step, there is a possibility to take into account the color of the symbol. In the print microtext character. A movie script in the Postscript language to print microtext character through the formation of cell protonirovaniya shown in Figure 4.

The claimed method can be applied for multiple protocols and languages print. Additionally, there is the possibility to include bitmaps multiple characters in a single cell of protonirovaniya and, Vice versa, you can include only the portion of the bitmap character in one cell protonirovaniya.

Figure 5 shows the block diagram is the way the microprinting using the inventive method of forming characters for the microprinting. In step 501 extract the original size of the printed font of the current text. If the original font size is less than or equal to one typographical paragraph, he refers to the microtext (502), then perform the steps of microprinting. Condition 503 checks whether this character is saved bitmap symbol of microtext. If this symbol is treated for the first time, it forms the symbol for the microprinting: create bitmap symbol of microtext and cell protonirovaniya (step 404). Microprinting current character performed in step 505. Next, perform the subsequent processing of the current text block (step 506).

The claimed method is based on the following conversion technologies image: rasterization in a fairly large bitmap, skeletonization and specific reformatting bitmap to preserve readability.

The speed of change in real time depending on the size of the bitmap, which in turn depends on the font size and printing resolution. It is preferable to choose the font size for screening from 5 to 8 typographical points.

The method allows to add the ability to microprinting in modern custom color and black and white printers and MFP without the use of special microscripts. The character of any font can be converted microtext in real-time. It is possible to embed the proposed method in the raster image processor (RIP) or the driver of the printing device.

Although the above embodiment of the invention has been set forth to illustrate the present invention, the experts it is clear that various modifications, additions and substitutions, without departing from the scope and meaning of the present invention disclosed in the accompanying claims.

1. The method of forming characters for the microprinting, in which for each character in the image determine the appropriate size of the font, taking into account the rules of formation of small fonts, characterized in that will rasterize symbol in the bit map, skeletonizing bit card was reformatted bitmap preserving the intelligibility of the character, form cell protonirovaniya of the reformatted bitmap.

2. The method according to claim 1, characterized in that when skeletonization bitmap use a parallel refinement.

3. The method according to claim 1, characterized in that was reformatted bitmap, producing multiple reduction, thus determine the significance of the pixels, and at each stage of reduction removes at least one combined group of less significant pixels in the vertical or horizontal direction.

4. The method according to claim 3, characterized in that select group less nazimah pixels builds a graph on a regular grid on the map of values, and with its help solve the problem of finding a path on a graph, using a dynamic programming algorithm that minimizes the cumulative cost of the path.

5. The method according to claim 4, characterized in that to determine the significance of the pixels, using a cost function, in which the white background pixels have the lowest cost, end or branching pixels of the frame have high or higher value depending on the distance to each of them, the other pixels of the frame of the character image have an average cost depending on distance from the nearest end or branching pixels.

6. The method according to claim 1, characterized in that the cell protonirovaniya form of one reformatted bitmap.

7. The method according to claim 1, characterized in that the cell protonirovaniya form of several reformatted bitmap.

8. The method according to claim 1, characterized in that the cell protonirovaniya form of the fragment reformatted bitmap.



 

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