CN101404711B - Correction method of printing drawing data - Google Patents

Abstract

The invention relates to a method for correcting printed drawing data, which mainly combines the surface property of a substrate and the ink property to establish a plurality of correction programs and corrects the pixel points or the size proportion of patterns in the drawing data to be printed by an image processing method so as to achieve the consistency of the printed drawing data and the previous drawing data to be printed.

Description

Correction method for printing graphic file data

technical field

The invention relates to a data correction method, in particular to a correction method for printing image file data by establishing several pattern correction schemes for correcting the image file data to be printed. the

Background technique

Traditionally, the inkjet printing method converts the resolution of the pattern to be printed into the resolution of the printed pattern of the output device, and then adjusts the number of ink droplets ejected by the output device according to the pixel value of the pattern. the

However, due to factors such as the resolution of the output device, the size of the ink jet hole, the substrate, etc., there are errors of different sizes between the pattern printed by the output device and the pattern in the original image file data. Therefore, in order to avoid errors between the pattern printed by the output device and the pattern in the original image file data, many improvement methods have been proposed. the

For example, the image compensation system provided in U.S. Patent No. 5,483,351 is applied to two printers that print different colors. When the two printers print the same image file, there will be differences at the edges of the printed image file, so , in order to avoid the difference in the printed image files, center on the pixel to be output, use 3×3 pixels, or use 4 pixels as the center, use 4×4 pixels to judge whether to correct the pixel to be output Pixel values. the

Then, on one printer, the shrinkage-concept correction method is used, while on the other printer, the diffusion-concept correction method is used, using half-pixel value patching, that is to say, alternating black and white on all black or all white edges Output to patch the edges of the pattern. the

Furthermore, US Pat. No. 5,483,351 also provides another calculation method to correct the white defects formed at the interlaced borders of different colors when printing digital images. the

In addition, a correction method is provided in the International Cooperation Patent No. WO2004050260, which produces a mask that can print a specific pattern and is used in each printing process to eliminate the problem caused by the abnormal operation of the ink jet hole. Defects resulting from non-uniform density distribution. the

However, the aforementioned techniques provide many methods for improving the pattern edge and avoiding nozzle failure, so as to avoid errors between the pattern printed by the output device and the pattern in the original image data. However, the error between the image file data printed by the output device and the pattern in the original image file data is also related to the difference that occurs when the resolution of the pattern is converted to the resolution of the pattern printed by the output device; in addition, The surface properties of the substrate are another important consideration, as the same pattern is printed on different substrate materials, and its variability should be considered as the basis for modifying the pattern. the

Contents of the invention

The first method for correcting printed image data disclosed in the present invention is used to correct the image data to be printed, which includes the following steps: first, establish the first number of diffusion change rates related to the surface properties of the substrate corresponding to the first patterns A pattern correction program. Next, after the image file data to be printed is divided into several second patterns, each second pattern is identified to obtain the corresponding first pattern correction program. the

Afterwards, according to the obtained several first pattern correction programs, the corresponding pixel points of each second pattern are calculated, so as to execute the pixel point correction program for each second pattern, and generate several third patterns. Finally, combine each of the third patterns to generate a first print image data. the

The invention discloses a method for correcting printed image file data, the method includes the following steps:

Establish more than one set of substrate surface property information;

Obtain more than one image file data to be printed containing several pattern information;

Executing an image recognition method on the image file data to be printed, so as to generate corresponding several sub-features after classifying each pattern;

Executing several image processing means for reducing pixels corresponding to each of the substrate surface property information and each of the sub-features; and

Execute an image combining means on each of the pattern information that has been executed on each of the image processing means to form a first print image file data. the

In addition, the present invention further discloses a second method for correcting image data to be printed, which includes the following steps: firstly, several first pattern correction programs are established according to the size factor and the correction amount factor. Next, after the image file data to be printed is divided into several second patterns, each second pattern has several sizes. Next, identify each second pattern to obtain a correction program corresponding to each first pattern. the

Afterwards, according to the size of each second pattern, a corresponding number of corrections is obtained from the acquired first pattern correction program, and each corresponding second pattern is corrected with each correction amount to generate several third patterns. pattern. Finally, combine each of the third patterns to generate the first printing image data. the

The third method for correcting printed image file data disclosed by the present invention includes the following steps: firstly, establishing more than one set of substrate surface property information; obtaining more than one image file data to be printed containing pattern information; Perform image recognition means on the data to generate corresponding sub-features after classifying patterns; perform corresponding image processing means based on substrate surface property information and sub-features; and perform image combination means on the pattern information of the executed image processing means, to form the first print image file data. the

The method for correcting image data for printing disclosed in the present invention is mainly to establish several pattern correction programs in conjunction with image segmentation and image recognition methods to correct image data to be printed so as to generate image data suitable for printing to achieve printing The output graphic file data is consistent with the previous graphic file data to be printed. the

The detailed features and advantages of the present invention are described in detail below in the embodiments, the content of which is sufficient to enable any person of ordinary skill in the art to understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the claims and the appended FIG. 1 , any person of ordinary skill in the art can easily understand the related objects and advantages of the present invention. the

Description of drawings

Figure 1 is the image file data to be printed;

Fig. 2 is the flow chart of the correction method of the first kind of print image file data provided according to the present invention;

Figure 3A is a non-complete pie pattern;

Figure 3B is a complete pie pattern;

Fig. 4A is the first print graphic file data;

Fig. 4B is the completed figure of printing;

Fig. 5 is the flow chart of the correction method of the second kind of image file data provided according to the present invention;

Figure 6 is the image file data to be printed;

Fig. 7 is the second pattern produced after segmentation;

Figure 8 is the third pattern produced after correction;

Figure 9 is the printed pattern;

Fig. 10 is the flow chart of the correction method of the third kind of file data provided according to the present invention;

Fig. 11 is the flow chart of correcting the density quality of the first print picture file data; And

FIG. 12 is a flow chart of correcting the density quality of the first pattern. the

Explanation of reference signs

10 Image data to be printed

15 Incomplete pie pattern

20 Complete Pie Patterns

24 The first print pattern data

25 Print completed map

30 Image data to be printed

31, 32, 33, 34 pie pattern

35, 36, 37, 38 square pattern

39, 40, 41, 42 rectangular pattern

43, 44, 45, 46 triangle pattern

47, 48, 49, 50 pie pattern

51, 52, 53, 54 square pattern

55, 56, 57, 58 rectangular pattern

59, 60, 61, 62 triangle pattern

70 Print result graph

Detailed ways

When printing a picture file, it is necessary to convert the picture file to be printed into the picture file data 10 to be printed that can be recognized by the printing device. The data format of the picture file to be printed can be JPEG, TIFF, BMP, GERBER or CAD, etc., and the converted The resolution of the image file data 10 to be printed must be greater than the recognizable resolution of the printing device and smaller than the resolution of the original image file to be printed, and the converted image file data 10 to be printed is shown in FIG. 1 . the

Please refer to Fig. 1 and Fig. 2 for the flow chart of the first embodiment of the present invention and the first correction method provided by the present invention, so that the image file data printed by the printing device is consistent with the original image file data, therefore, use The correction method provided by the present invention is used to correct the image file data 10 to be printed in FIG. 1 . the

In FIG. 1, the pixel point data to be printed is represented by ●, which also requires the printing device to eject ink droplets, and the pixel point data not to be printed is represented by blank, which also does not require the printing device to eject ink droplets. the

However, before using the correction method provided by the present invention, a first pattern correction program (step 100 ) corresponding to the diffusion change rate of several first patterns must be established in advance, and the diffusion change rate is related to the surface property of the substrate. Wherein, the first pattern includes straight lines, horizontal lines, oblique lines, irregular patterns, circular arcs, convex circular arcs, concave circular arcs, circles, squares, rectangles, triangles, English letters, numbers or characters, etc. the

Since the pattern is composed of different edge pixels, the diffusion change rate of each pattern will also be different. Therefore, when correcting the different patterns in the image file data to be printed, it is necessary to have different diffusion change rates. The pattern correction program for correction. the

Wherein, the so-called diffusion change rate is a diffusion ratio between the generated printed pattern and the original first pattern after printing several pixels of the first pattern. This diffusion ratio is related to the surface properties of the substrate. the

For example, a straight line pattern with a line width of A is printed to illustrate the aforementioned diffusion change rate. The straight line is composed of several single rows of pixels, so when the ink drop drops into the ink drop according to each pixel point, the ink drop will show a diffusion change on the printed object, and the ink drop will also produce a part of the ink drop on the printed object. The ink droplets overlap, so the width of the straight line printed by the printing device is B, but it is not equal to the width A of the original straight line, and the diffusion ratio between the width B of the straight line and the width A of the original straight line is also the number of straight line patterns. The rate of change of diffusion between pixels. the

It is known from the above that the diffusion change rate between the pixels of each pattern has a certain relationship with the ink droplets ejected by the printing device, the surface of the printed matter, and the pixels of the pattern, so it can be changed by changing the ink droplets ejected , the surface of the material to be printed or the pixel points of the pattern, the pattern printed by the printing device can be adjusted. the

Next, modify the image file data 10 to be printed in FIG. 1 , and divide the image file data 10 to be printed (refer to FIG. 1 ) into several second patterns by an existing image segmentation method (step 110 ). The second pattern may include straight lines, horizontal lines, oblique lines, irregular patterns, circular arcs, convex circular arcs, concave circular arcs, circles, squares, rectangles, English letters, numbers or characters, and the like. the

However, in the process of dividing the image file data 10 to be printed, some second patterns will be divided into several non-original second patterns, which will lead to errors in the subsequent execution of image recognition, and then use the wrong first pattern correction program to Correct the pixels corresponding to the second pattern. For example, FIG. 3A shows an incomplete pie pattern 15 formed after image segmentation. the

Therefore, after the image file data 10 to be printed is divided, the integrity of the second pattern must be judged based on the divided position of the second pattern and the adjacent boundary of the divided position. That is to say, when the adjacent boundary of the second pattern is divided into more than or equal to three parts, the state of being divided is maintained (step 111 ), because the second pattern is a large-area pattern. the

If it is judged that the adjacent boundaries of the second pattern are less than three parts, the patterns corresponding to the adjacent boundaries of the second pattern are merged to form a complete second pattern (step 112 ). In other words, after performing step 111 and step 112 in FIG. 3A , a completed pie pattern 20 can be obtained, as shown in FIG. 3B . the

Afterwards, all the second patterns are recognized by the existing image recognition method, so as to distinguish the shape of each second pattern. After the image recognition of the second pattern is completed, the corresponding pattern correction program is obtained according to each second pattern (step 120), and several pixels of the corresponding second pattern are calculated according to the acquired first pattern correction procedure , to generate several third patterns after executing the pixel point correction procedure on each second pattern (step 130). the

The so-called pixel point correction procedure may increase or decrease several pixels of each second pattern, or may not change the pixels of the second pattern. Wherein, the pixel points of the second pattern also refer to the pixel points required to form the second pattern. In this embodiment, the number of pixels corresponding to each second pattern is reduced as an example. the

Afterwards, all the third patterns are combined to generate the first print image file data 24 (step 140), as shown in Figure 4A. the

Finally, the printing device prints as shown in FIG. 4A , and also prints with the first print image file data 24 , so as to obtain the same image file data as originally intended to be listed, as shown in FIG. 4B , which is also the printed image 25 . the

In addition, please refer to FIG. 5 and FIG. 6 for the flow chart of the second correction method provided by the present invention and its second embodiment, so as to use the second correction method provided by the present invention to process the image file data to be printed in FIG. 6 30 for corrections. the

First, before using the correction method provided by the present invention, several first pattern correction programs are established according to the size factor and the correction amount factor (step 200 ). Wherein, the size factor represents the first pattern of different sizes, and the correction amount in the correction amount factor is based on printing several pixels of the first pattern of different sizes to generate corresponding several printed patterns and the first pattern of the original size Several diffusion ratios between are obtained. Among them, the first pattern includes straight lines, horizontal lines, oblique lines, irregular patterns, circular arcs, convex circular arcs, concave circular arcs, circles, squares, rectangles, triangles, English letters, numbers or characters, etc. . the

Next, similar to the first correction method provided above, the graphic file data 30 to be printed (refer to FIG. 6 ) is divided into several second patterns by using an existing image segmentation method (step 210 ). the

Wherein, the second pattern can be a circle, a square, a rectangle, a triangle, a straight line, a horizontal line, an oblique line, an irregular pattern, an arc line, a convex arc line, a concave arc line, English letters, numbers, characters or other pattern. the

Then, the integrity of the second pattern is judged, and when the adjacent boundary of the second pattern to be divided is divided into more than or equal to three parts, the divided state is maintained (step 211 ). If it is determined that the segmented position of the second pattern and the adjacent boundary are two parts, the second pattern of the two parts is combined to form a complete second pattern (step 212 ). the

After that, all the second patterns are recognized by the existing image recognition method, so as to isolate each second pattern, as shown in FIG. 7 . In FIG. 7 there are pie patterns 31 , 32 , 33 , 34 , square patterns 35 , 36 , 37 , 38 , rectangular patterns 39 , 40 , 41 , 42 and triangular patterns 43 , 44 , 45 , 46 of different sizes. the

After the image recognition of the second pattern is completed, the corresponding first pattern correction program is obtained according to each second pattern (step 220 ). Wherein, each second pattern corresponds to a size. the

Next, according to the size of each second pattern, a corresponding number of corrections is obtained from the obtained first pattern correction program (step 230), and the corresponding second pattern is corrected with each correction amount to generate a number A third pattern (step 240), as shown in Figure 8, it includes the second pattern that has corrected different sizes, as pie pattern 47,48,49,50, square pattern 51,52,53,54, rectangular pattern 55, 56, 57, 58 and triangle patterns 59, 60, 61, 62. the

Wherein, several pixels of each second pattern may be increased or decreased according to each correction amount, or pixels of the second pattern may not be changed. Wherein, the pixel points of the second pattern also refer to the pixel points required to form the second pattern. In this embodiment, the number of pixels corresponding to each second pattern is reduced as an example. the

Afterwards, all the third patterns are combined to generate the first printing image data (step 250). Finally, the printing device prints the first printed image data to obtain a printed image 70, as shown in FIG. the

Please refer to Fig. 10 for the correction method of the third kind of print image file data provided according to the present invention, comprising the following steps: first, establish more than one group of substrate surface property information (step 300), this substrate surface property information is used for The conversion calculates the diffusion change ratio corresponding to several dot pitches in each pattern information in the image file data to be printed. Wherein, the calculation of the diffusion change ratio is based on the printing material, the surface treatment of the substrate, the surface material of the substrate or the printing height of the inkjet head. the

Next, after obtaining one or more picture file data to be printed containing several pattern information (step 310), the image recognition means is performed on the picture file data to be printed, so as to classify each pattern and generate corresponding several sub-features ( Step 320). the

Among them, the format of the image data to be printed includes JPEG, TIFF, BMP, GERBER or CAD, and the image recognition means can be the existing image segmentation method or image recognition method, and the secondary features include straight lines, horizontal lines, and oblique lines , Irregular patterns, arcs, convex arcs, concave arcs, circles, squares, rectangles, triangles, English letters, numbers or text. the

Afterwards, according to the established substrate surface property information and the sub-features of each pattern information, several corresponding image processing means are executed (step 330). This image processing means adopts the method of edge image feature extraction, and performs During correction, the pixel points of the pattern information are reduced according to the diffusion change ratio corresponding to each pattern information. the

Finally, execute the image combining means on the pattern information of the image processing means to form the first printing image file data (step 340). the

In addition, the present invention further provides a density quality adjustment program during printing. This adjustment program can be used after the first printing image generated by the aforementioned first correction method, second correction method, and third correction method, or after The density quality adjustment procedure is performed after the correction procedure of the first pattern is established in the aforementioned first correction method, second correction method and third correction method.

Please refer to the flow chart shown in Figure 11, take adjusting the density quality of the first print image file data as an example, also execute the density quality adjustment method after step 140, step 250 and step 340, this method includes the following steps: first , establish a predetermined value (step 400), the predetermined value is multiplied by the constant value and the output ink dot diameter value, and the constant value is 0.707, and the output ink dot diameter value is the diameter that the ink dot presents on the printed object. the

Then, obtain the Mi pixels to be printed in each column of the first print image data (step 410), then, decide to delete Ni pixels from the Mi pixels in the first print image data, so that the first To print the image file data, only Pi pixels are printed for each column, wherein Ni pixels are less than Mi pixels (step 420). the

Next, after confirming that the pixel distance value of each adjacent pixel point in the Pi pixel point is not greater than this predetermined value (step 430), define a fourth pattern that is identical with the first print image file data (step 440), and the second The position of the Pi pixel corresponding to the four patterns is set to one (step 450 ), and the position of the Ni pixel corresponding to the fourth pattern is set to zero (step 460 ). Finally, the fourth pattern is multiplied by the first printing profile data to generate the second printing profile data (step 470). the

Please refer to the flow chart shown in Figure 12, after (step 100) and (step 200), carry out concentration quality adjustment procedure, this method comprises the following steps: at first, establish predetermined value (step 500), and this predetermined value is constant value Multiplied with the output ink dot diameter value, and the constant value is 0.707, the output ink dot diameter value is the diameter that the ink dot presents when it is printed. the

Next, obtain the Mi pixels to be printed in each column of each first pattern (step 510), and then delete Ni pixels from the Mi pixels in each first pattern, so that each first The pattern prints only Pi pixels for each column, where Ni pixels are less than Mi pixels (step 520). the

Next, after confirming that the pixel distance value of each adjacent pixel point in each Pi pixel point is not greater than this predetermined value (step 530), each fifth pattern of the definition number is identical with several first patterns (step 540), and The Pi pixel point position of the first pattern corresponding to each fifth pattern is set to one (step 550), and the Ni pixel point position of the first pattern corresponding to each fifth pattern is set to zero (step 560) . Finally, each fourth pattern is multiplied by the corresponding first pattern to regenerate each first pattern (step 570). the

Among them, i=1...n among the pixels of Mi, Pi and Ni in Fig. 11 and Fig. 12 represent the first print image file data or the pixels of the first column of the first pattern, and i=n represents The first print image file data or the pixel points of the last row of the first pattern, and if expressed in a mathematical formula in step 430 and step 530 can be:

$\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; TR</span>}<span\; class="notranslate">\; \&le;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}\mathrm{<span\; class="notranslate">\; D.</span>}$

Among them, P represents the number of points between every two adjacent pixels that need to be printed in each column of the first printed image file data or the first pattern, and TR represents the resolution of the first printed image file data or the first pattern Corresponding to the pixel width, D is expressed as the droplet diameter. the

The method for correcting image data for printing provided by the present invention is mainly to establish several pattern correction programs in conjunction with image segmentation and image recognition methods to correct image data to be printed so as to generate image data suitable for printing to achieve printout The image data of the image is consistent with the previous image data to be printed. the

Although the present invention is disclosed above with the foregoing embodiments, they are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes and modifications made belong to the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended claims.

Claims (10)

1. A correction method for printing graphic file data, characterized in that the method comprises the following steps: Establish more than one set of substrate surface property information; Obtain more than one graphic file data to be printed containing several graphic information; Executing an image recognition means on the image file data to be printed, so as to generate corresponding several sub-features after classifying each pattern; Execute a plurality of image processing means for reducing pixels corresponding to each of the sub-features according to the surface property information of each of the substrates; and Execute an image combining means on each of the pattern information that has been executed on each of the image processing means to form a first print image file data. 2. The method for correcting printed image data according to claim 1, wherein each of the substrate property information is used to convert and calculate a number of dot pitches in each of the pattern information in the image data to be printed corresponding to a diffusion change ratio. 3. The method for correcting printed image data according to claim 2, wherein the calculation of the diffusion change ratio is based on a printing material, a substrate surface treatment, a substrate surface material or an inkjet head printing height. 4. The method for correcting printed graphic file data according to claim 1, wherein the image processing means adopts an edge image feature extraction method. 5. The method for correcting printed graphic file data according to claim 1, wherein the sub-features include a straight line, a horizontal line, an oblique line, an irregular pattern, an arc line, and a convex arc A line, a concave arc, a circle, a square, a rectangle, a triangle, an English letter, a number or a character. 6 . The method for correcting printed graphic data according to claim 1 , wherein the format of the graphic data to be printed includes a JPEG, a TIFF, a BMP, a GERBER or a CAD. 7. The method for correcting printed graphic file data according to claim 1, wherein each of the image processing means reduces the number of pixels of each of the pattern information according to the number of diffusion change ratios corresponding to each of the pattern information . 8. The method for correcting the printed graphic file data according to claim 1, characterized in that, after the step of generating the first printed graphic file data, the following steps are included: establish a predetermined value; Obtain Mi pixels to be printed in each column of the first print image file data; Delete Ni pixels from Mi pixels, so that the first print image file data only prints Pi pixels for each column, wherein Ni pixels are less than Mi pixels; Confirm that the one-pixel distance value of each adjacent pixel point in the Pi pixel point is not greater than the predetermined value; defining a fourth pattern equal to the first print image data; The position corresponding to the Pi pixel point in the fourth pattern is set as one; Setting the position corresponding to the Ni pixel in the fourth pattern to zero; and The fourth pattern is multiplied by the first printing image data to generate the second printing image data. 9. The method for correcting the printed image data according to claim 8, wherein the predetermined value is multiplied by a constant value and an output ink dot diameter value. 10. The method for correcting printed graphic file data according to claim 9, wherein the constant value is 0.707.

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