CN107644412B - Printing effect judgment method and device - Google Patents
Printing effect judgment method and device Download PDFInfo
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- CN107644412B CN107644412B CN201710668952.4A CN201710668952A CN107644412B CN 107644412 B CN107644412 B CN 107644412B CN 201710668952 A CN201710668952 A CN 201710668952A CN 107644412 B CN107644412 B CN 107644412B
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Abstract
The invention discloses a method for judging printing effect, which comprises the following steps: s1, acquiring the maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to the maximum non-blank rectangular area; s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture; s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture; s4, acquiring the maximum rectangular effective area of the photographed picture; s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture; s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture; s7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed photographed picture; a print effect judging apparatus is also disclosed. The method has high accuracy and reliability in judging the printing effect and low error rate.
Description
Technical Field
The invention relates to the field of printing, in particular to a method and a device for judging printing effect.
Background
Good printing effect is an important guarantee for product quality guarantee in the printer industry. At present, the printing effect of a printer is observed by naked eyes, and the shade and the definition of the printing effect are subjectively judged; the same picture or different pictures are printed, so that the judgment results of different people are greatly different, and the error rate is high.
Disclosure of Invention
In order to solve the above-mentioned problems, an object of the present invention is to provide a method and an apparatus for determining a print effect with a low error rate and high reliability.
The technical scheme adopted by the invention is as follows: a print effect judging method includes the following steps:
s1, acquiring a maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture in size;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
Further, the step S7 includes the following steps:
s71, obtaining the gray value difference of pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
s72, obtaining an average value and a discrete degree value of the gray value difference according to all the gray value differences, wherein the average value of the gray value difference represents the gray level of the printed picture relative to the original picture, and the larger the average value of the gray value difference is, the thicker the average value is; conversely, the lighter the color; the discrete degree value of the gray value difference represents the definition of the printed picture relative to the original picture; the larger the discrete degree value of the gray value difference is, the more fuzzy the gray value difference is; the more clear the reverse.
Further, the average value of the gray value differences ranges from-255 to 255.
Further, the dispersion degree value is a range, an average difference or a standard deviation.
Further, the value of the degree of dispersion is 0 or more.
Further, the method for acquiring the maximum rectangular effective area comprises the following steps:
graying the picture;
acquiring the gray value of each pixel point of the grayed picture;
and acquiring a maximum rectangular area with the gray value larger than zero in the grayed picture, wherein the maximum rectangular area is the maximum rectangular effective area of the picture.
Further, the method for graying the picture is a component method, a maximum value method, an average value method or a weighted average method.
The other technical scheme adopted by the invention is as follows: a print effect judging device includes
The first maximum rectangular effective area acquisition unit is used for acquiring a maximum rectangular effective area of an original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
the first gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
the photographing picture acquiring unit is used for printing the original picture to obtain a printed picture and photographing the printed picture to acquire a photographing picture;
a second maximum rectangular effective region acquisition unit, configured to acquire a maximum rectangular effective region of the photographed picture;
the zooming unit is used for zooming the maximum rectangular effective area of the photographed picture to enable the maximum rectangular effective area of the photographed picture to be the same as the maximum rectangular effective area of the original picture in size;
the second gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed photographed picture;
and the judging unit is used for judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
Further, the judging unit includes:
the gray value difference obtaining module is used for obtaining the gray value difference of the pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
the calculation and judgment module is used for acquiring the average value and the discrete degree value of the gray value difference according to all the gray value differences, the average value of the gray value difference represents the gray level of the printed picture relative to the original picture, and the larger the average value of the gray value difference is, the thicker the average value is; conversely, the lighter the color; the discrete degree value of the gray value difference represents the definition of the printed picture relative to the original picture; the larger the discrete degree value of the gray value difference is, the more fuzzy the gray value difference is; the more clear the reverse.
The other technical scheme adopted by the invention is as follows: a print effect judging device includes
A memory for storing a program;
a processor executing the program for performing the steps of:
s1, acquiring a maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture in size;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
The invention has the beneficial effects that:
according to the method and the device, the original picture is photographed to obtain the photographed picture, the printing effect is judged according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed photographed picture, the printing effect judgment accuracy and the reliability are high, and the error rate is low.
In addition, the average value and the discrete degree value of the gray value difference of the pixel points at the same position of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture are obtained to judge the printing effect, the printing effect is digitally quantized, and the simple and quick judgment of the printing effect is realized.
Drawings
The following further describes embodiments of the present invention with reference to the accompanying drawings:
FIG. 1 is a flowchart of a method of determining print effect according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
A print effect judging device includes
The first maximum rectangular effective area acquisition unit is used for acquiring a maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
the first gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
the photographic image acquisition unit is used for printing the original image to obtain a printed image and shooting the printed image to acquire a photographic image;
the second maximum rectangular effective area acquisition unit is used for acquiring the maximum rectangular effective area of the photographed picture;
the zooming unit is used for zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture have the same size as the maximum rectangular effective area of the original picture;
the second gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and the judging unit is used for judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
Further, the judging unit includes:
the gray value difference acquisition module is used for acquiring the gray value difference of the pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
the calculation and judgment module is used for acquiring the average value and the discrete degree value of the gray value difference according to all the gray value differences, the average value of the gray value difference represents the gradation of the printed picture relative to the original picture, and the larger the average value of the gray value difference is, the thicker the average value is; conversely, the lighter the color; representing the definition of the printed picture relative to the original picture by the discrete degree value of the gray value difference; the larger the discrete degree value of the gray value difference is, the more fuzzy the gray value difference is; the more clear the reverse.
A print effect judging device includes
A memory for storing a program;
a processor executing a program for performing the steps of:
s1, acquiring the maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to the maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
Based on the above print effect determination apparatus, the present invention further provides a print effect determination method, including the following steps:
s1, acquiring the maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to the maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
According to the method and the device, the original picture is photographed to obtain the photographed picture, the printing effect is judged according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed photographed picture, the printing effect judgment accuracy and the reliability are high, and the error rate is low.
As a further improvement of the technical solution, the method for acquiring the maximum rectangular effective area comprises:
graying the picture; furthermore, the method for graying the picture is a component method, a maximum value method, an average value method or a weighted average method;
acquiring the gray value of each pixel point of the grayed picture;
and acquiring a maximum rectangular area with the gray value larger than zero in the grayed picture, wherein the maximum rectangular area is the maximum rectangular effective area of the picture, namely the maximum non-blank rectangular area.
Referring to fig. 1, fig. 1 is a flowchart of a method according to an embodiment of a method for determining print effect in the present invention; during actual judgment, converting the original image into an 8-bit gray image, and calculating the gray value of each pixel point in the original image; judging whether the gray value of the pixel point is larger than zero or not according to the gray value of the pixel point, and acquiring the maximum rectangular area of the original picture; then, obtaining the gray value of each pixel point in the maximum rectangular area of the original picture; printing an original picture to obtain a printed picture, shooting the printed picture, and performing the same operation on the printed picture as the original picture to obtain the maximum rectangular area of the shot picture; then, the maximum rectangular area of the photographed picture is zoomed to be the same as the maximum rectangular area of the original picture; and acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture. And finally, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
As a further improvement of the technical solution, referring to fig. 1, step S7 includes the following steps:
s71, obtaining the gray value difference of pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
s72, obtaining the average value and the discrete degree value of the gray value difference according to the gray value difference of all the positions, wherein the average value of the gray value difference represents the gradation of the printed picture relative to the original picture, and the range of the average value of the gray value difference is-255 to 255; the larger the average value of the gray value difference is, the thicker the average value is, and the better the printing effect is; the opposite is the lighter. The worse the printing effect; representing the definition of the printed picture relative to the original picture by the discrete degree value of the gray value difference; further, the dispersion degree value is range, average difference or standard deviation; the value of the degree of dispersion is greater than or equal to 0; the larger the discrete degree value of the gray value difference is, the more fuzzy the printing effect is, the poorer the printing effect is; on the contrary, the clearer the printing effect is.
According to the invention, through digital quantization of the printing effect, the judgment of the printing effect has a uniform standard, namely the density of the printed effect relative to the original image, namely the average value of the gray value difference, ranges from-255 to 255, and the smaller the printing effect is, the lighter the printing effect is relative to the original image, the larger the printing effect is, the thicker the printing effect is relative to the original image; the printed effect is relative to the definition of the original image, namely the discrete degree value, the discrete degree value is more than or equal to 0, and the smaller the discrete degree value is, the clearer the discrete degree value is relative to the original image, and the larger the discrete degree value is, the more fuzzy the discrete degree value is relative to the original image. The digital quantized measured value of the printing effect has extremely high accuracy and reliability.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A print effect judging method is characterized by comprising the following steps:
s1, acquiring a maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture in size;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
2. A print effect judging method according to claim 1, wherein said step S7 includes the steps of:
s71, obtaining the gray value difference of pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
s72, obtaining an average value and a discrete degree value of the gray value difference according to all the gray value differences, wherein the average value of the gray value difference represents the gray level of the printed picture relative to the original picture, and the larger the average value of the gray value difference is, the thicker the average value is; conversely, the lighter the color; the discrete degree value of the gray value difference represents the definition of the printed picture relative to the original picture; the larger the discrete degree value of the gray value difference is, the more fuzzy the gray value difference is; the more clear the reverse.
3. A print effect judging method according to claim 2, wherein the average value of the gradation value differences is in a range of-255 to 255.
4. The print effect judging method according to claim 2, wherein the dispersion degree value is a range, an average difference or a standard deviation.
5. The print effect judging method according to claim 4, wherein the value of the degree of dispersion is 0 or more.
6. A print effect judging method according to any one of claims 1 to 5, wherein the maximum rectangular effective area is obtained by:
graying the picture;
acquiring the gray value of each pixel point of the grayed picture;
and acquiring a maximum rectangular area with the gray value larger than zero in the grayed picture, wherein the maximum rectangular area is the maximum rectangular effective area of the picture.
7. The method of claim 6, wherein the graying of the picture is performed by a component method, a maximum method, an average method or a weighted average method.
8. A print effect judging device is characterized by comprising
The first maximum rectangular effective area acquisition unit is used for acquiring a maximum rectangular effective area of an original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
the first gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
the photographing picture acquiring unit is used for printing the original picture to obtain a printed picture and photographing the printed picture to acquire a photographing picture;
a second maximum rectangular effective region acquisition unit, configured to acquire a maximum rectangular effective region of the photographed picture;
the zooming unit is used for zooming the maximum rectangular effective area of the photographed picture to enable the maximum rectangular effective area of the photographed picture to be the same as the maximum rectangular effective area of the original picture in size;
the second gray value acquisition unit is used for acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed photographed picture;
and the judging unit is used for judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
9. The print effect judging apparatus according to claim 8, wherein the judging unit includes:
the gray value difference obtaining module is used for obtaining the gray value difference of the pixel points at the same position according to the gray values of the pixel points at the same position in the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture;
the calculation and judgment module is used for acquiring the average value and the discrete degree value of the gray value difference according to all the gray value differences, the average value of the gray value difference represents the gray level of the printed picture relative to the original picture, and the larger the average value of the gray value difference is, the thicker the average value is; conversely, the lighter the color; the discrete degree value of the gray value difference represents the definition of the printed picture relative to the original picture; the larger the discrete degree value of the gray value difference is, the more fuzzy the gray value difference is; the more clear the reverse.
10. A print effect judging device is characterized by comprising
A memory for storing a program;
a processor executing the program for performing the steps of:
s1, acquiring a maximum rectangular effective area of the original picture, wherein the maximum rectangular effective area refers to a maximum non-blank rectangular area;
s2, acquiring the gray value of each pixel point in the maximum rectangular effective area of the original picture;
s3, printing the original picture to obtain a printed picture and shooting the printed picture to obtain a shot picture;
s4, acquiring the maximum rectangular effective area of the photographed picture;
s5, zooming the maximum rectangular effective area of the photographed picture to make the maximum rectangular effective area of the photographed picture the same as the maximum rectangular effective area of the original picture in size;
s6, acquiring the gray value of each pixel point in the maximum rectangular effective area of the zoomed picture;
and S7, judging the printing effect according to the gray values of the pixel points at the same positions of the maximum rectangular effective area of the original picture and the maximum rectangular effective area of the zoomed picture.
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| CN201710668952.4A CN107644412B (en) | 2017-08-08 | 2017-08-08 | Printing effect judgment method and device |
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| CN108628557A (en) * | 2018-04-19 | 2018-10-09 | 深圳鼎智通讯股份有限公司 | A kind of efficient printer technology based on picture compression |
| CN110861418B (en) * | 2019-11-14 | 2021-09-07 | 艾体威尔电子技术(北京)有限公司 | Method for printing color photo under single gray scale condition |
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