JP5002942B2 - Gravure plate cell shape measuring apparatus and measuring method - Google Patents

Description

  The present invention belongs to the technical field of gravure printing and gravure coating. In particular, the present invention relates to an apparatus and method for measuring a cell shape formed on a gravure plate.

  The cells formed on the gravure plate have a role of storing ink to be transferred to a substrate such as paper or film. In order to obtain a desired transfer amount of the ink, it is important to manage the cell shape. As a cell shape management method, cell depth, cell width (maximum width), cell length (maximum length), cell area, cell volume, etc., which are cell shape parameters, are measured and managed based on the measured values. Is called. If the formation method and type of the cell are specified, the cell shape as a three-dimensional shape can be almost estimated from these parameters. The cell forming method is, for example, an engraving method, and the type is, for example, compressed, elon gate, coarse, fine, or custom dot. Taking into account the cell formation method and type, the parameters represent the cell shape itself.

Therefore, there is a proposal for a cell shape measuring method and apparatus for measuring such parameters. For example, there is an invention in which the volume (or opening area) of a cell engraved on a gravure plate is measured and compared with a target cell volume (or opening area) (Patent Documents 1, 2, and 3). In addition, there is an invention for measuring the volume (or opening area) of a cell having a channel connecting cells adjacent to each other in the printing direction (Patent Document 4). In addition, there is an invention that measures the volume (or open area) of a cell semi-automatically when a measurer supports and inputs the edge of a cell when the boundary (bank) between adjacent cells is interrupted (patent) Reference 5)
JP-A-10-138440 JP-A-11-115143 JP-A-11-188831 JP 2000-65550 A JP 2000-267341 A

  The cell shape of the 100% mesh portion having the largest cell size in the gravure plate affects the maximum density in the printed matter. Therefore, when inspecting whether or not the state of the gravure plate is appropriate, it is necessary to inspect the portion having the maximum density particularly strictly. However, in cells near 100% of the mesh, in order to increase the amount of ink transfer, there may be a channel for intentionally connecting cells arranged in the printing direction (FIG. 5A). )reference). In addition, the bank that originally should separate the cells may be partially cut due to engraving variations (errors) in the engraving machine, and the cells may be connected (FIG. 5). (See (B)).

  As described above, when adjacent cells are connected, there is a connection by an appropriate intended channel, that is, an appropriate connection, and a connection by cutting a bank due to a malfunction of the engraving machine, that is, an incorrect connection. Therefore, it is necessary to automatically determine whether the connection is appropriate or incorrect when measuring the cell shape near 100% of the net for the purpose of checking whether the state of the gravure plate is appropriate or not. There is. However, in the past, such determination could not be performed automatically, and the measurer had to input instructions for the cut part of the bank one by one. Therefore, there is a problem that the measurement requires a lot of time. In addition, when measuring the cell shape of a large number of cells in order to evaluate the variation of the cells, it takes a very long time, so that the gravure plate inspection work is one of the major production impediments. There's a problem.

  The present invention has been made to solve the above problems. The purpose is that when adjacent cells are connected in the image of the gravure plate, the connection by the proper intended channel, that is, the proper connection, and the connection by cutting the bank due to a malfunction of the engraving machine, that is, the incorrect connection It is an object of the present invention to provide a gravure plate cell shape measuring apparatus and a measuring method capable of automatically discriminating the above.

According to a first aspect of the present invention, there is provided a gravure plate cell shape measuring apparatus, an imaging unit that captures a plurality of cells formed on a surface of a gravure plate and obtains a captured image, and a direction orthogonal to a printing direction in the captured image. The width in the direction orthogonal to the printing direction of the cells in a plurality of arrays when the cell is 100% formed by being separated by a bank and connected to each other in the printing direction is detected along the printing direction. As a portion having the smallest width, connection portion detecting means for detecting a connection portion in the cell and the printing direction of the cell, and an opening for calculating an opening area of the cell extracted with the bank and the detected connection portion as a boundary and area calculation unit, the opening area described above operations, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, a bank removal area detecting means for detecting a bank out portion, front A display means for displaying the presence of the bank break when a bank break is detected, and a parameter extraction means for extracting a parameter representing a cell shape for the cell when the bank break is not detected It is.
A gravure plate cell shape measuring method according to claim 2 of the present invention is a method of imaging a plurality of cells formed on the surface of a gravure plate to obtain a captured image, and the captured image is orthogonal to the printing direction. The width in the direction perpendicular to the printing direction of a plurality of cells formed of 100% mesh formed by separating the banks in the direction and connecting the cells in the printing direction is detected along the printing direction. As a portion having the smallest width , a connection part detection process for detecting a connection part in the cell and the cell printing direction , and an opening area of the cell extracted with the bank and the detected connection part as a boundary are calculated. and the opening area calculation process, the opening area described above operations, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, a bank out portion detection step of detecting a bank removal area A display step of displaying the existence of the bank removal area when said bank breakage portion is detected, when the bank removal area is not detected and to have a parameter extraction step of extracting parameters representing cell shape for the cell Is.

According to the gravure plate cell shape measuring apparatus according to claim 1 of the present invention, a plurality of cells formed on the surface of the gravure plate are picked up by the image pickup means to obtain a picked-up image. The width in the direction perpendicular to the printing direction of the cells in a plurality of arrays when the network is 100% formed by separating the banks in the direction perpendicular to the printing direction and connecting the cells in the printing direction As the part whose width is the smallest, the connection part in the cell printing direction is detected, and the opening of the cell extracted by the opening area calculation means using the bank and the detected connection part as the boundary area is calculated, the opening area computed by the bank removal area detecting means, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, bank removal area is inspected It is, when the bank breakage portion is detected is displayed the presence of the bank removal area by the display means, when the bank removal area is not detected parameter representing the cell shape for the cell by the parameter extraction unit is extracted. Therefore, when adjacent cells are connected in the captured image of the gravure plate, a connection by an appropriate intended channel, that is, an appropriate connection, and a connection by cutting a bank due to a malfunction of the engraving machine or the like, that is, an incorrect connection. There is provided a gravure plate cell shape measuring apparatus capable of automatically discriminating.
According to the gravure plate cell shape measuring method according to claim 2 of the present invention, a plurality of cells formed on the surface of the gravure plate are imaged by the imaging process to obtain a captured image, and the captured image is acquired by the connection detection process. , The width in the direction orthogonal to the printing direction of a plurality of cells in a 100% mesh formed by separating the banks in the direction orthogonal to the printing direction and connecting the cells in the printing direction As the part whose width is the smallest, the connection part in the cell and cell printing direction is detected, and the cell extracted from the bank and the connection part detected in the opening area calculation process as the boundary opening area is calculated, the opening area computed by the bank removal area detection process, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, bank removal area It is detected, when the bank breakage portion is detected is displayed the presence of the bank removal area by the display process, when the bank removal area is not detected parameter representing the cell shape for the cell by the parameter extraction process is extracted. Therefore, when adjacent cells are connected in the captured image of the gravure plate, a connection by an appropriate intended channel, that is, an appropriate connection, and a connection by cutting a bank due to a malfunction of the engraving machine or the like, that is, an incorrect connection. A gravure cell shape measuring method that can be automatically discriminated is provided.

  Next, embodiments of the present invention will be described with reference to the drawings. An example of the configuration of the cell shape measuring apparatus of the present invention is shown in FIGS. 1 and 2, 1 is a microscope, 2 is a camera, 3 is a light source, 31 is a light intensity adjusting unit, 32 is an optical fiber, 4 is a personal computer, 401 is an image input / output unit, 402 is a cell volume measuring unit, and 403 is An image processing program, 41 is a keyboard, 42 is a mouse, 43 is a display, 44 is an A / D converter, 5 is a moving device, 6 is an elevating stage, 7 is a plate cylinder turntable, and 8 is a gravure plate.

  The microscope 1 is an imaging optical system for enlarging the cell formed on the plate surface of the gravure plate 8 with the camera 2. The microscope 1 is fixedly supported on a moving table 51 in the moving device 5. The microscope 1 may be a support structure that can be removed from the movable table 51, and the microscope 1 may be used in a portable manner. The microscope 1 includes a focus adjustment unit 11 that moves the lens barrel portion in the optical axis direction for focusing. The distance from the plate surface of the gravure plate 8 to the lens barrel portion can be adjusted by movement in the optical axis direction.

  An objective lens and a relay lens are arranged in the lens barrel portion of the microscope 1. The total magnification when the objective lens and the relay lens are used can be obtained by a calculation formula: (total magnification) = (magnification of objective lens) × (magnification of relay lens). In general, convex lenses are used for both the objective lens and the relay lens, and the configuration can also be applied in the present invention. However, the preferred configuration of the imaging optical system in the present invention uses a convex lens for the objective lens and a concave lens for the relay lens. That is, the magnification of the objective lens is higher than the desired magnification, and the magnification of the relay lens is configured to be 1 or less. By applying the imaging optical system having this configuration, high resolution can be obtained. Generally, the numerical aperture (NA) increases as the magnification of the objective lens increases, and the higher the numerical aperture (NA), the higher the resolution can be obtained.

  The camera 2 includes an image sensor such as a charge coupled device (CCD) and a metal oxide semiconductor (MOS), a driving circuit thereof, and the like, and converts a light image formed on the image sensor into an electric signal and outputs the electric signal. Here, the relay lens can also be called an imaging lens or an eyepiece in the sense that an optical image is formed on an image sensor. The camera 2 is connected to the personal computer 4, and the operation of the camera 2 related to imaging is performed by the personal computer 4. Also, the captured image of the camera 2 is read by the personal computer 4.

  The light source 3 is a light source for illuminating the imaging region of the camera 2 on the plate surface of the gravure plate 8. As the light source, a halogen lamp, a metal halide lamp, an LED (light emitting diode), or the like is used. Light rays emitted from the light source 3 are collected at one end of the optical fiber 32 and guided to the microscope 1 through the optical fiber 32. In general, the imaging region is illuminated as coaxial epi-illumination. The light intensity of the normal light source 3 changes with time immediately after power is supplied and after a certain time has elapsed. Moreover, even if it uses and applies a fixed voltage, a luminous intensity changes with long-term use. Therefore, the light source 3 includes a light intensity adjusting unit 31 for adjusting the light intensity.

  The light intensity adjusting unit 31 adjusts the light intensity of the light source 3 so that a predetermined pixel in a captured image of the reference plate by the camera 2 has a predetermined pixel value. The light intensity is adjusted by adjusting the power supplied to the light source 3. The light intensity adjustment unit 31 is connected to the personal computer 4, and the light intensity adjustment unit 31 is operated by the personal computer 4 when the light intensity adjustment unit 31 adjusts the light intensity.

The personal computer 4 takes a captured image of the camera 2 and performs image processing to calculate a cell shape. Therefore, the personal computer 4 includes an image input / output unit 401, a cell volume measuring unit, an image processing program, and the like. The personal computer 4 includes a keyboard 41, a mouse 42, a display 43, an A / D converter (analog-to-digital converter).
) 44 is attached.

  An imaging signal (analog signal) output from the camera 2 is converted into a digital signal by an A / D converter (analog-to-digital converter) 44. The image input / output means 401 of the personal computer 4 inputs the digital signal and stores it in the image memory of the personal computer 4 as a captured image. The image input / output unit 401 stores the input captured image or the captured image stored in the image memory in a video memory (video memory) for display on the display 43.

The cell volume measuring means 402 of the personal computer 4 performs a process of calculating the cell volume from the cell area, cell width, etc. in the captured image. Regarding processing for calculating cell shape parameters (cell depth, cell width (maximum width), cell length (maximum length), cell area, cell volume, etc.) from the captured image, Patent Document 3 (Japanese Patent Laid-Open No. 11-188831) , Patent Document 4 (Japanese Patent Application Laid-Open No. 2000-65550), etc., and therefore detailed description thereof is omitted here.
The image processing program 403 of the personal computer 4 performs image processing on the captured image (details will be described later). For example, a correction image is obtained by performing corrections such as shading correction in the captured image and correction that makes it easy to distinguish the bank and the cell. Moreover, the process which detects the connection part of an adjacent cell is performed. In addition, a process for extracting a cell area and deriving a cell area is performed. In addition, a process for detecting whether the connection portion is an appropriate connection portion (channel) or an inappropriate connection portion (bank cut) is performed. Further, a process for extracting a parameter representing the cell shape for an appropriate cell is performed.

  The moving device 5 is a device that linearly moves the microscope 1. As shown in FIG. 1, the moving device 5 is arranged such that the direction of the linear movement coincides with the axial direction of the gravure plate. Therefore, the microscope 1 can be stopped at an arbitrary position in the axial direction of the gravure plate 8, and imaging of the surface of the gravure plate 8 at that position can be performed by the camera 2.

  The elevating stage 6 is a moving device 5, that is, a device that moves the microscope 1 in the vertical direction. As shown in FIG. 1, the upward direction is a direction away from the surface of the gravure plate 8, and the standby position of the microscope 1 in the cell shape measuring apparatus exists in that direction. Further, the downward direction is a direction approaching the surface of the gravure plate 8, and the measurement position of the microscope 1 in the cell shape measuring apparatus exists in that direction.

The plate cylinder rotating table 7 is a table on which the gravure plate 8 is mounted for measurement and the mounted gravure plate 8 is rotated. By rotating the gravure plate 8, an arbitrary position in the circumferential direction of the gravure plate 8 can be stopped just below the microscope 1. Then, the camera 2 can image the surface of the gravure plate 8 at that position. The moving device 5 and the plate cylinder turntable 7 described above can image an arbitrary position on the plate surface of the gravure plate 8.
Although the plate cylinder turntable 7 is used for measurement here, it may be a unit for placing a gravure plate to be engraved in a gravure engraving apparatus.

The configuration has been described above. Next, the operation of the cell shape measuring apparatus of the present invention will be described with reference to FIG.
First, in step S1 (microscope installation) in FIG. 3, the operator operates the lift stage 6 to move the microscope 1 in the cell shape measuring apparatus from the standby position to the measurement position. By moving to the measurement position, imaging by the camera 2 in the cell shape measuring apparatus is performed. The imaging signal output from the camera 2 is converted into a digital signal by the A / D converter 44. The digital signal is input by the image input means 401 of the personal computer 4 and stored as a captured image in the video memory. The captured image is displayed on the display 43. On the display 43, an operation screen for operating the cell shape measuring apparatus is displayed together with an imaging screen.

Imaging by the camera 2 is repeated at predetermined time intervals, and the displayed captured image is updated accordingly. The operator operates the moving device 5 and the plate cylinder turntable 7 while confirming with the captured image displayed on the display 43, so that the portion where the test engraving on the plate surface of the gravure plate 8 is directly below the microscope. 1 positioning is performed. At this time, a plurality of engraving cells are present on the same screen in the captured image. Therefore, the microscope 1 has an appropriate magnification (desired magnification).
The light intensity adjustment in the light intensity adjustment unit 31 of the light source 3 is completed in advance. A correction coefficient for performing shading correction is stored in advance in a correction coefficient memory.

Next, in step S2 (focusing), the operator adjusts the focus by adjusting the focus adjustment unit 11 of the microscope 1 while confirming with the captured image displayed on the display 43, and performs focusing on the captured image. .
Next, in step S <b> 3 (image input), the operator operates the keyboard 41, mouse 42, and the like, and inputs an instruction so that the personal computer 4 performs shape measurement on the operation screen of the display 43. Upon receiving this instruction input, the image input / output means 401 of the personal computer 4 stores the image captured by the camera 2 in the image memory of the personal computer 4.

Next, in step S4 (image preprocessing), the image processing program 403 of the personal computer 4 performs shading correction on the captured image stored in the image memory, and stores the captured image that has been subjected to the shading correction in the image memory. . In addition, a scratch on the printing plate is blurred by applying a median filter to a captured image that has been subjected to shading correction. By this processing, a corrected image obtained by performing shading correction processing and plate surface blurring processing can be obtained.
Next, in step S5 (image binarization), the image processing program 403 binarizes the corrected image to obtain a binarized image. When a discriminant analysis method in multivariate analysis is applied as a method for determining a binarization threshold, a suitable binarized image can be obtained. Depending on the nature of the gravure plate, part of the reflected light becomes a noise component and there are isolated points, isolated holes, etc., but in this binarized image, the pixel values (the bank portion and the cell portion are different) 0 or 1).

  Next, in step S6 (cell outline extraction), the image processing program 403 performs a morphology process on the binarized image to remove isolated points and isolated holes. The morphology processing is configured by processing including basic operations such as dilation, erosion, opening, closing, and the like, and the expansion / contraction processing is an example. Noise components such as isolated points and isolated holes in the binarized image are corrected by this morphology processing, and the bank portion and the cell portion in the gravure can be properly separated. That is, a contour image is obtained as an image capable of measuring the cell shape with sufficient accuracy.

  Next, in step S7 (determination 1), the image processing program 403 performs processing for determining the presence or absence of a channel. The presence or absence of a channel is determined by the following process. First, a process for detecting the cell width in the contour image is sequentially performed while proceeding in the engraving direction (printing direction) to detect a portion where the cell width is minimum. Next, it is detected whether the cell is open or closed in that portion, that is, whether or not there is a channel (a groove extending the cell). If the minimum cell width is not zero, there is a channel. The presence or absence of a channel is determined by these two processes. When it is determined that there is a channel, the process proceeds to step S8, and when it is determined that there is no channel, the process proceeds to step S12. Note that FIG. 4A illustrates an example of a cell having a channel.

Next, in step S8 (channel division processing), the image processing program 403 performs processing for dividing the channel with the channel portion, that is, the portion having the smallest cell width as a boundary. By this division, in the processing target image (captured image, binarized image, contour image, etc.), the cell has a closed region surrounded by the contour, that is, an independent region. Since there are a plurality of cells in the captured image, a plurality of cells having independent regions are generated in the processing target image by this division. Each cell is assigned a code for identifying the cell, and the cell to be processed can be distinguished from other cells. Note that FIG. 4B illustrates an example of a plurality of cells having independent regions.
Next, in step S9 (deletion of cells related to the four sides of the image), the image processing program 403 deletes cells related to the four sides forming the outer periphery of the processing target image among the plurality of cells. Further, the image processing program 403 selects one of the cells that has not been deleted and sets it as a measurement target cell.

  Next, in step S10 (reference cell size file), the image processing program 403 refers to the reference cell size file and inputs the opening area (cell area) of the reference cell corresponding to the measurement target cell. The reference cell size file describes the relationship between the conditions for forming a cell and the parameters of the cell shape. The conditions for forming the cell are the shape of the engraving needle used to form the cell (for example, the angle of the needle), the type of cell to be engraved by the engraving needle (for example, compressed, elon gate), halftone dot%, etc. That is. The cell shape parameters are cell depth, cell width (maximum width), cell length (maximum length), cell area, cell volume, and the like. Therefore, by referring to the standard cell size file based on the conditions when the measurement target cell is formed on the gravure plate, the standard cell opening area (cell area) can be obtained.

  Next, in step S11 (determination 2), the image processing program 403 performs a process of determining whether or not the opening area size of the measurement target cell matches the reference opening area size. The image processing program 403 calculates the opening area size of the measurement target cell by counting the number of pixels existing inside the independent region. Then, the opening area size to be measured is compared with the reference opening area size input in step S10. And when the difference is contained in the predetermined range, it determines with matching. On the other hand, when the difference is outside the predetermined range, it is determined that they do not match. When it is determined that they match, the process proceeds to step S12, and when it is determined that they do not match, the process proceeds to step S13.

  Next, in step S12 (cell shape measurement), the image processing program 403 measures the cell shape. For example, the cell depth, cell width (maximum width), cell length (maximum length), cell area, cell volume, and the like, which are parameters of the cell shape, are measured based on the above-described binarized image that leaves only the independent region. The cell depth and cell volume are three-dimensional shapes, so it is not possible in principle to measure from only a two-dimensional image. The shape can be calculated. The cells for which the cell shape measurement has been completed are deleted from the processing target. After deletion, the cell is not measured. Then, the process proceeds to step S16.

Next, in step S13 (determination 3), the image processing program 403 determines the size of the opening area size of the measurement target cell and the reference opening area size. When the opening area size of the measurement target cell is larger than the reference opening area size outside the predetermined range, the process proceeds to step S14. In step S14 (bank break display), the image processing program 403 displays on the display 4 that there is a bank break. Then, the process proceeds to step S16.
On the other hand, when the opening area size of the measurement target cell is smaller than the reference opening area size outside the predetermined range, the process proceeds to step S15. In step 15 (image deletion), the image processing program 403 deletes the measurement target cell from the measurement target. FIG. 4C is a diagram illustrating an example of a portion (indicated by a circle) determined to be a bank break and cells (6 cells at the center right) that are finally measured.

  Next, in step S16 (measurement of cell shape without bank break), when performing cell shape measurement on an unmeasured cell among measurement target cells in the processing target image, the process returns to step S10, and the subsequent steps described above are performed. Repeat steps. Further, when the measurement of the cell shape is continued to measure the cell shape formed in the other part of the gravure plate, the process returns to step S1 and the above-described steps are repeated. When the measurement of the cell shape is finished, the process exits from the image processing program 403.

  The effect of shortening the cell volume measurement time in the method of the present invention with respect to the conventional method will be described with reference to FIG. FIG. 6 is a table showing the time required for measuring the cell volume for sample images 1 and 2 as a table comparing the conventional method and the method of the present invention. As shown in FIG. 6, the sample image 1 includes one cell, and the time required for the conventional method was 25 seconds, but 15 seconds in the present invention. The sample image 2 includes 18 cells. In the present invention, the time required for the conventional method was 10 minutes, but 20 seconds. Thus, in the method of the present invention, the cell volume can be measured in a significantly shorter time than the conventional method. In addition, the same effect can be acquired also when measuring about cell shapes other than cell volume.

By using the present invention as described above, the following effects can be obtained.
1) Reduction of measurement time Since it is possible to automatically measure cells without distinguishing between channels and bank breaks, the inspection time for gravure plates can be greatly reduced.
2) Improvement of measurement accuracy When there are variations in the cell shape on the same plane and it is necessary to measure multiple cell shapes, it has been impossible to measure a sufficient number of cells due to limitations such as measurement time. Although it was bad, according to the present invention, the measurement of a plurality of cells can be performed efficiently, so that the plate inspection accuracy can be improved.

It is a figure (overall view) which shows an example of the structure in the cell shape measuring apparatus of this invention. It is a figure (block diagram) which shows an example of a structure in the cell shape measuring apparatus of this invention. It is a flowchart which shows the process of the operation | movement in the cell shape measuring apparatus of this invention. An example of a cell having a channel (A), an example of a plurality of cells having independent regions (B), a location determined to be out of bank (indicated by a circle), and a cell to be finally measured (6 in the center right) It is a figure which shows an example (C) of (one cell). An example (A) of a channel for connecting cells arranged in the printing direction (A) and an example (B) in which a bank that should separate the cells is partially cut and connected. FIG. It is a figure which shows as a table | surface which compared the required time concerning the measurement of a cell volume about the sample images 1 and 2 with the system of the past, and the system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microscope 2 Camera 3 Light source 31 Controller 32 Optical fiber 4 Personal computer 401 Image input / output means 402 Cell volume measuring means 403 Image processing program 41 Keyboard 42 Mouse 43 Display 44 A / D converter 5 Moving device 6 Elevating stage 7 Plate cylinder rotation Stand 8 Gravure version

Claims (2)

Imaging means for imaging a plurality of cells formed on the surface of the gravure plate to obtain a captured image;
In the captured image, the width in a direction orthogonal to the printing direction of a plurality of cells when the mesh is 100% formed by separating the banks in the direction orthogonal to the printing direction and connecting the cells in the printing direction. , A detection unit for detecting a connection part in the print direction of the cell as a part that is detected along the print direction and has a minimum width;
An opening area calculating means for calculating an opening area of a cell extracted with the bank and the detected connection as a boundary;
The opening area described above operations, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, a bank removal area detecting means for detecting a bank removal area,
Display means for displaying the presence of the bank break when the bank break is detected;
Parameter extraction means for extracting a parameter representing a cell shape for the cell when the bank break is not detected;
A gravure plate cell shape measuring apparatus comprising: An imaging process of capturing images of a plurality of cells formed on the surface of the gravure plate to obtain a captured image;
In the captured image, the width in a direction orthogonal to the printing direction of a plurality of cells when the mesh is 100% formed by separating the banks in the direction orthogonal to the printing direction and connecting the cells in the printing direction. , Detecting along the printing direction, the connection detection process of detecting the connection in the cell and the printing direction of the cell as the portion whose width is the minimum,
An opening area calculation process for calculating an opening area of a cell extracted with the bank and the detected connection as a boundary;
The opening area described above operations, by exceeding the predetermined range with respect to the opening area of the reference of the cell when 100% net, a bank out portion detection step of detecting a bank removal area,
A display process for displaying the presence of the bank break when the bank break is detected;
A parameter extraction process for extracting a parameter representing a cell shape for the cell when the bank break is not detected;
A gravure plate cell shape measuring method comprising:

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