Method and system for edge enhancement in gravure engraving

Abstract

The invention relates to an edge enhancing system in gravure carving, which belongs to the technical field of carving and comprises a carving machine and a carving station arranged on the carving machine. The track is mounted on the base; the bed head and the tailstock are slidably mounted on the track, so that the bed head and the tailstock can be close to each other and far away from each other; a first driving motor and a second driving motor. The invention also provides a method for enhancing the edge in gravure engraving, which is used for enhancing the image file data corresponding to the image, so that the image file data can be merged, modified or operated, and the image comprises at least one predetermined feature to improve the engraving effect of the image.

Description

Technical Field

[0001] The invention relates to the technical field of engraving, in particular to a method and system for edge enhancement in gravure engraving. Background Art

[0002] Gravure printing has the characteristics of thick ink layer, bright and uniform color, rich and clear layers, and strong three-dimensional effect, and its proportion in packaging printing is increasing. At the same time, since the ink of gravure printing is directly transferred from the mesh of the gravure to the surface of the substrate, the quality of the gravure mesh has a great influence on the quality of the printed product.

[0003] Since the 1960s, gravure platemaking technology has entered a stage of high quality, high speed and high precision. Before that, the production method was to corrode the plate surface with chemical substances. In 1962, the German HELL company produced the first gravure electronic engraving machine, and since then, it has entered the research and development of gravure pre-press. In 2004, ultra-high-speed engraving technology also came into being. However, the carving knife of the electronic engraving machine can only get one cell each time and its shape is closely related to the drum speed, the angle of the carving knife and the lateral feed speed, which leads to a series of problems. For example, when the overall image data processing is relatively simple and the resolution is low, the edge carving of some text and graphics is prone to "halo" or "ghosting", resulting in poor engraving effect. Therefore, a method and system for edge enhancement in gravure engraving are proposed to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method and system for edge enhancement in gravure engraving, which has the advantages of improving image processing effect and thus improving engraving effect, and solves the problem of poor engraving effect caused by relatively simple image processing.

[0005] To achieve the above object, the present invention provides the following technical solution: a system for edge enhancement in gravure engraving, comprising an engraving machine and an engraving station arranged on the engraving machine, wherein the engraving machine comprises: A base; a track mounted on the base; a headstock and a tailstock mounted on the track for sliding movement so that the headstock and the tailstock can move closer to and farther from each other; A first drive motor and a second drive motor, capable of driving the headstock and the tailstock to move toward or away from each other; A support member installed on the headstock and the tailstock and a plate roller placed on the support member: one end of the plate roller is a first receiving end (a), and the other end is a second receiving end (b), so the first receiving end (a) and the second receiving end (b) are both provided with receiving openings, and the cross-section of the receiving openings is conical, the support member acts on the engraving station of the engraving machine to engage and rotate the plate roller, and the plate roller is provided with a processing surface for processing; Engraving equipment arranged on the base: the engraving equipment is composed of a third driving motor, an engraving head, an engraving needle and a trolley, the engraving head is slidably mounted on the trolley, the trolley is slidably mounted on the base, the engraving needle is mounted on the engraving end of the engraving head, the third driving motor is mounted on the trolley, and the engraving head is driven by the third driving motor to approach and move away from the plate roller in a radial direction to the rotation axis of the plate roller; The fourth driving motor is used to drive the supporting member to rotate; A programmable controller and a digital-to-analog converter electrically connected thereto: the controller is used to control the operation of the engraving machine and also controls the first drive motor, the second drive motor, the third drive motor and the fourth drive motor. The controller is also connected to the engraving head and drives the engraving head so that at least one area or cell of controlled depth is engraved when the carriage passes through the plate roller.

[0006] Preferably, the supporting member is composed of a first supporting tapered shaft (a) and a second supporting tapered shaft (a), and the first supporting tapered shaft (a) and the second supporting tapered shaft (a) are respectively mounted with a headstock and a tailstock.

[0007] Preferably, the tapered end of the first supporting tapered shaft (a) away from the head of the bed is the end close to the plate roller, and the specifications of the tapered ends of the first supporting tapered shaft (a) and the second supporting tapered shaft (a) are compatible with the specifications of the receiving openings of the first receiving end (a) and the second receiving end (b) on the plate roller.

[0008] Preferably, the fourth driving motor is mounted on the bed head and is fixedly connected to an end of the first supporting conical shaft (a) away from the plate roller, and the engraving head is a diamond engraving needle.

[0009] The method for edge enhancement in gravure engraving of the present invention comprises the following steps: S1. determining an engraving pattern comprising a plurality of engraving regions, each engraving pattern comprising a transition or edge region, the engraving regions being arranged into a series of nested columns, each column having a plurality of cells or engraving regions; S2, engraving by column, the engraving pattern corresponds to the line data and the continuous tone data; S3, dividing the engraving area according to the engraving pattern, and processing the edge area between the engraving areas to generate an image data file, the image data file includes continuous tone data, line data and transition data; the transition data is composed of a part of each of the line data and the continuous tone data; S4: identifying transition data corresponding to the transition region in the image data file, processing the image data file, and providing a processed image with or without edge enhancement, thereby generating or executing a selective edge enhancement file; S5: Printing according to the image data file and the edge enhancement file.

[0010] S4 includes the following steps: S41, transition data corresponding to the transition area in the image data file is selectively excluded from edge enhancement, and tone data or line data corresponding to the engraving area in the image data file is enhanced; S42, generating a continuous tone data file corresponding to the continuous tone data, a line data file corresponding to the line data of the image to be engraved, and a mask data file, wherein the mask data file is used to distinguish the continuous tone area of ​​the entire image to be engraved from the line work; or S43. The operator manually inputs the mask data file.

[0011] The S5 includes: S51, receiving a continuous tone data file, a line data file and a mask data file related to the image to be engraved, wherein one or both of the continuous tone or line data files have been rescreened to a predetermined resolution and merged with the mask data file to form approximately the same resolution; S52, after opening the merged and rescreened continuous tone data file and line data file, the target mask data file is opened; obtaining data pixels from the merged and rescreened continuous tone data file and line data file, and also obtaining corresponding mask pixels from the generated target mask data file; S53, determining the mask pixel value, the range is 0-255; S54, printing according to the mask pixels corresponding to the transition data and the continuous tone data file and the line data file.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects: The method and system for edge enhancement in gravure engraving provide an improved engraving method and system for enhancing image file data corresponding to an image so that the image file data can be merged, modified or manipulated so that the image contains at least one predetermined feature, such as selectively enhanced or sharpened edges, to improve the image engraving effect. At the same time, it can be used in various types of engraving, such as gravure engraving, laser engraving and etching. These features can also be used for printing and proofing to improve the applicability of the entire method and system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall schematic diagram of the engraving machine; Figure 2 It is a prior art that the engraved pattern of the plate roller shows multiple engraved areas, including partial views of continuous tone and line work areas; Figure 3 It is a prior art that the plate roller engraving pattern shows a partial view of multiple engraving areas when non-selective edge enhancement is performed on all engraving areas; Figure 4 Is a partial view of the engraved version of the present invention roller for selective edge enhancement; Figure 5 Is a flowchart of a method in a controller according to the present invention; Fig. 6A and 6B Combined to show a flow chart of a merge and rescreen process for merging and rescreening continuous tone and line data associated with an image; Figure 7 It is a general process for rescreening mask files for rescreening data mask files; Figure 8 is a flow chart of the merge edge process performed by the controller; Fig. 9 It is an image view engraved according to the old technology showing "halo" or "ghosting" problems; Fig.10 It is the effect diagram of the image after being processed by the method of the present invention.

[0014] Fig.11A is a view of the line work portion of the image; Fig. 11B is a view of the continuous-tone portion of the image; Fig. 11C is with Fig.11A and Fig. 11B The mask view corresponding to the line work and continuous tone parts of the image.

[0015] In the figure: 10, engraving machine; 12, base; 13, processing surface; 14, plate roller; 14a, first receiving end; 14b, second receiving end; 15, engraving station; 16, headstock; 16a, first supporting tapered shaft; 18a, second supporting tapered shaft; 17, controller; 18, tailstock; 19, digital-to-analog converter; 20, track; 21, third drive motor; 22, engraving head; 23, engraving needle; 24, trolley; 26, double arrow; 28, fourth drive motor; 29, amplifier; 46, first drive motor; 48, second drive motor. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 The system for edge enhancement in gravure engraving in this embodiment includes an engraving machine 10 and an engraving station 15 provided on the engraving machine 10. The engraving machine 10 includes: A base 12; a track 20 mounted on the base 12; a headstock 16 and a tailstock 18 slidably mounted on the track 20 so that the headstock 16 and the tailstock 18 can move closer to and farther from each other; A first drive motor 46 and a second drive motor 48 can respectively drive the headstock 16 and the tailstock 18 to move toward or away from each other. In order to drive the headstock 16 and the tailstock 18 to slide stably on the base 12, a slide groove compatible with the track 20 can be opened at the lower end of the headstock 16 and the tailstock 18, so that the headstock 16 and the tailstock 18 can be stable along the parallel horizontal plane. In order to enable the first drive motor 46 and the second drive motor 48 to drive the headstock 16 and the tailstock 18 respectively, it is only necessary to assemble a conventional screw rod on the output shaft of the first drive motor 46 and the second drive motor 48, and the screw rod has a reverse thread; for the convenience of description, it is not shown in the figure. The screw rod is used to pass through the headstock 16 and the tailstock 18, so as to drive the headstock 16 and the tailstock 18 to move and adjust. The rotation of the output shaft of any one of the first drive motor 46 or the second drive motor 48 can make the headstock 16 and the tailstock 18 approach or move away from each other. The support members (eg, Figure 1The support member includes a shaft 16a, 18a in the engraving machine 10 and a plate roller 14 placed on the support member: one end of the plate roller 14 is a first receiving end 14a, and the other end is a second receiving end 14b, so the first receiving end 14a and the second receiving end 14b are both provided with receiving openings, and the cross-section of the receiving openings is conical, the support member acts on the engraving station 15 of the engraving machine 10 for engaging and rotating the plate roller 14, and the plate roller 14 is provided with a processing surface 13 for processing; Engraving device arranged on the base 12: the engraving device is composed of a third driving motor 21, an engraving head 22, an engraving needle 23 and a trolley 24. The engraving head 22 is slidably mounted on the trolley 24, the trolley 24 is slidably mounted on the base 12, the engraving needle 23 is mounted on the engraving end of the engraving head 22, the third driving motor 21 is mounted on the trolley 24, the engraving head 22 is driven by the third driving motor 21 to slide along the length direction of the plate roller 14, and to approach and move away from the plate roller 14, the engraving needle 23 is a diamond engraving needle, and at the same time, the engraving device in the present invention can also be used together with other types of engraving devices, including, for example, laser engraving devices; Moreover, the whole engraving device also includes a screw rod and a drive motor, which can drive the trolley 24 along the Figure 1 The motor and the lead screw are conventional and well-known devices, so they are not described in detail in the text; The fourth driving motor 28 is used to drive the supporting member to rotate; A programmable controller 17 and a digital-to-analog converter 19 electrically connected thereto: the controller 17 is used to control the operation of the engraving machine 10, and also controls the first drive motor 46, the second drive motor 48, the third drive motor 21 and the fourth drive motor 28. The controller 17 is also connected to the engraving head 22, and excites and drives the engraving head 22, so that when the trolley 24 passes through the plate roller 14, at least one area or cell of controlled depth is engraved. The specific real-time method is described in the method below.

[0018] It should be noted that the supporting member is composed of a first supporting conical shaft 16a and a second supporting conical shaft 18a, and the first supporting conical shaft 16a and the second supporting conical shaft 18a are respectively installed on the headstock 16 and the tailstock 18, and the conical end of the first supporting conical shaft 16a away from the headstock 16 is the end close to the plate roller 14, and the specifications of the conical ends of the first supporting conical shaft 16a and the second supporting conical shaft 18a are adapted to the receiving opening specifications of the first receiving end 14a and the second receiving end 14b on the plate roller 14.

[0019] The plate roller 14 placed between the first supporting conical shaft 16a and the second supporting conical shaft 18a is supported and engaged by the first supporting conical shaft 16a and the second supporting conical shaft 18a located on the headstock 16 and the tailstock 18; and the entire engraving machine 10 also includes an amplifier 29, and the amplifier 29 is also electrically connected to the controller 17.

[0020] Among them, the fourth drive motor 28 is installed on the headstock 16 and fixedly connected to the end of the first supporting conical shaft 16a away from the plate roller 14, so that the started fourth drive motor 28 can drive the first supporting conical shaft 16a to rotate, thereby driving the engaged plate roller 14 to rotate synchronously.

[0021] See also Figures 1 to 8 In this embodiment, the edge enhancement method in gravure engraving improves the edge clarity of an engraved pattern 50 including a plurality of engraved areas (e.g., areas 52 and 54 on the processing surface 13 of the plate roller 14). Figure 4 Only a portion of the working surface 13 of the plate roller 14 is shown, and the plate roller 14 rotates around the plate roller axis to produce the working surface movement or rotation. Figure 4 As shown by arrow X in FIG. 1 , here, the transition or edge region 58 is defined by the engraved regions 52 and 54 along the dashed line E. Typically, the engraved regions 52 and 54 are arranged in a series of nested columns, each column having a plurality of cells 60 or engraved regions 62; The engraving machine 10 can be formed by starting from an imaginary starting line, Figure 4 The engraving device begins engraving a series of nested columns, such as column 60a, at the position of the middle mark SL to produce the engraved pattern 50. The engraving device continues engraving until it crosses the imaginary starting line SL and continues to the beginning of another column, such as column 60b; that is, engraving one column at a time.

[0022] In this embodiment, the engraved pattern 52 corresponds to line data, and the pattern 54 corresponds to continuous tone data, that is, the engraved pattern 52 is engraved according to the line data; the pattern 54 is engraved according to the continuous tone data. Here, the columns 60b and 62a together define a transition edge 58 in a transition area 63, and the transition edge corresponds to the area including two columns (60b, 62a) and the area between them, where the patterns 52 and 54 meet, that is, the pattern 52 and the pattern 54 are the area between two adjacent columns. The system and method provided by the present invention are used to identify the transition data corresponding to this transition area 63 and process the transition data as needed.

[0023] The method of edge enhancement in gravure engraving in this embodiment: A system and method for creating or engraving an image using continuous tone data, line data, and transition data is generated based on an image data file by combining, adjusting, modifying, or possibly even eliminating some of this data to provide a processed image data file containing at least one predetermined feature with selectively enhanced edges. It should be understood that the above-mentioned transition data is composed of a portion of the line data and a portion of the continuous tone data, and these two portions are adjacent to each other after being mapped to the engraved pattern. For example, according to the present invention, by identifying transition data associated with a transition area (such as transition area 63) in an image data file, and then processing the image data file to provide a processed image containing edge enhancement or no enhancement, an image with selective edge enhancement is generated or performed.

[0024] The functionality of the present invention enables image data files to be processed so that transition regions, such as transition area 63, are selectively excluded from existing edge enhancement, while edge regions 52a within engraved pattern 52 may also be enhanced.

[0025] The function of the present invention is achieved by generating or providing a continuous tone data file LW corresponding to the continuous tone portion 54 of the image to be engraved and a line data file CT corresponding to the line work portion 52 of the image to be engraved, and generating a mask data file corresponding to a mask or template, which distinguishes the continuous tone area 54 of the entire image to be engraved from the line work area 52.

[0026] The mask data file is usually input by the operator in binary form, indicating the location of the area of ​​continuous tone data or line data, such as Fig. 6A The line images and Figure 6B Thus, pixels in the continuous tone data file LW associated with continuous tone areas in the image (such as area 54) are set equal to 255 in the mask data file, while line pixels in the line work data file CT associated with line work areas (such as area 52) are set equal to zero, and these pixel values ​​can also be set to any predetermined level or position entered by the operator to generate a mask with any desired mask density characteristics.

[0027] The controller 17 receives a continuous tone data file LW, a line data file CT and a mask data file related to the image to be engraved, one or both of the continuous tone data file LW or the line data file CT are rescreened to a predetermined resolution, and the above files are merged using the mask data file to form a rescreened mask file.

[0028] The rescreening here is due to the fact that the storage resolution of the continuous tone data file LW is about 100 to 500 dots per inch ("dpi"), compared to the storage resolution of the line work data file CT which is usually about 1000 to 3000 dpi, so it is best to rescreen one or both the continuous tone data file LW and the line work data file so that they are at approximately the same resolution.

[0029] The continuous tone data file LW is rescreened to a resolution substantially the same as the line data file CT. Once the continuous tone data file LW and the line data file CT are rescreened to compatible resolutions, they are merged or screened together using the mask data file. The merging and rescreening process of the present invention is as follows: Figure 6A-6B shown and described below.

[0030] Once the continuous tone data file LW and the line work data file CT are merged and rescreened, the mask data file is rescreened (process step 68) from an initial mask file resolution of approximately 1000 to 3000 dpi to a predetermined mask file resolution, typically corresponding to the desired engraving resolution. In the described embodiment, the predetermined mask file resolution is approximately 100 to 500 dpi. The rescreened mask data file typically contains three density ranges of pixel values, with continuous tone area pixels set to 255, line work area pixels set to 0, and transition area pixels having a value range of hexadecimal 1-254. Therefore, this rescreened mask data file can be subsequently used to identify continuous tone areas, line work areas, and transition areas between continuous tone and line work.

[0031] Once the mask data file is rescreened, the merged and rescreened continuous tone data file LW and line data file CT generated by the executed program, as well as the rescreened mask data file, will be used to perform the continuous tone and line work merge edge processing program. After completing the merge edge processing program, the controller 17, the digital-to-analog converter 19 and the amplifier 29 will generate engraving drive signals, which activate the engraving head 22 to engrave the merged image pattern 50.

[0032] The present system and method enables images 50, images containing or representing multiple data sets and / or representing multiple density values ​​to be merged and their associated data to be selectively processed to achieve predetermined characteristics, as described earlier herein, one predetermined feature is selectively enhancing some or all of the image data, such as edge 54a of an engraved area defined by line work columns 54b and 54c within line work area 54, similarly, continuous tone edges, such as edge 52a defined by continuous tone columns 52b and 52c, may be enhanced while transition edges within transition area 63, such as transition edge 58 defined by columns 60b and 62a, are selectively not modified, which helps to reduce or eliminate "halo" or "ghosting" image patterns in image areas; like Figure 7 and Figure 8 , the method and procedure for performing the above selective enhancement are described below. First, the controller 17 receives the continuous tone data file LW and the line data file CT corresponding to the image, and the mask data file, and stores them in the buffer; The system program obtains a single circle of continuous tone data from the continuous tone data file LW, and the controller 17 also obtains a circle of line data from the line data file CT, and obtains a circle of mask data from the mask data file. Here, the continuous tone data file LW, the line data file CT and the mask data file may have the same or different resolutions. Therefore, in order to merge the two data files together, at least one data file may need to be scaled, sampled or re-screened to reach the resolution of the other data file, or the two data files may be re-screened to a common resolution for further processing.

[0033] In the described implementation, the resolution controller 17 in which the continuous tone data is rescreened as line data obtains continuous tone pixels from the continuous tone data file LW. Similarly, line work pixels and mask pixels are obtained from the line data file CT and the mask data file, respectively, and the obtained continuous tone pixels, line work pixels and mask pixels correspond to the same positions in the image to be engraved.

[0034] Determine whether the acquired circle of mask data pixels is equal to 255, if so, this will represent a continuous tone pixel, so the corresponding continuous tone pixel is stored in the corresponding Rev buffer file of the controller 17, if not, the corresponding line pixel is stored in the corresponding Rev buffer file by the controller 17; In addition, it is necessary to determine whether there are more pixels in the circle of data being evaluated. If so, the routine loops the above-mentioned screening, merging and storage until all pixels in the circle of data are stored in the Rev buffer file. The merged data in the Rev buffer file will be re-screened to the final target or engraving resolution.

[0035] Since the resolution may vary depending on the engraving, the controller 17 can be programmed to re-screen the data associated with the Rev buffer file to various resolutions. In the described embodiment, the engraving typically has a resolution between approximately 100 and 500 dpi, so the Rev buffer file is re-screened to between 100 and 500 dpi.

[0036] The controller 17 determines whether the image to be processed has more data cycles according to the rescreened Rev buffer file, and repeats the above process until all the data cycles are screened, merged and stored.

[0037] like Figure 5 As shown, the method and system of the present invention then proceeds to process the data in the merged and rescreened continuous tone and line work data file CT so that it has predetermined characteristics, such as a composite continuous tone and line work image having transition areas that define edges that can be selectively enhanced or not enhanced as desired.

[0038] The present invention also facilitates enhancing the continuous tone region 54 ( Figure 4 ) or the edge within the line work area 52: Data processing is carried out in accordance with Figure 8 The program flow shown in FIG. 1 is implemented in that the controller 17 first opens a merge / edge file for receiving data, and also opens a merged and rescreened continuous tone and line data file CT, which is in Figure 6A-6B Description of the merge process generated.

[0039] After the controller 17 opens the merged and rescreened continuous tone and line data file CT, the target mask data file is opened, the controller 17 obtains data pixels from the merged and rescreened continuous tone and line data file CT, and also obtains the target mask data file from the merged and rescreened continuous tone and line data file CT. Figure 7 The process described above generates the target mask data file to obtain the corresponding mask pixels.

[0040] When making a decision, it is determined whether the mask pixel is equal to a density value of 255. In the described embodiment, the density values ​​stored in the various data files range from 0 to 255, where 0 represents a bright area in the image and 255 represents a dark area or a completely black area in the image. However, any suitable density value may be selected as desired. Here, the rescreened mask file contains multiple density values, continuous tone data is represented by a hexadecimal value of 255, line data is represented by a hexadecimal value of 0, and the density value of the transition data at the junction of continuous tone and line work ranges from a hexadecimal value of 1-255.

[0041] It is determined whether the mask pixels around the mask pixel are 255. If so, it indicates that the corresponding mask pixel and the surrounding pixels have the same value, namely 255, which corresponds to a continuous tone area.

[0042] At this point, the program will enter the continuous tone edge processing program. In the described implementation, the continuous tone edge processing receives the merged pixels from the merged and rescreened continuous tone data file LW and processes them to highlight or emphasize the continuous tone area 54 ( Figure 4 ) in the edge, such as Figure 4 As shown in the edge area 54a in FIG. 1 , the data of the continuous tone column 54b has been processed so that when the corresponding engraving area is engraved, they have a slightly greater density than before processing, and similarly, they are not as dense as the adjacent continuous tone engraving area column ( Figure 4 The continuous tone data associated with column 54c in the image 50 is also processed so that the density of the engraved area is slightly smaller than before the processing. This processing has the effect of highlighting the continuous tone edge area in 54a of the continuous tone portion of the image 50. The specific effect is as follows Fig.10 , Fig.11A , Fig. 11B and Fig. 11C .

[0043] When executing the continuous tone edge procedure ( Figure 8 ), the controller 17 stores the merged pixels from the merged and rescreened continuous tone and line data file CT in a merge / edge file.

[0044] If the decision determines that the mask pixel is not 255, which is negative, the program continues to execute the decision to determine whether the mask pixel is 0; in the decision, it is determined whether the corresponding mask pixel is equal to zero. If so, it means that the mask pixel corresponds to the line pixel in the image, then it is determined whether the mask pixels surrounding the corresponding mask pixel are also equal to zero. If the mask pixels surrounding the corresponding mask pixel are all zero, the line work edge program is executed on the merged pixels from the merged and re-screened continuous tone and line data file CT, which corresponds to reading the corresponding mask pixels from the target mask file.

[0045] This merged pixel is processed so that the engraved area is enhanced or enlarged relative to the normal engraved area. Similarly, the density of the engraved column 52c is reduced relative to the engraved area of ​​the normal column, which in turn causes the contrast of the line work edge area 52a to be emphasized or enhanced. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for edge enhancement in gravure engraving, comprising an engraving machine (10) and an engraving station (15) arranged on the engraving machine (10), characterized in that: The engraving machine (10) comprises: A base (12); a track (20) mounted on the base (12); a headstock (16) and a tailstock (18) slidably mounted on the track (20) so that the headstock (16) and the tailstock (18) can move closer to and farther from each other; A first drive motor (46) and a second drive motor (48), capable of respectively driving the headstock (16) and the tailstock (18) to move towards or away from each other; A support member installed on a headstock (16) and a tailstock (18) and a plate roller (14) placed on the support member: one end of the plate roller (14) is a first receiving end (14a), and the other end is a second receiving end (14b), so that the first receiving end (14a) and the second receiving end (14b) are both provided with receiving openings, and the cross-section of the receiving openings is conical, the support member acts on an engraving station (15) of an engraving machine (10) for engaging and rotating the plate roller (14), and the plate roller (14) is provided with a processing surface (13) for processing; An engraving device arranged on a base (12): the engraving device comprises a third driving motor (21), an engraving head (22), an engraving needle (23) and a trolley (24); the engraving head (22) is slidably mounted on the trolley (24); the trolley (24) is slidably mounted on the base (12); the engraving needle (23) is mounted on the engraving end of the engraving head (22); the third driving motor (21) is mounted on the trolley (24); the engraving head (22) is driven by the third driving motor (21) to move closer to and farther from the plate roller (14) along a direction radial to the rotation axis of the plate roller (14); A fourth driving motor (28): used for driving the supporting member to rotate; A programmable controller (17) and a digital-to-analog converter (19) electrically connected thereto: the controller (17) is used to control the operation of the engraving machine (10), and also controls a first drive motor (46), a second drive motor (48), a third drive motor (21) and a fourth drive motor (28); the controller (17) is also connected to an engraving head (22) and drives the engraving head (22) so that when the carriage (24) passes through the plate roller (14), at least one area or cell of controlled depth is engraved.

2. The system for edge enhancement in gravure engraving according to claim 1, characterized in that: The support member is composed of a first supporting tapered shaft (16a) and a second supporting tapered shaft (18a), and the first supporting tapered shaft (16a) and the second supporting tapered shaft (18a) are respectively mounted on the headstock (16) and the tailstock (18).

3. The system for edge enhancement in gravure engraving according to claim 2, characterized in that: The conical end of the first supporting conical shaft (16a) away from the headstock (16) is an end close to the plate roller (14), and the specifications of the conical ends of the first supporting conical shaft (16a) and the second supporting conical shaft (18a) are compatible with the specifications of the receiving openings of the first receiving end (14a) and the second receiving end (14b) on the plate roller (14).

4. The system for edge enhancement in gravure engraving according to claim 3, characterized in that: The fourth drive motor (28) is mounted on the bed head (16) and is fixedly connected to an end of the first supporting tapered shaft (16a) away from the plate roller (14); the engraving head (22) is a diamond engraving needle.

5. A method for edge enhancement in gravure engraving, characterized in that: The following steps are involved: S1. determining an engraving pattern comprising a plurality of engraving regions, each engraving pattern comprising a transition or edge region, the engraving regions being arranged into a series of nested columns, each column having a plurality of cells or engraving regions; S2, engraving by column, the engraving pattern corresponds to the line data and the continuous tone data; S3, dividing the engraving area according to the engraving pattern, and processing the edge area between adjacent engraving areas to generate an image data file, the image data file including continuous tone data, line data and transition data; the transition data is composed of a part of each of the line data and the continuous tone data; S4: identifying transition data corresponding to the transition region in the image data file, processing the image data file, and providing a processed image with or without edge enhancement, thereby generating or executing a selective edge enhancement file; S5: Printing according to the image data file and the edge enhancement file.

6. The method for edge enhancement in gravure engraving according to claim 5, characterized in that: S4 includes the following steps: S41, transition data corresponding to the transition area in the image data file is selectively excluded from edge enhancement, and tone data or line data corresponding to the engraving area in the image data file is enhanced; S42, generating a continuous tone data file corresponding to the continuous tone data, a line data file corresponding to the line data of the image to be engraved, and a mask data file, wherein the mask data file is used to distinguish the continuous tone area of ​​the entire image to be engraved from the line work; or S43. The operator manually inputs the mask data file.

7. The method for edge enhancement in gravure engraving according to claim 6, characterized in that: The S5 includes: S51, receiving a continuous tone data file, a line data file and a mask data file related to the image to be engraved, wherein one or both of the continuous tone or line data files have been rescreened to a predetermined resolution and merged with the mask data file to form approximately the same resolution; S52, after opening the merged and rescreened continuous tone data file and line data file, the target mask data file is opened; obtaining data pixels from the merged and rescreened continuous tone data file and line data file, and also obtaining corresponding mask pixels from the generated target mask data file; S53, determining the mask pixel value, the range is 0-255; S54, printing according to the mask pixels corresponding to the transition data and the continuous tone data file and the line data file.

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