Radiography digital standard reference negative film
Through the design of the digital standard of radio photography with a variety of test targets, referring to the negatives, solving the problem of low evaluation efficiency of digital devices in existing technologies, achieved more efficient quality level identification and lower manufacturing difficulty, and meet the enterprise’s enterprise’s Actual needs.
Patent Information
- Application Number
- CN202420052548.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-09
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-09
AI Technical Summary
The evaluation efficiency of the standard reference negative film digital device given in the existing national standards is inefficient and cannot fully cover all evaluation indicators required for the quality level identification of negative film digital device.
Designed a reference negatives of the digital standardization standard of ray camera, including orthogonal spatial resolution test targets, step density test targets, parallel line test targets and linear scale test targets. Through the arrangement and combination of these test targets Structural complexity to meet the evaluation indicators of digital device quality level identification.
It has improved the efficiency of the quality level identification of digital device, reduced the difficulty of processing and manufacturing of enterprises, avoids the waste of the financial resources of high -priced purchases of foreign standard negatives, met the actual needs of enterprises, and improved the level of modern quality management.
Smart Images
Figure CN222420046U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of digital processing of industrial radiographic films, and in particular relates to a digital standard reference film for radiographic films. Background Art
[0002] As a conventional nondestructive testing technology, radiography has been widely used in the welding and casting process inspection of large and complex parts of high-end equipment, and a large number of radiographic films have been produced. At present, my country's radiographic testing industry generally has problems such as a large number of industrial radiographic films, high storage costs, low retrieval efficiency, and inability to share remotely. With the improvement of quality management requirements of modern enterprises, converting the information in physical radiographic films into digital data to replace physical films to achieve digital storage of films has become an important demand of current enterprises, and is also the data basis for the current realization of automated and intelligent defect identification and film evaluation. Based on the above needs, many research institutions and related enterprises at home and abroad have developed and applied radiographic film digitization devices and systems, but before using the digital device, it is necessary to identify the quality level of the digital device. Only radiographic films scanned by digital devices that reach the corresponding level can completely replace physical films for digital storage. At present, the method of judging the quality level of the digital device is mainly to scan the standard reference film, and then identify it based on the obtained standard film scan image and its preset related parameters. Therefore, it is crucial whether the radiographic standard reference film is accurate and reliable.
[0003] At present, the manufacturers of standard reference films for digitization of industrial radiographic films are mainly foreign companies such as Kodak, FUJIFILM, and AGFA. my country's current national standard GB / T 26141-2010 stipulates the evaluation procedures for the basic performance parameters of the radiographic film digitization process, and is accompanied by the same standard reference film as the American ASTM E1936. However, both foreign reference films and reference films used in my country's GB / T 26141-2010 have problems such as complex structure and difficult processing by enterprises. At the same time, when evaluating digital devices based on this standard reference film, there are also problems such as cumbersome process, complex calculation, and low evaluation efficiency. This results in enterprises only being able to use simple standard density films in the actual evaluation process of digital devices, or purchasing expensive imported standard films from abroad at high prices, resulting in a waste of financial and material resources for enterprises, and failing to meet the actual needs of current enterprise film digitization management.
[0004] Therefore, in view of the technical problems that the standard reference film digitization device evaluation given in the existing national standards is inefficient and cannot fully cover all the evaluation indicators required for the quality grade identification of film digitization devices, it is necessary to design a more concise, effective and easy-to-process radiographic standard reference film for evaluating the imaging quality of radiographic film digitization devices. Utility Model Content
[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to provide a standard reference film for digitization of radiography to solve the technical problems that the evaluation efficiency of the standard reference film digitization device given in the existing national standard is low and it cannot fully cover all the evaluation indicators required for the quality grade identification of the film digitization device.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] The utility model discloses a radiographic digital standard reference film, comprising a base plate, orthogonal spatial resolution test targets symmetrically arranged at the four corners of the base plate, step density test targets arranged in the horizontal direction of the center area of the base plate and in the vertical direction of the right area, parallel line pair test targets arranged in the horizontal direction of the middle upper area of the base plate and in the vertical direction of the middle lower area, and linear scale test targets arranged in the horizontal and vertical directions of the base plate.
[0008] Preferably, the size of the radiographic digital standard reference film is 200×250 mm 2 .
[0009] Preferably, the background density of the radiographic digitization standard reference film is D=3.5±0.5.
[0010] Preferably, the orthogonal spatial resolution test target consists of 4 groups of identical orthogonal line pairs, with three targets in each group respectively located at 0 degrees, 45 degrees and 90 degrees, with the maximum resolution facing the corner of the radiographic digitized standard reference film.
[0011] Preferably, the maximum resolution of the orthogonal spatial resolution test target is 20lp / mm, and the minimum resolution is 1lp / mm, wherein the minimum density of dark lines is not less than D=3, and the maximum density of bright lines is not higher than D=0.5; reference marks are used to indicate spatial resolutions of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15 and 20lp / mm.
[0012] Preferably, the step density test target includes 2 sets of a series of step targets of uniform size from low to high optical density.
[0013] Preferably, the tolerance of the step density test target for ∆=0.02 optical density change is ±0.005; the tolerance of the optical density change for ∆=0.5 is ±0.05; the actual optical density value of each step should be within ±0.10 of the declared value.
[0014] Preferably, the step density test target covers optical densities of D=0.5 and D=4.5, divided into 13 blocks, including approximate densities: 4.50, 4.02, 4.00, 3.50, 3.02, 3.00, 2.50, 2.02, 2.00, 1.50, 1.02, 1.00 and 0.5; the size of each block is 10×20mm 2 .
[0015] Preferably, the parallel line pair test target includes 2 sets of a series of parallel line pair scales parallel to each other; the spatial resolution of the parallel line pair scales starts from no more than 0.5lp / mm and increases to no less than 20lp / mm, and the minimum density of dark lines is no less than D=3, and the maximum density of bright lines is no more than D=0.5.
[0016] Preferably, each scale value of the linear scale test target is 25 mm.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] The utility model discloses a radiographic digitization standard reference film, comprising a base plate, orthogonal spatial resolution test targets symmetrically arranged at the four corners of the base plate, step density test targets arranged in the horizontal direction of the center area of the base plate and in the vertical direction of the right area, parallel line pair test targets arranged in the horizontal direction of the middle upper area of the base plate and in the vertical direction of the middle lower area, and linear scale test targets arranged in the horizontal and vertical directions of the base plate; four different test targets are placed on different areas of the standard reference film at the same time, and can be used for calibration and comparison of optical density of a film digitization device by comparing with background density. Orthogonal spatial resolution test targets and parallel line pair test targets are mainly used to evaluate the spatial resolution of film digitizers. The spatial resolution capability is determined by measuring the minimum line width that the digitizer can distinguish. A higher spatial resolution means that the digitizer can clearly distinguish smaller details. Step density test targets can be used to evaluate the density range and density contrast sensitivity of film digitizers. The density range can be determined by measuring the maximum and minimum density levels that the digitizer can distinguish. A larger density range means that the digitizer can display a wider range of gray levels. A higher density contrast sensitivity means that the device can more accurately display subtle optical density changes. Linear scale test targets can be used to calculate the pixel size of film digitizers. By measuring the number of pixels in different directions captured by the device, the difference between the actual line spacing and the known line spacing, etc., its pixel size and spatial linearity can be evaluated. Combining the results of all the above test targets, the image black resolution capability and image spatial resolution capability of the film digitizer can be evaluated, and then the performance level of the digitizer can be determined. The utility model mainly includes a series of test targets for performance evaluation of radiographic film digitizers. Compared with the existing standard reference film, the utility model arranges and combines different test targets. On the one hand, the information contained in the standard film after being scanned by a digitizing device can meet the evaluation indicators required for the quality grade identification of the digitizing device, mainly including spatial resolution, density range, density contrast sensitivity and pixel size; on the other hand, it greatly simplifies the structural complexity of the existing standard film and reduces the difficulty of processing and manufacturing for enterprises. The utility model rearranges and combines different test targets, simplifies the structural layout of the existing standard reference film, reduces the size, and can meet all the evaluation indicators required for the quality grade identification of the film digitizing device while greatly reducing the difficulty of processing and manufacturing for enterprises, avoiding the waste of financial resources caused by the high price of purchasing imported standard films from abroad, and meeting the actual needs of enterprises. The utility model can further improve the efficiency of quality grade identification of radiographic film digitizing devices, and then help enterprises realize digital storage of radiographic films, solve the problems of the existing industrial radiographic films, such as large quantity, high storage cost, low retrieval efficiency and inability to share remotely, and improve the level of modern quality management of enterprises.
[0019] Furthermore, the size of the radiographic digital standard reference film is 200×250 mm. 2 By reducing the size of the existing standard reference film and including all necessary test targets in a small area, it can also reduce the difficulty of enterprise processing and manufacturing to a certain extent, enhance its adaptability to digital devices of different specifications, and meet the actual use needs of enterprises.
[0020] Furthermore, the orthogonal spatial resolution test target consists of 4 groups of identical orthogonal line pairs, with three targets in each group located at 0, 45 and 90 degrees, with the maximum resolution facing the corner of the radiographic digitization standard reference film; it can ensure that images acquired from all directions can be displayed with the highest clarity and resolution, thereby evaluating the camera performance and image quality of the film digitization device, as well as the accuracy and consistency of the inspection system.
[0021] Furthermore, the step density test target includes two sets of a series of step targets of the same size from low to high optical density, which are arranged in the horizontal direction of the center area and the vertical direction of the right area of the radiographic digitization standard reference film; by arranging the step targets in the horizontal and vertical directions, the uniformity of the film digitization device in different directions can be evaluated. If the device can accurately display the same optical density level in both the horizontal and vertical directions, then the device can be considered to have good uniformity. By recording the actual density on the standard reference film and comparing it with the declared value, the accuracy and stability of the film digitization device can be verified.
[0022] Furthermore, the tolerance of the optical density change of ∆=0.02 of the step density test target is ±0.005; the tolerance of the optical density change of ∆=0.5 is ±0.05; the actual optical density value of each step should be within ±0.10 of the declared value; the processing difficulty of the standard reference film can be reduced.
[0023] Furthermore, the parallel line pair test target includes 2 sets of a series of parallel line pair scales that are parallel to each other; the spatial resolution of the parallel line pair scales starts from no more than 0.5lp / mm and increases to no less than 20lp / mm, and the minimum density of dark lines is no less than D=3, and the maximum density of bright lines is no more than D=0.5; the spatial resolution of the film digitization device is evaluated by measuring the line spacing on the scale.
[0024] Furthermore, each scale value of the linear scale test target is 25 mm; by measuring the actual size of each unit, the accuracy and stability of the film digitization device in dimensional measurement can be evaluated, and by measuring the measurement units in different areas, it can be verified whether it can maintain the same linear measurement results. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The utility model discloses a schematic diagram of a radiographic digital standard reference film.
[0026] Among them: 1-orthogonal spatial resolution test target; 2-step density test target; 3-parallel line pair test target; 4-linear scale test target. DETAILED DESCRIPTION
[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0029] The utility model is further described in detail below with reference to the accompanying drawings:
[0030] See also Figure 1 A schematic diagram of a radiographic digital standard reference film disclosed in the utility model is shown in FIG. Figure 1 As shown, the radiographic digital standard reference film includes an orthogonal spatial resolution test target 1, a step density test target 2, a parallel line pair test target 3 and a linear scale test target 4. The size of the standard reference film is 200×250 mm. 2 , four test targets are placed on different areas of the standard reference film at the same time, and the targets are placed in an environment with a background density of D=3.5±0.5. Placing four different test targets on different areas of the standard reference film at the same time and comparing them with the background density can be used to calibrate and compare the optical density of the film digitizing device.
[0031] Example 1
[0032] A radiographic digital standard reference film comprises a base plate, orthogonal spatial resolution test targets 1 symmetrically arranged at the four corners of the base plate, step density test targets 2 arranged in the horizontal direction of the center area of the base plate and in the vertical direction of the right area, parallel line pair test targets 3 arranged in the horizontal direction of the middle upper area of the base plate and in the vertical direction of the middle lower area, and linear scale test targets 4 arranged in the horizontal and vertical directions of the base plate. Compared with the existing standard reference film, the utility model arranges and arranges different test targets, on the one hand, so that the information contained in the standard film after being scanned by a digital device can meet the evaluation indicators required for the quality grade identification of the digital device, mainly including spatial resolution, density range, density contrast sensitivity and pixel size, etc.; on the other hand, it greatly simplifies the structural complexity of the existing standard film and reduces the difficulty of processing and manufacturing by enterprises.
[0033] Example 2
[0034] A radiographic digital standard reference film, comprising a base plate, orthogonal spatial resolution test targets 1 symmetrically arranged at the four corners of the base plate, step density test targets 2 arranged in the horizontal direction of the center area of the base plate and in the vertical direction of the right area, parallel line pair test targets 3 arranged in the horizontal direction of the middle upper area of the base plate and in the vertical direction of the middle lower area, and linear scale test targets 4 arranged in the horizontal and vertical directions of the base plate. The size of the radiographic digital standard reference film is 200×250mm 2 . The background density of the radiographic digitization standard reference film is D=3.5±0.5. Four different test targets are placed on different areas of the standard reference film at the same time, and can be used to calibrate and compare the optical density of the film digitization device by comparing with the background density. The image black resolution ability and image space resolution ability of the film digitization device can be evaluated, and then the performance level of the digitization device can be determined. The utility model rearranges and combines different test targets, simplifies the structural layout of the existing standard reference film, reduces the size, and can greatly reduce the difficulty of processing and manufacturing for enterprises while meeting all the evaluation indicators required for the quality grade identification of the film digitization device, avoid the waste of financial resources caused by the high price of the imported standard film, and meet the actual needs of the enterprise. The utility model can further improve the efficiency of the quality grade identification of the radiographic film digitization device, and then help the enterprise realize the digital storage of the radiographic film, solve the problems of the existing industrial radiographic film, such as the large number, high storage cost, low retrieval efficiency and inability to share remotely, and improve the level of modern quality management of the enterprise.
[0035] Example 3
[0036] A radiographic digital standard reference film, comprising an orthogonal spatial resolution test target 1, a step density test target 2, a parallel line pair test target 3 and a linear scale test target 4, the size of the standard reference film being 200×250 mm 2 , four test targets are placed on different areas of the standard reference film at the same time, and the targets are placed in an environment with a background density of D=3.5±0.5. Placing four different test targets on different areas of the standard reference film at the same time and comparing them with the background density can be used to calibrate and compare the optical density of the film digitizing device.
[0037] The orthogonal spatial resolution test target 1 consists of 4 groups of identical orthogonal line pairs. These 4 groups of orthogonal line pairs are located at the four corners of the standard reference film, and the three targets in each group are located at 0 degrees, 45 degrees and 90 degrees, respectively, with the maximum resolution pointing to the corner of the reference film. By setting the orthogonal line pairs at the corners of the reference film and using the positions of 0 degrees, 45 degrees and 90 degrees in each group, it is to ensure that the images acquired from all directions can be displayed with the highest clarity and resolution, so as to evaluate the camera performance and image quality of the film digitization device, and to check the accuracy and consistency of the system. The maximum resolution of these targets is 20lp / mm and the minimum resolution is 1lp / mm, where the minimum density of dark lines is not less than D=3 and the maximum density of bright lines is not higher than D=0.5. Reference marks are used to indicate the spatial resolution at 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15 and 20lp / mm.
[0038] Step Density Test Target 2 includes 2 sets of a series of step targets of the same size from low to high optical density, which are arranged horizontally in the center area of the standard reference film and vertically in the right area. By arranging step targets in the horizontal and vertical directions, the uniformity of the film digitizing device in different directions can be evaluated. If the device can accurately display the same optical density level in both the horizontal and vertical directions, then the device can be considered to have good uniformity. These step targets cover optical densities of D=0.5 and D=4.5 and are divided into 13 blocks with the following approximate densities: 4.50, 4.02, 4.00, 3.50, 3.02, 3.00, 2.50, 2.02, 2.00, 1.50, 1.02, 1.00 and 0.5. The size of each block is 10×20mm 2In order to reduce the difficulty of processing the standard reference film, the tolerance of the optical density change of ∆=0.02 is ±0.005, and the tolerance of the optical density change of ∆=0.5 is ±0.05. The actual optical density value of each step should be within ±0.10 of the declared value. The actual density should be recorded and placed in the standard reference film. By recording the actual density on the standard reference film and comparing it with the declared value, the accuracy and stability of the film digitization device can be verified.
[0039] The parallel line pair test target 3 includes two sets of parallel line pair rulers, which are arranged in the upper horizontal direction and the lower vertical direction of the middle area of the standard reference film. The spatial resolution of the film digitizing device is evaluated by measuring the line intervals on the rulers. The spatial resolution of this ruler starts from no more than 0.5lp / mm and increases to no less than 20lp / mm, and the minimum density of dark lines is no less than D=3, and the maximum density of bright lines is no more than D=0.5.
[0040] The linear scale test target 4 provides 25mm measurement units in the horizontal and vertical directions. By measuring the actual size of each unit, the accuracy and stability of the film digitizer in dimensional measurement can be evaluated, and by measuring the measurement units in different areas, it can be verified whether it can maintain the same linear measurement results.
[0041] The implementation principle of this application is as follows: This standard reference film is mainly used for the quality level identification of radiographic film digitization devices. When in use, this standard reference film should be scanned by a film digitization device to obtain a scanned digitized image. Then, based on this image, calculations can be performed to obtain the index information contained in different test targets on the reference film, and the film digitization device can be evaluated by combining different index requirements. Among them, the orthogonal spatial resolution test target 1 and the parallel line pair test target 3 are mainly used to evaluate the spatial resolution of the film digitizer. The spatial resolution capability is determined by measuring the minimum line width that the digitizer can distinguish. A higher spatial resolution means that the digitizer can clearly distinguish smaller details. The step density test target 2 can be used to evaluate the density range and density contrast sensitivity of the film digitizer. By measuring the maximum and minimum density levels that the digitizer can distinguish, its density range can be determined. A larger density range means that the digitizer can display a wider range of gray levels. A higher density contrast sensitivity means that the device can more accurately display subtle optical density changes. The linear scale test target 4 can be used to calculate the pixel size of the film digitizer. By measuring the number of pixels captured by the device in different directions, the difference between the actual line spacing and the known line spacing, etc., its pixel size and spatial linearity can be evaluated. Combining the results of all the above test targets, the image black resolution capability and image spatial resolution capability of the film digitizer can be evaluated, and then the performance level of the digitizer can be determined.
[0042] The utility model discloses a radiographic digital standard reference film, which is mainly used to realize the performance parameter evaluation and performance level determination of the digitization device used in the digital storage of radiographic films. It includes a number of test targets of different shapes located in different areas on the standard reference film. Through these test targets, the basic performance indicators of the film digitization device can be obtained, and then the performance level and application scope of the digitization device can be determined. On the basis of meeting the test requirements, the utility model greatly simplifies the structural complexity of the existing standard reference film, can greatly reduce the difficulty of processing and manufacturing the standard reference film, improve the test efficiency, and solve the problem of the lack of digital standard objects for industrial radiographic films in my country.
[0043] The above content is only for explaining the technical idea of the utility model and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.
Claims
1. A radiographic digital standard reference film, characterized in that: It includes a base plate, orthogonal spatial resolution test targets (1) symmetrically arranged at the four corners of the base plate, a step density test target (2) arranged in the horizontal direction of the center area of the base plate and in the vertical direction of the right area, a parallel line pair test target (3) arranged in the horizontal direction of the upper middle area of the base plate and in the vertical direction of the lower middle area, and a linear scale test target (4) arranged in the horizontal and vertical directions of the base plate; The size of this radiographic digital standard reference film is 200×250mm 2 ; The orthogonal spatial resolution test target (1) is composed of four groups of identical orthogonal line pairs, and the three targets in each group are respectively located at 0 degrees, 45 degrees and 90 degrees, with the maximum resolution facing the corner of the radiographic digitized standard reference film; The step density test target (2) includes two sets of a series of step targets with uniform optical density from low to high. The parallel line pair test target (3) comprises two sets of parallel line pair scales which are parallel to each other; the spatial resolution of the parallel line pair scales starts from no more than 0.5 lp / mm and increases to no less than 20 lp / mm, and the minimum density of dark lines is no less than D=3, and the maximum density of bright lines is no more than D=0.5; Each scale value of the linear scale test target (4) is 25 mm.
2. A radiographic digital standard reference film according to claim 1, characterized in that: The background density of the radiographic digital standard reference film is D=3.5±0.
5.
3. A radiographic digital standard reference film according to claim 1, characterized in that: The orthogonal spatial resolution test target (1) has a maximum resolution of 20 lp / mm and a minimum resolution of 1 lp / mm, wherein the minimum density of dark lines is not less than D=3 and the maximum density of bright lines is not more than D=0.5; reference marks are used to indicate spatial resolutions of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15 and 20 lp / mm.
4. A radiographic digital standard reference film according to claim 1, characterized in that: The tolerance of the optical density change of ∆=0.02 of the step density test target (2) is ±0.005; the tolerance of the optical density change of ∆=0.5 is ±0.05; the actual optical density value of each step should be within ±0.10 of the declared value.
5. A radiographic digital standard reference film according to claim 1, characterized in that: The step density test target (2) covers optical densities of D=0.5 and D=4.5 and is divided into 13 blocks, including approximate densities: 4.50, 4.02, 4.00, 3.50, 3.02, 3.00, 2.50, 2.02, 2.00, 1.50, 1.02, 1.00 and 0.5; the size of each block is 10×20 mm 2 .