CN116109815A - Positioning method and device for test card calculation area and terminal equipment - Google Patents
Positioning method and device for test card calculation area and terminal equipment Download PDFInfo
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Abstract
The application is applicable to the technical field of reagent detection, and particularly relates to a positioning method, device and terminal equipment for a test card calculation area. The method comprises the following steps: acquiring an initial image of a test card; calculating the gray value of each pixel point in the initial image; generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel point in the initial image along the first direction, the ordinate represents the average gray value of each row of pixel points in the initial image which are vertical to the first direction, the abscissa of the second gray value curve represents the pixel point in the initial image along the second direction, the ordinate represents the average gray value of each row of pixel points in the initial image which are vertical to the second direction, and the first direction is vertical to the second direction; according to the gray value curve, positioning of the test card calculation area is achieved, and accuracy of positioning of the test card calculation area is improved.
Description
Technical Field
The application belongs to the technical field of reagent detection, and particularly relates to a positioning method, device and terminal equipment for a test card calculation area.
Background
Immunochromatography is a rapid immunoassay technique which achieves the purpose of detection by an antigen-antibody binding reaction occurring in the chromatographic process. In immunochromatographic detection, analysis and testing by obtaining an image of a chromatographic test card is a common method.
At present, in the process of image analysis of a test card, a calculation area of the test card is preset in software by manpower, and in the preset calculation area, the detection result judgment is performed by comparing the gray values of a quality control line (C line) and a test line (T line) of a test strip. However, in the actual operation process, the preset calculation area is often not completely overlapped with the actual calculation area of the test card due to the assembly error of the test card, so that the problem that the C line and the T line cannot be accurately calculated is caused, and the accuracy of the detection result is lower.
Therefore, how to improve the accuracy of immunochromatographic detection is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a positioning method, a positioning device and terminal equipment for a test card calculation area, which improve the accuracy of positioning the test card calculation area and improve the accuracy of a detection result.
In a first aspect, an embodiment of the present application provides a method for positioning a computing area of a test card, where the test card includes a plurality of card slots, and the card slots are used for placing test strips, and the method includes: acquiring an initial image of the test card; calculating the gray value of each pixel point in the initial image; generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel point along a first direction in the initial image, the ordinate represents the average gray value of each row of pixel points perpendicular to the first direction in the initial image, the abscissa of the second gray value curve represents the pixel point along a second direction in the initial image, and the ordinate represents the average gray value of each row of pixel points perpendicular to the second direction in the initial image, and the first direction is perpendicular to the second direction; and positioning the test card calculation area in the initial image according to the gray value curve.
In one possible implementation, the positioning the test card calculation area in the initial image according to the gray value curve includes: positioning a result display area of the test card in the initial image according to the gray value curve; positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card; and positioning the test card calculation area in the test strip area according to a preset pixel value.
In one possible implementation manner, the positioning the result display area of the test card in the initial image according to the gray value curve includes: acquiring a preset range of the result display area in the initial image; according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along the first direction in the preset range as a first starting point and a first ending point; according to the second gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along the second direction in the preset range as a second starting point and a second ending point; and positioning the result display area according to the first starting point, the first end point, the second starting point and the second end point.
In one possible implementation manner, the positioning the test strip area of the test card in the result display area according to the gray value curve and the number of the card slots of the test card includes: according to the number of the clamping grooves, carrying out average segmentation on the result display area along the first direction to obtain a plurality of segmentation areas, wherein the number of the segmentation areas is equal to the number of the clamping grooves, and each segmentation area in the plurality of segmentation areas comprises a clamping groove; according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points of each segmentation area along the first direction as a third starting point and a third ending point of each segmentation area; and positioning the test strip area of the test card according to the second starting point, the second ending point and the third starting point and the third ending point of each segmentation area.
In one possible implementation manner, the positioning the test card calculation area in the test strip area according to the preset pixel value includes: and contracting the test strip area along the first direction by a first preset pixel value at the center, and contracting the test strip area along the second direction by a second preset pixel value at the center to obtain the test card calculation area.
In one possible implementation, before locating the result presentation area of the test card in the initial image according to the gray value curve, the method further comprises: positioning a region of interest of the test card in the initial image according to the gray value curve; correspondingly, the positioning the result display area of the test card in the initial image according to the gray value curve comprises the following steps: and positioning a result display area of the test card in the region of interest according to the gray value curve.
In a possible implementation manner, the positioning the region of interest of the test card in the initial image according to the gray value curve includes: scanning the two ends of the first gray value curve towards the center, and respectively determining a first pixel point which is smaller than a first preset gray value at the two ends as a fourth starting point and a fourth end point; scanning the two ends of the second gray value curve towards the center, and respectively determining a first pixel point which is smaller than a second preset gray value at the two ends as a fifth starting point and a fifth end point; and positioning the region of interest according to the fourth starting point, the fourth ending point, the fifth starting point and the fifth ending point.
In a second aspect, embodiments of the present application provide a positioning device for a computing area of a test card, where the test card includes a plurality of card slots, and the card slots are used for placing test strips, and the device includes: the acquisition module is used for acquiring an initial image of the test card; the calculation module is used for calculating the gray value of each pixel point in the initial image; the processing module is used for generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel points in the initial image along a first direction, the ordinate represents the average gray value of each row of pixel points in the initial image which are perpendicular to the first direction, the abscissa of the second gray value curve represents the pixel points in the initial image along a second direction, and the ordinate represents the average gray value of each row of pixel points in the initial image which are perpendicular to the second direction, and the first direction is perpendicular to the second direction; and the positioning module is used for positioning the test card calculation area in the initial image according to the gray value curve.
In a third aspect, an embodiment of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method according to the first aspect or any implementation manner of the first aspect when executing the computer program.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method according to the first aspect or any one of the implementations.
In a fifth aspect, embodiments of the present application provide a computer program product, which when run on a terminal device, causes the terminal device to perform the method according to the first aspect or any implementation manner of the first aspect.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the positioning of the calculation area of the test card is realized through the characteristic information of the test card and the gray value curve generated according to the gray value of each pixel point in the initial image of the test card, the preset calculation area is not needed, the situation that the preset calculation area is not matched with the actual calculation area of the test card is effectively avoided, the accuracy of positioning the calculation area of the test card is improved, and meanwhile, the accuracy of a detection result is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test card according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a test card image according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for positioning a computing area of a test card according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a coordinate system of an initial image according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a first gray value curve according to an embodiment of the present disclosure;
FIG. 6 is a diagram illustrating a second gray scale curve according to an embodiment of the present disclosure;
FIG. 7 is a flowchart of an implementation manner of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application;
FIG. 8 is a flowchart of another implementation of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application;
FIG. 9 is a flowchart of another implementation of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application;
FIG. 10 is a block diagram of a positioning device for a test card computing area according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to positioning" or "in response to detection" depending on the context. Similarly, the phrase "if located" or "if [ a described condition or event ] is detected" may be interpreted in the context of meaning "upon locating" or "in response to locating" or "upon detecting [ a described condition or event ]" or "in response to detecting [ a described condition or event ]".
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
The technical scheme provided by the application is suitable for detection methods with specific area color change such as chromatography, chip, detection array, enzyme-linked immunosorbent assay and the like by using an immunoassay, and is also suitable for detection methods with specific area color change such as chromatography, chip, detection array and the like by physicochemical reaction of a non-immunoassay, and the application scope of the technical scheme is not limited.
For easy understanding, the technical solutions of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a test card according to an embodiment of the present application. As shown in fig. 1, the test card 100 includes a plurality of slots, namely, slot 1 and slot 2 …, and slot 1 and slot 2 …, respectively, slot N, which are parallel to each other.
The test strip comprises a quality control line (C line) and at least one test line (T line), and when the test strip is used for detection, the detection result is judged by comparing the gray values of the C line and the T line in the test strip.
As an example, the test card 100 further includes a one-dimensional code or a two-dimensional code, and the one-dimensional code or the two-dimensional code can implement functions of tracing the source, reading the content, and the like of the test card 100. And in the process of reading the one-dimensional code or the two-dimensional code, the specific coordinate position of the one-dimensional code or the two-dimensional code can be known.
It will be appreciated that the test card shown in fig. 1 is merely an example, and that in other embodiments of the present application, test card 100 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components, e.g., different numbers (one or more) of card slots may be included in the test card, and the locations of the card slots in the test card may be different, which is not limiting in this application.
Fig. 2 is a schematic diagram of a test card image according to an embodiment of the present application. As shown in fig. 2, the test card image 200 includes an initial image 210 of the test card, a region of interest 220, a result presentation region 230, 4 test strip regions 240, and 4 calculation regions 250.
As an example, an initial image 210 of the test card is captured by a camera in the test device; the region of interest 220, the results presentation area 230, the test strip area 240, and the calculation area 250 may be located on the basis of the initial image 210 by the methods shown in fig. 3 to 9.
It will be appreciated that the region of interest, the result display region, the test strip region, and the calculation region of the test card shown in fig. 2 are only examples, and for example, the region of interest 220 may completely coincide with the test card, or may be slightly larger or slightly smaller than the test card; in other embodiments of the present application, the test card image 200 may include a plurality of regions of interest, a plurality of result display regions, a plurality of test strip regions, and a plurality of calculation regions, which are not limited in this application.
Fig. 3 is a flowchart of a method for positioning a computing area of a test card according to an embodiment of the present application. As shown in fig. 3, the method includes at least S310 to S340. The method is performed by a detection device including, but not limited to, an immunochromatographic detection device, an enzyme-linked immunosorbent assay device.
S310, acquiring an initial image of the test card.
In one possible implementation, the initial image of the test card may be captured by a camera in the test device.
As an example, the initial image of the test card in the present embodiment may be the initial image 210 in fig. 2.
S320, calculating the gray value of each pixel point in the initial image.
In one possible implementation manner, the original gray value of each pixel in the initial image is calculated according to a gray value calculation method in the prior art, and then the original gray value of each pixel in the initial image is processed to obtain the gray value of each pixel, and the processing method for processing the original gray value of each pixel in the initial image includes one or more of denoising, smoothing and reversing.
Note that, the processing method of the original gray value is not limited in this embodiment.
S330, generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel point along the first direction in the initial image, the ordinate represents the average gray value of each row of pixel points perpendicular to the first direction in the initial image, the abscissa of the second gray value curve represents the pixel point along the second direction in the initial image, the ordinate represents the average gray value of each row of pixel points perpendicular to the second direction in the initial image, and the first direction is perpendicular to the second direction.
Specifically, the gradation value curve is a curve obtained by adding and averaging gradation values of pixels distributed perpendicularly to the axial direction in the axial direction.
In one possible implementation, a coordinate system as shown in fig. 4 is established for the acquired initial image of the test card, and an x-axis direction is taken as a first direction and a y-axis direction is taken as a second direction, where the x-axis direction is a direction perpendicular to the card slot in the test card, the y-axis is a direction parallel to the card slot in the test card, and the x-axis is perpendicular to the y-axis.
As an example, based on the coordinate system shown in fig. 4, scanning is performed along the x-axis, and the gray values of each column of pixel points perpendicular to the x-axis direction are added and averaged, resulting in a first gray value curve as shown in fig. 5.
As an example, based on the coordinate system shown in fig. 4, scanning is performed along the y-axis, and the gray values of each row of pixel points perpendicular to the y-axis direction are added and averaged, resulting in a second gray value curve as shown in fig. 6.
S340, positioning the test card calculation area in the initial image according to the gray value curve.
Specifically, the calculation area is an area for calculating a detection result in the initial image, and the test card calculation area can be positioned in the initial image according to the generated gray value curve.
Illustratively, the test results include negative, weak positive, and positive.
In one possible implementation, when the color of the test card tray in the detection device is the same as the color of the test card, firstly positioning a result display area of the test card in the initial image according to the generated gray value curve; positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card; and finally, positioning a test card calculation area in the test strip area according to the preset pixel value.
In another possible implementation, when the color of the test card tray in the detection device is different from the color of the test card, firstly, locating the region of interest of the test card in the initial image according to the gray value curve; positioning a result display area of the test card in the initial image according to the gray value curve; positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card; and finally, positioning a test card calculation area in the test strip area according to the preset pixel value.
In yet another possible implementation, when the color of the test card tray in the detection device is different from the color of the test card and the test card has a two-dimensional code, first, according to the gray value curve, locating a first region of interest of the test card in the initial image; removing the two-dimensional code from the first region of interest according to the position coordinates and the region range of the two-dimensional code to obtain a second region of interest; positioning a result display area of the test card in the second interested area according to the gray value curve; positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card; and finally, positioning a test card calculation area in the test strip area according to the preset pixel value.
As an example, fig. 7 is a flowchart of an implementation manner of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application. As shown in fig. 7, this implementation includes at least S3401 to S3403. The method shown in fig. 7 is applicable to a scenario in which the color of the test card tray in the test apparatus is the same as the color of the test card.
S3401, positioning a result display area of the test card in the initial image according to the gray value curve.
Specifically, in this embodiment, an area including a test strip in a test card obtained by removing the background according to the gray value curve on the basis of the initial image is taken as a result display area. One example of a results display area is the results display area 230 in fig. 2.
In one possible implementation, a preset range of the result display area is obtained; according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along a first direction in a preset range as a first starting point and a first end point; according to the second gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along the second direction in a preset range as a second starting point and a second end point; and positioning the result display area according to the first starting point, the first end point, the second starting point and the second end point.
As an example, scanning toward the center along both ends of a first gray value curve, determining 2 pixel points having the highest gray value in a preset range as a first start point and a first end point, respectively; scanning towards the center along two ends of a second gray value curve, respectively determining 2 pixel points with highest gray values in a preset range as a second starting point and a second end point, and connecting the first starting point, the first end point, the second end point and the second starting point to obtain a result display area.
The preset range is illustratively within 3/4 of the area centered on the x-axis and 1/2 of the area down along the y-axis.
Exemplary, the first starting point is determined to have a coordinate of Xs 1 =145, the first endpoint has the coordinates Xe 1 =1010, the coordinates of the second starting point is Ys 1 =990, the coordinates of the second endpoint are Ye 1 =1410。
It should be noted that the preset range is within the 3/4 area range centered on the x-axis, and within the 1/2 area range downward along the y-axis is only an example, and the preset range may be set in a customized manner according to relevant features of the test card, where relevant features of the test card include, but are not limited to, the number of card slots in the test card, the approximate coordinate ranges of the vertices of 4 of each card slot, and the like, which are not limited in this application.
S3402, positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card.
Specifically, in this embodiment, on the basis of the result display area, a specific distribution area of each test strip in the test card obtained by further removing the background according to the gray value curve and the number of slots in the test card is used as a test strip area. One example of a test strip area is test strip area 240 in fig. 2.
In one possible implementation manner, according to the number of the clamping grooves, the result display area is divided evenly along the first direction to obtain a plurality of dividing areas, the number of the dividing areas is equal to the number of the clamping grooves, and each dividing area in the plurality of dividing areas comprises one clamping groove; according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points of each segmentation area along the first direction as a third starting point and a third end point of each segmentation area; and positioning the test strip area of the test card according to the second starting point, the second end point and the third starting point and the third end point of each segmentation area.
As an example, if the number of the clamping grooves in the test card is 4, the result display area is divided into 4 divided areas on average along the x-axis direction in the initial image, 2 gray value peak points are found in each divided area of the 4 divided areas according to the first gray value curve, pixel points corresponding to the 2 gray value peak points in each divided area are respectively determined as a third starting point and a third end point of each divided area, the third starting point and the third end point of each divided area are the starting point and the end point of the test strip area in the x-axis direction in the divided area, the starting point and the end point of the test strip area in the y-axis direction are consistent with the result display area, namely the second starting point and the second end point, and the second starting point, the second end point, the third end point and the third starting point in each divided area are connected to obtain 4 test strip areas of the test card.
For example, the coordinates of the third starting point in the first cut area are x1=210, the coordinates of the third ending point are x2=282, the coordinates of the third starting point in the second cut area are x3=426, the coordinates of the third ending point are x4=509, the coordinates of the third starting point in the third cut area are x5=664, the coordinates of the third ending point are x6=737, the coordinates of the third starting point in the fourth cut area are x7=875, and the coordinates of the third ending point are x8=955.
S3403, positioning a test card calculation area in the test strip area according to the preset pixel value.
Specifically, in this embodiment, an area for performing detection result calculation, which is obtained by further removing the background according to the preset pixel value on the basis of the test strip area, is taken as a calculation area. One example of a calculation area is the test card calculation area 250 in fig. 2.
In one possible implementation, the test strip region is shrunk by a first preset pixel value toward the center along a first direction, and is shrunk by a second preset pixel value toward the center along a second direction, so as to obtain a test card calculation region.
As an example, the first preset pixel value and the second preset pixel value are both 20 pixels, each of the obtained 4 test strip regions is shrunk by 20 pixels toward the center along the x-axis direction of the initial image, and each of the obtained 4 test strip regions is shrunk by 20 pixels toward the center along the y-axis direction of the initial image, so as to obtain 4 test card calculation regions.
It should be noted that, the first preset pixel value and the second preset pixel value are both 20 pixels and are only examples, the first preset pixel value and the second preset pixel value are related to parameters of a camera in the detection device, feature information of a test card, a test strip size, and the like, and the first preset pixel value and the second preset pixel value under different conditions are different, which is not limited in this embodiment.
In one possible implementation, the detection result is obtained by calculating according to the test card calculation area and the existing test strip result determination method.
As an example, the region where the C line is located and the region where the T line is located are identified in the test card calculation region, the average value of the gray values corresponding to the plurality of pixels in the region where the C line is located and the average value of the gray values corresponding to the plurality of pixels in the region where the T line is located are calculated according to the gray values of the plurality of pixels in the region where the C line is located and the region where the T line is located, the gray average value of the region where the C line is located and the gray average value of the region where the T line is located are obtained, the ratio of the gray average value of the region where the C line is located and the gray average value of the region where the T line is located is calculated, the detection result is determined according to the ratio, and the detection result is positive, weak positive and negative.
For example, when the ratio is less than or equal to the first preset threshold, the detection result is negative; when the ratio is larger than a first preset threshold value and smaller than or equal to a second preset threshold value, the detection result is weak positive; and when the ratio is larger than a second preset threshold value, the detection result is positive.
It should be noted that, the first preset threshold value and the second preset threshold value are set according to actual needs, which is not limited in this application.
According to the technical scheme provided by the embodiment, the positioning of the calculation area of the test card is realized through the characteristic information of the test card and the gray value curve generated according to the gray value of each pixel point in the initial image of the test card, the calculation area is not required to be preset, the situation that the preset calculation area is not matched with the actual calculation area of the test card in the prior art is effectively avoided, the accuracy of positioning the calculation area of the test card is improved, and meanwhile, the accuracy of a detection result is improved.
As another example, fig. 8 is a flowchart of another implementation manner of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application. As shown in fig. 8, this implementation includes at least S3411 to S3414. The method shown in fig. 8 is suitable for a scenario in which a test card tray in a test apparatus is different from a test card.
S3411, positioning the region of interest of the test card in the initial image according to the gray value curve.
Specifically, in this embodiment, an area obtained by removing the interference background according to the gray value curve on the basis of the initial image is taken as an area of interest, and the area of interest includes a field of view area of the test card. One example of a region of interest is region of interest 220 in fig. 2.
In one possible implementation manner, scanning from two ends of the first gray value curve to the center, and determining the obtained pixel points with the first gray value smaller than the first preset gray value at the two ends as a fourth starting point and a fourth end point respectively; respectively determining a pixel point with a first gray value smaller than a second preset gray value at two ends obtained by scanning from two ends of the second gray value curve to the center as a fifth starting point and a fifth ending point; and positioning the region of interest according to the fourth starting point, the fourth ending point, the fifth starting point and the fifth ending point.
As an example, the first preset gray value and the second preset gray value are 70, scanning is performed from two ends of the first gray value curve to the center, and the pixel points with the first gray value smaller than 70 at the two ends are respectively determined as a fourth starting point and a fourth end point; scanning from two ends of the second gray value curve to the center, respectively determining pixel points with the first gray values smaller than 70 at the two ends as a fifth starting point and a fifth ending point, connecting the fourth starting point, the fourth ending point, the fifth ending point and the fifth starting point, and positioning the region of interest in the initial image.
The fourth starting point is exemplified by the coordinates of Xs 2 =30, the fourth endpoint has the coordinates Xe 2 =1110, the coordinates of the fifth starting point is Ys 2 =180, the fifth endpoint has coordinates Ye 2 =1500。
It should be noted that, the first preset gray value and the second preset gray value are 70 only one example, and the preset gray values are related to factors such as the camera parameters in the detection device and the color of the test card, which is not limited in this embodiment.
S3412, positioning a result display area of the test card in the region of interest according to the gray value curve.
Specifically, in this embodiment, an area including the test strip in the test card, which is obtained by removing the background according to the gray value curve on the basis of the region of interest, is taken as the result display area.
S3413, positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card.
S3414, positioning a test card calculation area in the test strip area according to the preset pixel value.
It should be noted that, specific implementation steps of S3412 to S3414 may refer to S3401 to S3403, and will not be described herein.
According to the technical scheme provided by the embodiment, the situation that the test card tray and the test card in the detection equipment are different in color is considered, the region of interest is determined in the initial image of the test card according to the gray value curve, the result display region of the test card and the calculated region of the test strip region are further determined on the basis of the region of interest, the accuracy of positioning the calculated region of the test card is improved, and meanwhile the accuracy of detection according to the test card is improved.
As yet another example, fig. 9 is a flowchart of another implementation manner of S340 in a method for positioning a computing area of a test card according to an embodiment of the present application. As shown in fig. 9, this implementation includes at least S3421 to S3426. The method shown in fig. 9 is suitable for testing the different colors of the test card tray and the test card in the equipment, and the test card has a two-dimensional code scene.
S3421, positioning a first region of interest of the test card in the initial image according to the gray value curve.
It should be noted that, in S3421, the specific implementation step of locating the first region of interest of the test card in the initial image according to the gray value may refer to the step of locating the region of interest of the test card in the initial image according to the gray value in S3411, which is not described herein.
S3422, acquiring the position coordinates and the area range of the two-dimensional code in the test card.
In one possible implementation, a two-dimensional code in a test card is scanned, and the position coordinates and the area range of the two-dimensional code are read.
As an example, the position coordinates of the two-dimensional code are the x-axis: x-axis 1/3 area, 400 pixels; y axis: y-axis 1/4 area, 450 pixels, area size H:400 pixels.
S3423, removing the two-dimensional code from the first region of interest according to the position coordinates and the region range of the two-dimensional code, and obtaining a second region of interest.
In one possible implementation, a removal range is determined according to the position coordinates and the area range of the two-dimensional code in the test card, and the two-dimensional code is removed from the first region of interest according to the removal range.
As an example, the removal area along the y-axis direction is the sum of the coordinates of the two-dimensional code in the y-axis and the area size, that is, 850 pixels (450 pixels+400 pixels). And performing background removal along the y axis according to the removal region to obtain a second region of interest.
S3424, positioning a result display area of the test card in the second interested area according to the gray value curve.
S3425, positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card.
S3426, positioning a test card calculation area in the test strip area according to the preset pixel value.
It should be noted that, specific implementation steps of S3424 to S3426 may refer to S3401 to S3403, and will not be described herein.
According to the technical scheme provided by the embodiment, the situation that the test card tray in the detection equipment is different from the test card is considered, the two-dimensional code is arranged in the test card, the first region of interest is determined in the initial image of the test card according to the gray value curve, the two-dimensional code is removed from the first region of interest according to the position coordinates and the region range of the two-dimensional code in the test card, the second region of interest is obtained, the result display region of the test card and the calculated region of the test strip region are further determined on the basis of the second region of interest, the accuracy of positioning the calculated region of the test card is improved, and meanwhile the accuracy of detecting the detection result of the test card according to the calculated region is improved.
Fig. 10 is a block diagram of a positioning device for a test card computing area according to an embodiment of the present application, and for convenience of explanation, only a portion related to the embodiment of the present application is shown. Referring to fig. 10, the positioning apparatus 1000 of the test card calculation area may include an acquisition module 1001, a calculation module 1002, a processing module 1003, and a positioning module 1004.
In one implementation, the apparatus 1000 may be used to implement the method illustrated in FIG. 3 described above. For example, the acquisition module 1001 is used to implement S310, the calculation module 1002 is used to implement S320, the processing module 1003 is used to implement S330, and the positioning module 1004 is used to implement S340.
In another possible implementation, the apparatus 1000 may be used to implement the method illustrated in fig. 7 described above. For example, the positioning module 1004 is used to implement S3401 to S3403.
In yet another possible implementation, the apparatus 1000 may be used to implement the method illustrated in fig. 8 described above. For example, the positioning module 1004 is used to implement S3411 to S3414.
In yet another possible implementation, the apparatus 1000 may be used to implement the method illustrated in fig. 9 described above. In this possible implementation, the apparatus 1000 further includes a removal module, for example, the acquisition module 1001 is used to implement S3422, the positioning module 1004 is used to implement S3421, S3424 to S3426, and the removal module is used to implement S3423.
According to the embodiment, the positioning of the calculation area of the test card is realized through the characteristic information of the test card and the gray value curve generated according to the gray value of each pixel point in the initial image of the test card, so that the accuracy of positioning the calculation area of the test card is improved, and the accuracy of a detection result is improved.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
Fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 11, the terminal device 11 of this embodiment includes: at least one processor 110 (only one shown in fig. 11), a memory 111, and a computer program 112 stored in the memory 111 and executable on the at least one processor 110, the processor 110 implementing the steps in any embodiment of the above-described method of locating a test card computing area when executing the computer program 112.
The terminal device 11 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor 110, a memory 111. It will be appreciated by those skilled in the art that fig. 11 is merely an example of the terminal device 11 and is not meant to be limiting as to the terminal device 11, and may include more or fewer components than shown, or may combine certain components, or may include different components, such as input-output devices, network access devices, etc.
The processor 110 may be a central processing unit (Central Processing Unit, CPU), the processor 110 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 111 may in some embodiments be an internal storage unit of the terminal device 11, such as a hard disk or a memory of the terminal device 11. The memory 111 may in other embodiments also be an external storage device of the terminal device 11, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal device 11. Further, the memory 111 may also include both an internal storage unit and an external storage device of the terminal device 11. The memory 111 is used to store an operating system, application programs, boot loader (BootLoader), data, and other programs, etc., such as program codes of the computer program. The memory 111 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
The embodiment of the application also provides a network device, which comprises: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, which when executed by the processor performs the steps of any of the various method embodiments described above.
Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements steps that may implement the various method embodiments described above.
Embodiments of the present application provide a computer program product which, when run on a mobile terminal, causes the mobile terminal to perform steps that may be performed in the various method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application implements all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing device/terminal apparatus, recording medium, computer Memory, read-Only Memory (ROM), random access Memory (RAM, random Access Memory), electrical carrier signals, telecommunications signals, and software distribution media. Such as a U-disk, removable hard disk, magnetic or optical disk, etc. In some jurisdictions, computer readable media may not be electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other manners. For example, the apparatus/network device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method for positioning a computing area of a test card, wherein the test card includes one or more card slots for receiving test strips, the method comprising:
acquiring an initial image of the test card;
Calculating the gray value of each pixel point in the initial image;
generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel point along a first direction in the initial image, the ordinate represents the average gray value of each row of pixel points perpendicular to the first direction in the initial image, the abscissa of the second gray value curve represents the pixel point along a second direction in the initial image, and the ordinate represents the average gray value of each row of pixel points perpendicular to the second direction in the initial image, and the first direction is perpendicular to the second direction;
and positioning the test card calculation area in the initial image according to the gray value curve.
2. The method of claim 1, wherein said locating the test card calculation area in the initial image according to the gray value curve comprises:
positioning a result display area of the test card in the initial image according to the gray value curve;
positioning a test strip area of the test card in the result display area according to the gray value curve and the number of the clamping grooves of the test card;
And positioning the test card calculation area in the test strip area according to a preset pixel value.
3. The method of claim 2, wherein said locating the result presentation area of the test card in the initial image according to the gray value curve comprises:
acquiring a preset range of the result display area in the initial image;
according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along the first direction in the preset range as a first starting point and a first ending point;
according to the second gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points along the second direction in the preset range as a second starting point and a second ending point;
and positioning the result display area according to the first starting point, the first end point, the second starting point and the second end point.
4. A method according to claim 3, wherein said locating a test strip area of said test card in said result presentation area according to said gray value curve and the number of card slots of said test card comprises:
According to the number of the clamping grooves, carrying out average segmentation on the result display area along the first direction to obtain a plurality of segmentation areas, wherein the number of the segmentation areas is equal to the number of the clamping grooves, and each segmentation area in the plurality of segmentation areas comprises a clamping groove;
according to the first gray value curve, respectively determining pixel points corresponding to 2 gray value peaks in a plurality of pixel points of each segmentation area along the first direction as a third starting point and a third ending point of each segmentation area;
and positioning the test strip area of the test card according to the second starting point, the second ending point and the third starting point and the third ending point of each segmentation area.
5. The method of claim 2, wherein locating the test card calculation region in the test strip region according to a preset pixel value comprises:
and contracting the test strip area along the first direction by a first preset pixel value at the center, and contracting the test strip area along the second direction by a second preset pixel value at the center to obtain the test card calculation area.
6. The method of claim 2, wherein prior to said locating the result presentation area of the test card in the initial image according to the gray value curve, the method further comprises:
Positioning a region of interest of the test card in the initial image according to the gray value curve;
correspondingly, the positioning the result display area of the test card in the initial image according to the gray value curve comprises the following steps:
and positioning a result display area of the test card in the region of interest according to the gray value curve.
7. The method of claim 6, wherein said locating a region of interest of the test card in the initial image according to the gray value curve comprises:
scanning the two ends of the first gray value curve towards the center, and respectively determining a first pixel point which is smaller than a first preset gray value at the two ends as a fourth starting point and a fourth end point;
scanning the two ends of the second gray value curve towards the center, and respectively determining a first pixel point which is smaller than a second preset gray value at the two ends as a fifth starting point and a fifth end point;
and positioning the region of interest according to the fourth starting point, the fourth ending point, the fifth starting point and the fifth ending point.
8. A positioning device for a test card computing area, the test card including one or more card slots for receiving test strips, the device comprising:
The acquisition module is used for acquiring an initial image of the test card;
the calculation module is used for calculating the gray value of each pixel point in the initial image;
the processing module is used for generating a gray value curve according to the gray value of each pixel point, wherein the gray value curve comprises a first gray value curve and a second gray value curve, the abscissa of the first gray value curve represents the pixel points in the initial image along a first direction, the ordinate represents the average gray value of each row of pixel points in the initial image which are perpendicular to the first direction, the abscissa of the second gray value curve represents the pixel points in the initial image along a second direction, and the ordinate represents the average gray value of each row of pixel points in the initial image which are perpendicular to the second direction, and the first direction is perpendicular to the second direction;
and the positioning module is used for positioning the test card calculation area in the initial image according to the gray value curve.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 7.
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