CN115359449A - Automatic identification method and system for turnout notch image of point switch - Google Patents
Automatic identification method and system for turnout notch image of point switch Download PDFInfo
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Abstract
The invention provides a method and a system for automatically identifying a switch machine turnout gap image, belonging to the technical field of switch machine gap image identification; the method comprises the following steps: acquiring historical images of a switch turnout notch of a switch machine to generate an image feature library; preprocessing the acquired current image and then comparing the preprocessed current image with an image feature library to obtain an area range image of the fixed and reverse position of the point switch; calculating the similarity between the region range image and the image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image; converting and searching line segments meeting preset conditions from the extracted result, determining the slopes and intercepts of all the line segments, and further determining the coordinates of the notch line; and identifying the notch image according to the notch line coordinates. Based on the method, an automatic identification system of the switch machine turnout notch image is also provided. According to the invention, the high-pixel camera is adopted to directly acquire the notch position image, and the feature library comparison and notch line extraction are carried out on the original image, so that the calculation accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of switch machine gap image recognition, and particularly relates to an automatic recognition method and system for a switch machine switch gap image.
Background
The point switch is an important signal basic device for reliably converting the position of the turnout, changing the opening direction of the turnout, locking a switch point rail and reflecting the position of the turnout, and can well ensure the driving safety, improve the transportation efficiency and improve the labor intensity of driving personnel. Types of switches include S700K, ZD6, ZY7 and ZD9.
The gap monitoring of the above four types of switches in the prior art mainly adopts the following modes: the first digital gap is monitored, a gap size value is provided for a client, and the client cannot visually check the current situation of the gap by the method. Secondly, directly extract the breach line characteristic in following the real-time image, this kind of mode receives external disturbance too big, for example the influence of light, greasy dirt, and the influence of non-breach image when skylight is repaiied, pulls the influence of mistake camera shooting mistake when too fast etc. and all leads to breach line recognition mistake easily. If the extraction of the notch line features is inaccurate, the extraction of the coordinates of the feature lines after the feature line extraction is also inaccurate. In the prior art, the method for determining the coordinates of the characteristic lines scans the moving local area of the notch line in the processing process of the notch image, and determines the maximum value and the minimum value according to the characteristics of the notch line after the scanning is finished, so as to determine the coordinates of the notch line. The method cannot be applied to line segments with all slopes, and is poor in applicability to field installation environments.
Disclosure of Invention
In order to solve the technical problems, the invention provides an automatic identification method and system for a turnout notch image of a point switch.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic identification method for a switch machine turnout notch image comprises the following steps:
acquiring a historical notch image of each point switch turnout, and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed and reverse positions of the point switch;
calculating the similarity between the area range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image;
transforming and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments, and further determining the coordinates of the notch line; and identifying the notch image according to the notch line coordinate.
Further, the notch image comprises a positioning notch image and an inverted notch image; the notch image feature library comprises a positioning notch image feature library and an inverted notch image feature library.
Further, the step of obtaining the area range image of the switch machine fixed reverse position by comparing the obtained current image of the switch machine turnout notch after being preprocessed with the notch image feature library comprises the following steps:
decomposing the obtained current image of the turnout gap of the point switch into r, g and b three-color images;
the brightness of the three-color image is balanced, and then a second notch image is synthesized again;
and comparing the second notch image with a notch image feature library to obtain an area range image where the notch is located, and cutting the area range image.
Further, the method for calculating the similarity between the region range image and the notch image feature library comprises the following steps:
wherein the content of the first and second substances,
representing pixel points of the segmentation blocks in the notch image feature library;
pixel points of segmentation blocks in the image of the area range are represented;
Further, the process of denoising the region-range image comprises:
increasing the contrast of the region range image, and then removing small noise points by adopting a median filtering mode; and converting the region range image with the small noise points removed into a gray level image.
Further, the process of adding contrast to the region-wide image includes:
by using
Recalculating the current pixel coordinates;
wherein
Is the current pixel coordinate;
coordinates to the left of the current pixel coordinates;
coordinates to the right of the current pixel coordinates;
coordinates in front of the current pixel coordinates;
as the coordinates behind the current pixel coordinates.
Further, the process of extracting the notch edge includes: and traversing the monitoring blocks with preset odd numbers, and adopting self-adaptive threshold binarization to calculate the maximum notch line characteristic point.
Further, the detailed process of calculating the maximum notch line feature point by using adaptive threshold binarization includes:
respectively monitoring the characteristics of the notch lines by adjusting the size of the monitoring block; the size range of the monitoring blocks is [3,31] and is odd;
after the size of the monitoring block is changed every time, the coordinates of the straight boundary line in the binarization result and the number of points which meet the conditions in the straight boundary line are obtained;
after traversing all monitoring blocks, solving a maximum point; if the maximum point number in the Y direction is larger than the threshold value of the gap searching range, the gap searching is successful.
Further, the process of transforming and searching for a line segment meeting the preset condition from the result extracted from the notch edge, determining the slope and intercept of all the line segments, and further determining the notch line coordinate comprises the following steps:
transforming and searching line segments meeting preset conditions from the extracted result of the notch edge according to Hough transformation; the preset conditions are as follows: the radius step length is 1, and the angle step length is pi/180 of all line segments;
the slope and intercept of all line segments are given as y = kx + b; wherein k is the slope and b is the intercept;
finding out the line segment with the longest line segment and the largest absolute value of slope from all the line segments;
and substituting the y coordinate value of the central point of the notch searching range into a formula y = kx + b, and solving the value of x, namely the coordinate of the notch line.
The invention also provides an automatic identification system of the switch machine turnout notch image, which comprises a comparison module, an extraction module and a determination module;
the comparison module is used for acquiring historical images of a turnout notch of each point switch and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch;
the extraction module is used for calculating the similarity between the region range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image;
the determining module is used for converting and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments and further determining the coordinates of the notch line; and identifying the notch image type according to the notch line coordinate.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
the invention provides a method and a system for automatically identifying a switch machine turnout notch image, wherein the method comprises the following steps: acquiring a historical notch image of each point switch turnout, and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch; calculating the similarity between the area range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image; transforming and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments, and further determining the coordinates of the notch line; and identifying the notch image according to the notch line coordinate. Based on an automatic identification method of a switch machine turnout gap image, an automatic identification system of the switch machine turnout gap image is also provided. The invention does not need to modify the point switch; the high-pixel camera is adopted to directly collect the notch position image, the feature library comparison and notch line extraction are carried out on the original image, the feature library comparison mode is adopted to determine whether the image is a positioning image or a reversed image, then the notch line extraction is carried out, and the calculation accuracy is greatly improved.
The proportion of the notch line in the whole image is less, and only the local area of the notch line is processed in the processing process of the notch image, so that the calculation time is greatly saved, and the working efficiency of the whole system is improved.
According to Hough transformation, all possible line segments meeting preset conditions are searched in the edge extraction result; and finding out the line segment with the longest line segment and the largest absolute value of the slope from all the line segments. The invention can adapt to line segments with all slopes and can be more suitable for the field installation environment.
Drawings
Fig. 1 is a flow chart of an automatic identification method for a switch machine turnout gap image in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a pixel point before median filtering in embodiment 1 of the present invention;
fig. 3 is a schematic diagram of pixel points after median filtering in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of an image after binarization according to embodiment 1 of the invention;
FIG. 5 is a schematic diagram of all line segments in embodiment 1 of the present invention;
fig. 6 is a schematic diagram of an automatic identification system for a switch machine switch gap image according to embodiment 2 of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the present invention will be explained in detail by the following embodiments and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Example 1
The embodiment 1 of the invention provides an automatic identification method of a point switch notch image of a point switch. Respectively extracting the feature points of the notch image according to the type of the switch machine to generate a notch feature library of the switch machine of the type, verifying whether the image received at the future time has a notch or not by adopting the generated feature library, and finding an edge coordinate by an edge extraction method if the image has the notch, so that the accuracy of notch calculation is greatly improved.
The S700K point switch uses one camera to shoot the notches in two directions, wherein the notches may be an upper notch or a lower notch; ZD6, ZD9, ZY7 switch machine use two cameras to shoot the breach of two directions, one of them is the breach image, and another is the node image, and in the in-process that the switch machine overhauld, the image that the camera was shot is various, and the probability of simple edge monitoring algorithm miscalculation is great. The algorithm respectively extracts the feature points of the notch images according to the types of the point switches to generate notch feature libraries of the point switches of the types, the generated feature libraries are adopted to verify whether the images received at the future time have notches, if so, the edge coordinates are found by an edge extraction method, and the accuracy of notch calculation is greatly improved.
The specific process comprises the following steps: acquiring a historical notch image of each point switch turnout, and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch; calculating the similarity between the area range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image; transforming and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments, and further determining the coordinates of the notch line; and identifying the notch image according to the notch line coordinates.
Fig. 1 is a flowchart of an automatic identification method for a switch machine switch gap image according to embodiment 1 of the present invention.
In step S101, a notch image feature library is generated by obtaining a historical notch image of each switch point; the notch image comprises a positioning notch image and an inverted notch image; the notch image feature library comprises a positioning notch image feature library and an inverted notch image feature library.
In step S102, the obtained current image of the switch machine turnout notch is preprocessed and then compared with the notch image feature library to obtain an area range image of the switch machine fixed-reverse position.
Firstly, decomposing an obtained current image of a point switch notch of a point switch into r, g and b three-color images;
the brightness of the three-color image is balanced, and then a second notch image is synthesized again;
and comparing the second notch image with a notch image feature library to obtain an area range image of the notch, and cutting the area range image. Firstly, the brightness of a feature library image and the brightness of a current image are solved, and the brightness of the current image is adjusted by taking the brightness of the feature library image as a reference; the range of the gap is obtained through comparison with the feature library, and the occupation proportion of the gap in the image is improved through cutting.
In step S103, comparing the similarity of the cut images by using a TM _ SQDIFF _ NORMED method, and performing the next operation if the similarity meets the condition;
the method for calculating the similarity between the area range image and the notch image feature library comprises the following steps:
wherein, the first and the second end of the pipe are connected with each other,
pixel points of the segmentation blocks in the notch image feature library are represented;
pixel points of segmentation blocks in the image of the area range are represented;
In step S104, under the condition that the similarity is established, performing noise reduction processing on the area range image, and then performing notch edge extraction;
the process of the noise reduction processing comprises the following steps: increasing the contrast of the region range image, and then removing small noise points by adopting a median filtering mode; and converting the region range image with the small noise points removed into a gray level image.
The process of adding contrast to the region-wide image includes:
by using
Recalculating the current pixel coordinates;
wherein
Is the current pixel coordinate;
as a current imageCoordinates to the left of the prime coordinates;
the coordinates on the right side of the current pixel coordinates;
coordinates in front of the current pixel coordinates;
as the coordinates behind the current pixel coordinates.
The purpose of this calculation is: so that the bright parts of the image are brighter and the dark parts are darker, thereby increasing the contrast of the image.
The process of removing small noise by median filtering is as follows: and (3) taking the pixel values of the current pixel point and the adjacent pixel points (the total odd number of pixel points) around the current pixel point, sequencing the pixel values, and then taking the pixel value in the middle position as the pixel value of the current pixel point.
Fig. 2 is a schematic diagram of a pixel point before median filtering in embodiment 1 of the present invention; the neighborhood is set to be 3 multiplied by 3, the pixel values of the pixel points in the 3 multiplied by 3 neighborhood are sorted (ascending order), and the sequence value obtained after sorting according to the ascending order is as follows: [66,78,90,91,93,94,95,97,101]. In this sequence, the value at the center position is "93", and therefore the original pixel value 78 is replaced with this value as the new pixel value of the current point, resulting in a filtered pixel image. Fig. 3 is a schematic diagram of pixel points after median filtering in embodiment 1 of the present invention.
And after converting the area range image without the small noise points into a gray level image, performing binarization by adopting an adaptive threshold value, traversing the monitoring blocks with preset odd numbers, and performing binarization by adopting the adaptive threshold value to obtain the maximum notch line characteristic points.
The detailed process of solving the maximum notch line characteristic point by adopting self-adaptive threshold value binarization comprises the following steps:
respectively monitoring the characteristics of the notch lines by adjusting the size of the monitoring block; the size range of the monitoring blocks is [3,31] and is odd;
after the size of the monitoring block is changed every time, the coordinates of the straight boundary line in the binarization result and the number of points which meet the conditions in the straight boundary line are obtained;
after traversing all monitoring blocks, solving a maximum point; if the maximum point number in the Y direction is larger than the threshold value of the gap searching range, the gap searching is successful. Fig. 4 is a schematic diagram of an image after binarization in embodiment 1 of the invention.
In step S105, a line segment meeting a preset condition is searched for in a transformation manner from the result extracted from the edge of the notch, the slope and intercept of all the line segments are determined, and further the coordinates of the notch line are determined; and identifying the notch image according to the notch line coordinates.
Searching all possible line segments with radius step length of 1 and angle step length of pi/180 according to Hough transformation in the edge extraction result; FIG. 5 is a schematic diagram of all line segments in embodiment 1 of the present invention;
calculating the slope and intercept y = kx + b of all line segments;
and finding out the line segment with the longest line segment and the largest absolute value of the slope from all the line segments. The method can adapt to line segments with all slopes and can be more suitable for the field installation environment.
And substituting the y coordinate value of the central point of the notch searching range into a formula y = kx + b, and solving the value of x, namely the coordinate of the notch line.
And identifying the notch image according to the notch line coordinates.
The method for automatically identifying the turnout notch image of the point switch provided by the embodiment 1 of the invention does not need to modify the point switch; the high-pixel camera is adopted to directly collect the notch position image, the feature library comparison and notch line extraction are carried out on the original image, the feature library comparison mode is adopted to determine whether the image is a positioning image or a reversed image, then the notch line extraction is carried out, and the calculation accuracy is greatly improved.
In the method for automatically identifying the switch machine turnout notch image provided by the embodiment 1 of the invention, the occupied proportion of the notch line in the whole image is relatively small, and only the local area of the notch line is processed in the processing process of the notch image, so that the calculation time is greatly saved, and the working efficiency of the whole system is improved.
According to the method for automatically identifying the turnout notch image of the point switch, provided by the embodiment 1 of the invention, all possible line segments meeting the preset conditions are searched in the edge extraction result according to Hough transformation; and finding out the line segment with the longest line segment and the largest absolute value of the slope from all the line segments. The invention can adapt to line segments with all slopes and can be more suitable for the field installation environment.
Example 2
Based on the method for automatically identifying the switch machine turnout notch image provided by the embodiment 1 of the invention, an automatic identification system of the switch machine turnout notch image is also provided, for example, fig. 6 is a schematic diagram of the automatic identification system of the switch machine turnout notch image provided by the embodiment 2 of the invention, and the system comprises a comparison module, an extraction module and a determination module;
the comparison module is used for acquiring historical images of the turnout notch of each switch machine and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch;
the extraction module is used for calculating the similarity between the area range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image;
the determining module is used for converting and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments and further determining the coordinates of the notch line; and identifying the type of the notch image according to the notch line coordinates.
The detailed process realized by the comparison module is as follows: acquiring historical notch images of each point switch to generate a notch image feature library; the notch image comprises a positioning notch image and an inverted notch image; the notch image feature library comprises a positioning notch image feature library and an inverted notch image feature library;
firstly, decomposing an obtained current image of a point switch notch of a point switch into r, g and b three-color images;
the brightness of the three-color image is balanced, and then a second notch image is synthesized again;
and comparing the second notch image with the notch image feature library to obtain an area range image where the notch is located, and cutting the area range image. Firstly, the brightness of a feature library image and the brightness of a current image are solved, and the brightness of the current image is adjusted by taking the brightness of the feature library image as a reference; the range of the gap is obtained through comparison with the feature library, and the occupation proportion of the gap in the image is improved through cutting.
The detailed process realized by the extraction module comprises the following steps: comparing the similarity of the cut images by using a TM _ SQDIFF _ NORMED method, and performing the next operation according with the conditions;
the method for calculating the similarity between the area range image and the notch image feature library comprises the following steps:
wherein the content of the first and second substances,
representing pixel points of the segmentation blocks in the notch image feature library;
representing pixel points of the segmentation blocks in the region range image;
Under the condition that the similarity is established, performing notch edge extraction after the noise reduction processing on the region range image;
the process of the noise reduction processing comprises the following steps: increasing contrast ratio of the region range image, and then removing small noise points by adopting a median filtering mode; and converting the region range image with the small noise points removed into a gray level image.
The process of adding contrast to the region-wide image includes:
by using
Recalculating the current pixel coordinates;
wherein
Is the current pixel coordinate;
coordinates to the left of the current pixel coordinates;
the coordinates on the right side of the current pixel coordinates;
coordinates in front of the current pixel coordinates;
as the coordinates behind the current pixel coordinates.
The purpose of this calculation is: so that the bright parts in the image are brighter and the dark parts are darker, thereby increasing the contrast of the image.
The process of removing small noise points by median filtering is as follows: the pixel values of the current pixel point and the adjacent pixel points around the current pixel point (the total number of the odd pixel points) are taken, the pixel values are sequenced, and then the pixel value in the middle position is taken as the pixel value of the current pixel point.
Fig. 2 is a schematic diagram of a pixel point before median filtering in embodiment 1 of the present invention; the neighborhood is set to be 3 multiplied by 3, the pixel values of the pixel points in the 3 multiplied by 3 neighborhood are sorted (ascending order), and the sequence value obtained after sorting according to the ascending order is as follows: [66,78,90,91,93,94,95,97,101]. In this sequence, the value at the center position is "93", and therefore the original pixel value 78 is replaced with this value as the new pixel value of the current point, resulting in a filtered pixel image. Fig. 3 is a schematic diagram of pixel points after median filtering in embodiment 1 of the present invention.
And after converting the area range image without the small noise points into a gray level image, performing binarization by adopting an adaptive threshold value, traversing the monitoring blocks with preset odd numbers, and performing binarization by adopting the adaptive threshold value to obtain the maximum notch line characteristic points.
The detailed process of solving the maximum notch line characteristic point by adopting self-adaptive threshold binarization comprises the following steps:
respectively monitoring the characteristics of the notch lines by adjusting the size of the monitoring block; the size range of the monitoring blocks is [3,31] and is odd;
after the size of the monitoring block is changed every time, the coordinates of the straight boundary line in the binarization result and the number of points which meet the conditions in the straight boundary line are obtained;
after traversing all monitoring blocks, solving a maximum point; if the maximum point number in the Y direction is larger than the threshold value of the gap searching range, the gap searching is successful. Fig. 4 is a schematic diagram of an image after binarization in embodiment 1 of the invention.
The process realized by the comparison module comprises the following steps: searching all possible line segments with radius step length of 1 and angle step length of pi/180 according to Hough transformation in the edge extraction result; FIG. 5 is a schematic diagram of all line segments in embodiment 1 of the present invention;
calculating the slope and intercept y = kx + b of all line segments;
and finding out the line segment with the longest line segment and the largest absolute value of the slope from all the line segments. The method can adapt to line segments with all slopes and can be more suitable for the field installation environment.
And substituting the y coordinate value of the central point of the notch searching range into a formula y = kx + b, and solving the value of x, namely the coordinate of the notch line.
And identifying the notch image according to the notch line coordinates.
The automatic identification system for the turnout notch image of the point switch provided by the embodiment 2 of the invention does not need to modify the point switch; the high-pixel camera is adopted to directly collect the notch position image, the feature library comparison and notch line extraction are carried out on the original image, the feature library comparison mode is adopted to determine whether the image is a positioning image or a reversed image, then the notch line extraction is carried out, and the calculation accuracy is greatly improved.
In the automatic identification system for the switch machine turnout notch image provided by the embodiment 2 of the invention, the proportion of the notch line in the whole image is relatively small, and only the local area of the notch line is processed in the processing process of the notch image, so that the calculation time is greatly saved, and the working efficiency of the whole system is improved.
In the automatic identification system for the switch machine turnout notch image provided by the embodiment 2 of the invention, all possible line segments meeting the preset conditions are searched in the edge extraction result according to Hough transformation; and finding out the line segment with the longest line segment and the largest absolute value of the slope from all the line segments. The invention can adapt to line segments with all slopes and can be more suitable for the field installation environment.
For a description of a relevant part in the automatic identification system for a switch machine switch gap image provided in the embodiment of the present application, reference may be made to a detailed description of a corresponding part in the automatic identification method for a switch machine switch gap image provided in the embodiment 1 of the present application, and details are not repeated here.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
Although the specific embodiments of the present invention have been described with reference to the accompanying drawings, the scope of the present invention is not limited thereto. Various modifications and alterations will occur to those skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. On the basis of the technical scheme of the invention, various modifications or changes which can be made by a person skilled in the art without creative efforts are still within the protection scope of the invention.
Claims (10)
1. An automatic identification method for a point switch notch image of a point switch is characterized by comprising the following steps:
acquiring a historical notch image of each point switch turnout, and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch;
calculating the similarity between the area range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image;
transforming and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments, and further determining the coordinates of the notch line; and identifying the notch image according to the notch line coordinate.
2. The method for automatically identifying a switch machine switch gap image as claimed in claim 1, wherein the gap image comprises a positioning gap image and an inversion gap image; the notch image feature library comprises a positioning notch image feature library and an inverted notch image feature library.
3. The method of claim 1, wherein the step of preprocessing the acquired current image of the switch point gap and comparing the preprocessed current image with a gap image feature library to obtain an area range image of the switch point gap comprises:
decomposing the obtained current image of the turnout gap of the point switch into r, g and b three-color images;
the brightness of the three-color image is balanced, and then a second notch image is synthesized again;
and comparing the second notch image with a notch image feature library to obtain an area range image where the notch is located, and cutting the area range image.
4. The method for automatically identifying the switch machine turnout gap image according to claim 1, wherein the method for calculating the similarity between the area range image and the gap image feature library comprises the following steps:
wherein the content of the first and second substances,
pixel points of the segmentation blocks in the notch image feature library are represented;
pixel points of segmentation blocks in the image of the area range are represented;
5. The method for automatically identifying a switch machine switch gap image as claimed in claim 1, wherein the process of denoising the region range image comprises:
increasing the contrast of the region range image, and then removing small noise points by adopting a median filtering mode; and converting the region range image with the small noise points removed into a gray level image.
6. The method of claim 5, wherein the process of adding contrast to the area-wide image comprises:
by using
Recalculating the current pixel coordinates;
wherein
Is the current pixel coordinate;
coordinates to the left of the current pixel coordinates;
coordinates to the right of the current pixel coordinates;
coordinates in front of the current pixel coordinates;
as the coordinates after the current pixel coordinates.
7. The method of claim 1, wherein the step of extracting the notch edge comprises: and traversing the monitoring blocks with preset odd numbers, and adopting self-adaptive threshold binarization to calculate the maximum notch line characteristic point.
8. The method as claimed in claim 7, wherein the detailed process of finding the maximum notch line feature point by adaptive threshold binarization comprises:
respectively monitoring the characteristics of the notch lines by adjusting the size of the monitoring block; the size range of the monitoring blocks is [3,31] and is odd;
after the size of the monitoring block is changed every time, the coordinates of the straight boundary line in the binarization result and the number of points which meet the conditions in the straight boundary line are obtained;
after traversing all monitoring blocks, solving a maximum point; if the maximum point number in the Y direction is larger than the threshold value of the gap searching range, the gap searching is successful.
9. The method as claimed in claim 1, wherein the step of transforming and searching for the line segments meeting the preset conditions from the extracted result of the notch edge, determining the slopes and intercepts of all the line segments, and determining the coordinates of the notch line comprises:
transforming and searching line segments meeting preset conditions from the result extracted from the notch edge according to Hough transformation; the preset conditions are as follows: the radius step length is 1, and the angle step length is pi/180 of all line segments;
the slope and intercept y = kx + b of all line segments; wherein k is the slope and b is the intercept;
finding out the line segment with the longest line segment and the largest slope absolute value from all the line segments;
and substituting the y coordinate value of the central point of the notch searching range into a formula y = kx + b, and solving the value of x, namely the coordinate of the notch line.
10. An automatic identification system for a switch machine turnout notch image is characterized by comprising a comparison module, an extraction module and a determination module;
the comparison module is used for acquiring historical notch images of the switch points of each switch machine and generating a notch image feature library; preprocessing the acquired current image of the turnout notch of the point switch, and then comparing the preprocessed current image with a notch image feature library to obtain an area range image of the fixed reverse position of the point switch;
the extraction module is used for calculating the similarity between the region range image and the notch image feature library; under the condition that the similarity is satisfied, performing notch edge extraction after the noise reduction processing on the region range image;
the determining module is used for converting and searching line segments meeting preset conditions from the extracted result of the notch edge, determining the slope and intercept of all the line segments and further determining the coordinates of the notch line; and identifying the notch image type according to the notch line coordinate.
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