CN111553341B - Cultural relic disassembly relative position verification method based on two-dimensional code - Google Patents
Cultural relic disassembly relative position verification method based on two-dimensional code Download PDFInfo
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Abstract
The invention discloses a two-dimensional code-based cultural relic disassembly relative position verification method, which comprises the steps of attaching two-dimensional codes to each cultural relic, taking pictures, judging positions according to the two-dimensional code relative position information in an original graph and a verification graph before the cultural relic is disassembled, marking error positions and rotation error angles of the two-dimensional codes, and then repairing the cultural relics again according to the marked error information until the original graph and the verification graph are successfully matched. The two-dimensional code verification method provided by the invention can be used for performing real-time photographing verification according to the engineering progress, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of cultural relic protection, and particularly relates to a cultural relic disassembly relative position verification method based on two-dimensional codes.
Background
All the cultural relics must be faithful to the original cultural relics in the whole process of repairing the cultural relics, and the original cultural relics are never allowed to be changed by subjective assumption of the cultural relics. Because even minor changes can cause the cultural relics to lose authenticity. Otherwise, the distortion is repaired, which necessarily causes the value of the cultural relics to be lost.
In the current construction flow for decomposing and migrating cultural relics, a craftsman marks a brick body according to a set of rules which the craftsman follows, and the marking modes are various and have no unified standard. The inspection unit is difficult to inspect the repaired cultural relic engineering, and is difficult to judge whether the position of the repaired cultural relic member is the same as that before repair, and due to the backward technical mode, the position of the repaired cultural relic member is changed, and the original historical cultural information is lost.
Therefore, it is necessary to provide a new method for verifying the relative position of the disassembly of the cultural relics.
Disclosure of Invention
In order to solve the problems, the invention provides a two-dimensional code-based cultural relic disassembly relative position verification method, which comprises the following steps:
step one: attaching a two-dimensional code to each cultural relic unit to be disassembled and photographing to obtain an original image;
step two: restoring and photographing the disassembled and migrated cultural relics to obtain a check chart;
step three: judging the relative positions of the two-dimensional codes in the original graph and the check graph before the relics are disassembled;
step four: marking out error positions and rotation error angles of the two-dimensional codes;
step five: and restoring the cultural relics according to the marked error information until the original graph and the check graph are successfully matched.
The further scheme is that the distinguishing of the relative position of the two-dimensional code in the third step comprises the following steps: rotation degree of the same two-dimensional code in two figures is judged, relative positions of the two-dimensional codes are judged, relative positions of three two-dimensional codes are judged, and relative positions of a plurality of two-dimensional codes are judged.
The rotation degree judging method of the same two-dimensional code in the two figures further comprises the following steps:
a1: establishing vectors according to a first point and a second point in three coordinate points of a two-dimensional code, and respectively extracting two-point vectors of the same two-dimensional code in an original graph and a check graph;
a2: calculating two vector angles;
a3: judging whether the vector angle is larger than a threshold value, if so, the angle is wrong, and if not, the angle is correct.
The relative position judging method of the two-dimensional codes comprises the following steps:
b1, respectively extracting two-point vectors of the same two-dimensional code in an original image and a check image;
b2, calculating two vector angles;
b3, judging whether the vector angle is larger than a threshold value, if so, the angle is wrong, and if not, continuously judging whether other two-dimensional codes exist between the two-dimensional codes;
and b4, if other two-dimensional codes exist, the position is wrong, and if other two-dimensional codes do not exist, the position is correct.
The method for judging the relative positions of the three two-dimensional codes comprises the following steps:
c1, respectively extracting coordinates of two-dimensional code points in a check chart;
c2, checking the position of the bright spot; if any two-dimensional codes are not accurately checked, judging that the position is wrong;
c3, transforming the three-point positions into other 5 position relations according to the arrangement and combination, and judging;
c4, if the correctness cannot be judged under all conditions, marking three two-dimensional codes as errors; if the two-dimensional code can be judged to be correct after the exchange is attempted, the position where the two-dimensional code should be in the check chart, namely the position after the position exchange is marked.
The method for judging the relative positions of the two-dimensional codes further comprises the following steps:
d1, extracting two-dimensional code triangles closest to each two-dimensional code information in a check graph;
d2: a three-point checking method is used for judging whether the positions of the three two-dimensional codes are correct or not;
d3: if not, calculating the next point and two adjacent points, so as to reciprocate, and if so, calculating the side length ratio of the triangle in the two graphs, so as to calculate the scaling ratio;
d4: in the process of calculating the scaling ratio, if all points in the check graph are traversed and correct triangles cannot be found, the fact that the errors in the check graph are serious cannot be judged is indicated;
d5: determining the three previous correct two-dimensional codes as correct positions, and starting to judge whether the position of the next two-dimensional code is correct;
d6: the judgment points are respectively connected with the correct coordinates of the three points, the edge length difference and the angle difference are calculated through the scaling ratio, the judgment is correct when the edge length difference and the angle difference are smaller than a certain threshold value, the judgment points are put into a correct point group, and if the judgment points are incorrect, the correct positions of the points can be marked in the check graph according to the relative positions of the points and the three correct points in the original graph
The beneficial effects of the invention are as follows:
(1) The two-dimensional code verification method provided by the invention can be used for performing real-time photographing verification according to the engineering progress, and the working efficiency is improved.
(2) Compared with the prior method, the method can reduce the loss of the cultural relics caused by the mistake of the worker.
Drawings
Fig. 1: general flow chart for repairing and checking cultural relics
Detailed Description
The invention will be further described with reference to the drawings and embodiments.
As shown in fig. 1, the embodiment provides a method for verifying the relative position of the disassembly of cultural relics based on two-dimension codes, wherein each cultural relic is attached with a two-dimension code and a photo is taken, position discrimination is performed according to the relative position information of the two-dimension codes in an original diagram and a verification diagram before the disassembly of the cultural relics, and error positions and rotation error angles of the two-dimension codes are marked. Because there are many possibilities that the position check is wrong, the discrimination modes under multiple conditions need to be established respectively, and therefore the check conditions mainly considered in the scheme are as follows: rotation degree of the same two-dimensional code in two figures is judged, relative positions of the two-dimensional codes are judged, relative positions of three two-dimensional codes are judged, and relative positions of a plurality of two-dimensional codes are judged.
Example 1
The rotation degree of the same two-dimensional code in the two figures is judged so as to be capable of detecting the problem of the placing gesture of the cultural relics. Three (or four) corner coordinates of the two-dimensional code can be detected in the two-dimensional code recognition algorithm and stored in the data in sequence. Therefore, vectors can be directly established between a first point and a second point in three coordinate points of one two-dimensional code, the angles of vectors of the same two-dimensional code in two figures are calculated, and if the angles are larger than a certain threshold, it is determined that the cultural relics have gesture errors.
Example 2
If only two pieces of cultural relic information exist in the check graph, two point vectors of the cultural relic information in the check graph and the original synthetic graph are needed to be calculated, the angles of the two vectors are calculated, if the angles are smaller than a threshold value, whether other pieces of cultural relic information exist between the two points in the original synthetic graph is judged continuously, and if the position is not correct, the position is not correct.
Example 3
If only three pieces of cultural relic information exist in the verification diagram, extracting two-dimensional code information of the three pieces of cultural relics in pairs, judging according to a two-point position verification method respectively, and if any two pieces of two-dimensional code verification is inaccurate, judging that the position is wrong. At the same time, the exchange three-point position is tried to be judged again (5 exchange conditions are combined according to the arrangement), and if the exchange three-point position is not judged correctly in all conditions, the three two-dimensional codes are marked as errors. If the two-dimensional code can be judged to be correct after the exchange is attempted, the position where the two-dimensional code should be in the check chart, namely the position after the position exchange is marked.
Example 4
The number of the Chinese information in the verification graph is greater than three situations which are judged to be multi-point position verification in the algorithm, and the situation is the most frequent in the later use process, and the algorithm is designed and described as follows:
because of the shooting distance problem, the distance between two-dimensional codes is in a scaling relationship in the two images, which is also the reason why whether other information exists between two points in the original synthetic image or not needs to be judged after the right angle is judged in the two-point algorithm. Therefore, the present algorithm needs to find the scaling ratio of the two graphs first to facilitate the determination of the verification algorithm.
Firstly, extracting two-dimensional code information closest to each two-dimensional code information in a check graph to form a triangle, then, judging whether the three two-dimensional code positions are correct or not by using a three-point check method, if not, calculating the next point and two adjacent points, so as to reciprocate, and if correct, calculating the side length ratio of the triangle in the two graphs, so as to calculate the scaling ratio.
In the process of calculating the scaling ratio, if all points in the check graph are traversed and correct triangles cannot be found, the fact that the errors in the check graph are serious cannot be judged is indicated. Under the condition of known scaling ratio, the three previous correct two-dimensional codes are determined to be correct positions, and whether the position of the next two-dimensional code is correct or not is judged. The judging method comprises the following steps: firstly, the judging points are respectively connected with the correct three point coordinates, the edge length difference and the angle difference are calculated through the scaling ratio, the judging points are judged to be correct if the edge length difference and the angle difference are smaller than a certain threshold value, the judging points are placed into a correct point group, and if the judging points are incorrect, the correct positions of the points can be marked in the check graph according to the relative positions of the points and the three correct points in the original graph. If the number of the correct point groups is larger than three points, when judging the next two-dimensional code coordinate point, three points with the center of gravity closest to the judging point are selected from the correct point groups for judgment, so that the judging accuracy is improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (1)
1. The cultural relic disassembly relative position verification method based on the two-dimensional code is characterized by comprising the following steps of:
step one: attaching a two-dimensional code to each cultural relic unit to be disassembled and photographing to obtain an original image;
step two: restoring and photographing the disassembled and migrated cultural relics to obtain a check chart;
step three: the method comprises the following steps of judging the relative positions of two-dimension codes in an original diagram and a check diagram before the relics are disassembled, wherein the method specifically comprises the following steps:
A. the rotation degree of the same two-dimensional code in two figures is judged, and the method comprises the following steps:
a1: establishing vectors according to a first point and a second point in three coordinate points of a two-dimensional code, and respectively extracting two-point vectors of the same two-dimensional code in an original graph and a check graph;
a2: calculating two vector angles;
a3: judging whether the vector angle is larger than a threshold value, if so, the angle is wrong, and if not, the angle is correct;
B. the relative position of two-dimensional codes is judged, and the method comprises the following steps:
b1: respectively extracting two-point vectors of the same two-dimensional code in the original diagram and the check diagram;
b2: calculating two vector angles;
b3: judging whether the vector angle is larger than a threshold value, if so, the angle is wrong, and if not, continuously judging whether other two-dimensional codes exist between the two-dimensional codes;
b4: if other two-dimensional codes exist, the position is wrong, and if other two-dimensional codes do not exist, the position is correct;
C. the relative position of the three two-dimensional codes is judged, and the method comprises the following steps:
c1: respectively extracting two-dimensional code point coordinates in the check graph;
c2: b, using the relative position judging method of the two-dimensional codes in the step, and judging that the position is wrong if any two-dimensional codes are inaccurate in verification;
c3: the three-point position is transformed according to the arrangement combination and the other 5 position relations are judged;
c4: if the judgment is not correct under all conditions, marking the three two-dimensional codes as errors; if the two-dimensional code can be judged to be correct after the exchange is attempted, marking the position where the two-dimensional code should be in the check chart, namely the position after the position exchange;
D. the method for judging the relative positions of the two-dimensional codes comprises the following steps:
d1: extracting two nearest two-dimensional codes from each two-dimensional code information in the check graph to form a triangle;
d2: judging whether the positions of the three two-dimensional codes are correct or not by using the relative position judging method of the three two-dimensional codes in the step C;
d3: if not, calculating the next point and two adjacent points, so as to reciprocate, and if so, calculating the side length ratio of the triangle in the two graphs, so as to calculate the scaling ratio;
d4: in the process of calculating the scaling ratio, if all points in the check graph are traversed and correct triangles cannot be found, the fact that the errors in the check graph are serious cannot be judged is indicated;
d5: determining the three previous correct two-dimensional codes as correct positions, and starting to judge whether the position of the next two-dimensional code is correct;
d6: the judgment points are respectively connected with the correct three point coordinates, the edge length difference and the angle difference are calculated through the scaling ratio, the judgment is correct when the edge length difference and the angle difference are smaller than a certain threshold value, the judgment points are placed into a correct point group, and if the judgment points are incorrect, the correct positions of the points can be marked in the verification graph according to the relative positions of the points and the three correct points in the original graph;
step four: marking out error positions and rotation error angles of the two-dimensional codes;
step five: and restoring the cultural relics according to the marked error information until the original graph and the check graph are successfully matched.
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