CN113516009A - Method for eliminating influence of watermark on image of power transmission line - Google Patents
Method for eliminating influence of watermark on image of power transmission line Download PDFInfo
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- CN113516009A CN113516009A CN202110374052.5A CN202110374052A CN113516009A CN 113516009 A CN113516009 A CN 113516009A CN 202110374052 A CN202110374052 A CN 202110374052A CN 113516009 A CN113516009 A CN 113516009A
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Abstract
The invention discloses a method for eliminating the influence of watermark on an image of a power transmission line, which screens hidden danger alarms possibly caused by the watermark based on the identified hidden danger types and hidden danger positions, confirms whether the hidden danger alarms caused by the watermark are hidden danger alarms or not by carrying out Tesseract-OCR character identification on the hidden danger alarms, and further eliminates the influence of the watermark on an identification result. Aiming at the technical defect that image watermarks are difficult to distinguish by adopting single hidden danger identification in the prior art, the invention can accurately distinguish the image watermarks from real wire foreign matters, avoid accumulation of wrong hidden danger information and improve the efficiency of artificial auxiliary identification.
Description
Technical Field
The invention discloses a method for eliminating the influence of watermark on an image of a power transmission line, and belongs to the technical field of detection of hidden danger of the power transmission line.
Background
With the continuous development of the technology for identifying the hidden danger of the channel of the power transmission line, the technology for automatically identifying and alarming the hidden danger is widely applied to the field of power transmission line detection, and the hidden danger which threatens a wire, such as a foreign wire, a crane and the like, can be accurately identified at present. In the actual image identification process, the watermark information on the image has great influence on the identification result, the part where the watermark is overlapped with the wire is easily identified as the wire foreign matter, and the manpower resource is wasted to confirm whether the hidden danger of the real wire foreign matter exists.
The existing solution is to increase positive and negative samples of the foreign matter on the wire to continue training the recognition model, so as to improve the recognition effect of the model, but the recognition model is difficult to distinguish for the foreign matter on the wire with the shape similar to the watermark.
In summary, how to provide an efficient and reliable method for eliminating watermark influence on a power transmission line channel to improve the reliability of a hidden danger identification result is one of the problems to be solved by the technical staff in the field at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for eliminating the influence of the watermark on the image of the power transmission line. The method can eliminate the influence of the watermark on the identification result in the process of identifying the hidden danger of the power transmission line channel.
Summary of The Invention
The method screens the hidden danger alarms possibly caused by the watermark based on the identified hidden danger types and hidden danger positions, confirms whether the hidden danger alarms caused by the watermark are the hidden danger alarms caused by the watermark or not by carrying out Tesseract-OCR character identification on the hidden danger alarms, and further eliminates the influence of the watermark on the identification result.
The detailed technical scheme of the invention is as follows:
a method for eliminating the influence of watermark on the image of a power transmission line is characterized by comprising the following steps:
a. identifying the power transmission line channel image by using the existing hidden danger identification software aiming at the power transmission line channel image to obtain a hidden danger identification result;
b. extracting the hidden danger of the foreign matters of the wires in the identification result and giving an alarm;
c. judging whether a region corresponding to the wire foreign matter hidden danger alarm is superposed with a watermark position of a transmission line channel image, wherein the watermark position is information preset and stored in a system;
when the area is coincident with the watermark position, skipping to the step d;
when the area is not coincident with the watermark position, skipping to the step e;
d. c, carrying out character recognition on the hidden danger of the watermark position area, and filtering the hidden danger recognition result of the alarm corresponding to the recognized character and/or data symbol in the step a;
e. and (6) ending.
According to the invention, the character recognition is preferably Tesseract-OCR character recognition.
According to the present invention, the watermark position is the information preset to be stored in the system, including but not limited to: the coordinate range of the watermark position in the power transmission line channel image and the data rule of the display content of the watermark position, wherein the data rule comprises the type of character data, the arrangement rule of the character data and the data symbols among the character data.
According to the optimization of the invention, when the region is partially overlapped with the watermark position, the step d is skipped, and the watermark position is called to carry out information auxiliary to carry out character recognition on the hidden danger of the watermark position region.
Compared with the prior art, the invention has the following technical advantages:
aiming at the technical defect that image watermarks are difficult to distinguish by adopting single hidden danger identification in the prior art, the invention can accurately distinguish the image watermarks from real wire foreign matters, avoid accumulation of wrong hidden danger information and improve the efficiency of artificial auxiliary identification.
The invention introduces the concept of watermark position information in a breakthrough way, carries out range identification on the identified hidden danger information and the watermark position, and only the hidden danger information falling into the watermark position needs to be confirmed in a character identification way, if characters and/or data symbols exist, corresponding hidden dangers are directly filtered.
In addition, the invention also introduces a Tesseract-OCR character recognition algorithm, can quickly confirm whether the hidden danger is the watermark, and obviously improves the recognition speed compared with a hidden danger recognition model.
In order to further improve the identification effect of the invention, the invention further prefers to perform system prestoring on watermark position information, and when the region is partially overlapped with the watermark position, the watermark position can be called to perform information auxiliary to perform character identification on the hidden danger of the watermark position region.
Drawings
Fig. 1 is a schematic flow chart of a method for eliminating the influence of watermark on an image of a power transmission line according to the present invention;
FIG. 2 shows that in step a of the present invention, a hidden danger identification result is obtained by identifying a transmission line channel image using a conventional hidden danger identification model for the transmission line channel image;
in fig. 2, the collected image of a certain transmission line channel is shown, wherein the area at the upper left corner of the image is the watermark position, wherein "2019-10-14" is the collection date of the image, "13: 40: 13" is the collection time of the image, and the "frame" on the collection date in the image is the content filtered by the method of the present invention; the record "colorbeads 0.86" is a foreign matter of the wire, and the confidence rate is 0.86.
Detailed Description
The invention is further described below, but not limited thereto, with reference to the following examples and the accompanying drawings.
Examples 1,
As shown in fig. 1.
a. Identifying the power transmission line channel image by using the existing hidden danger identification software aiming at the power transmission line channel image to obtain a hidden danger identification result;
b. extracting the hidden danger of the foreign matters of the wires in the identification result and giving an alarm;
c. judging whether a region corresponding to the wire foreign matter hidden danger alarm is superposed with a watermark position of a transmission line channel image, wherein the watermark position is information preset and stored in a system;
when the area is coincident with the watermark position, skipping to the step d;
when the area is not coincident with the watermark position, skipping to the step e;
d. c, carrying out character recognition on the hidden danger of the watermark position area, and filtering the hidden danger recognition result of the alarm corresponding to the recognized character and/or data symbol in the step a;
e. and (6) ending.
The character recognition is Tesseract-OCR character recognition.
The watermark location is information preset to be stored in the system, including but not limited to: the coordinate range of the watermark position in the power transmission line channel image and the data rule of the display content of the watermark position, wherein the data rule comprises the type of character data, the arrangement rule of the character data and the data symbols among the character data. In the present embodiment, the watermark location information includes a number and "-".
Application example:
the method in the embodiment 1 is applied to images shot in one day in a certain power transmission line channel, 120 wire foreign matter alarms are totally obtained after hidden danger identification, the wire foreign matter alarms are extracted, position judgment and Tesseract-OCR character identification are carried out, the condition that the hidden danger alarms are caused by watermarks is filtered, and the influence of the watermarks on identification results is eliminated.
a. Extracting the hidden danger of the foreign matters of the wires in the identification result and giving an alarm;
the source program code of the alarm data is displayed as follows:
the image display result is shown in the attached figure 2;
the field meanings of the source program code are shown in the table 1:
table 1: field meaning of source program code
| Field(s) | Type (B) | Means of |
| filename | string | Filename |
| width | int | Image width |
| height | int | Image height |
| objects.tag | string | Type of hidden danger |
| objects.score | float | Confidence rate |
| objects.frame.x | int | Coordinate x of upper left corner of alarm box |
| objects.frame.y | int | Alarm box upper left corner coordinate y |
| objects.frame.width | int | Alarm frame width |
| objects.frame.height | int | Alarm frame height |
b. Judging whether the wire foreign matter hidden danger alarm is positioned at the watermark position on the upper left of the image, and screening the wire foreign matter hidden danger alarm in the watermark region; wherein, the watermark position area is: xmin: 30, ymin: 50, xmax: 600, ymax: 100, respectively;
c. performing Tesseract-OCR character recognition on the hidden danger of the watermark position, and filtering the alarm containing numbers or a' -symbol in the recognition result, wherein the Tesseract-OCR character recognition result is as follows: '2019-10-21' and '10-14';
d. and filtering the alarm corresponding to the number or the '-' symbol contained in the identification result.
In the application example, a Tesseract-OCR character recognition algorithm is adopted, so that the influence on the transmission line channel watermark caused by the result is eliminated. The problem of hidden danger warning caused by watermarks is well solved, the automation level of the warning detection of the power transmission line is improved, and the time cost for operation and maintenance personnel to confirm the warning is reduced.
Through statistics, in the application example, the false alarm rate of identifying the foreign matters of the model wires is reduced by 0.5 through eliminating the influence of the watermarks. The confirmation rate of the hidden danger alarm caused by the watermark reaches 0.89.
Examples 2,
The method of embodiment 1, further comprising: and when the region is overlapped with the watermark position part, skipping to the step d, calling the watermark position to carry out information auxiliary to carry out character recognition on the hidden danger of the watermark position region. For example: when the shape or the pattern of the foreign matter of the wire is recorded with characters and symbols, unnecessary interference is caused to the character recognition in the step d, therefore, the invention calls the watermark position information pre-stored in the system, and by verifying which contents are related to the character data and the symbol data specifically contained in the watermark position, the contents of the characters and the symbols are not filtered even if the characters are recognized, thereby improving the recognition effect.
Claims (4)
1. A method for eliminating the influence of watermark on the image of a power transmission line is characterized by comprising the following steps:
a. identifying the power transmission line channel image by using the existing hidden danger identification software aiming at the power transmission line channel image to obtain a hidden danger identification result;
b. extracting the hidden danger of the foreign matters of the wires in the identification result and giving an alarm;
c. judging whether a region corresponding to the wire foreign matter hidden danger alarm is superposed with a watermark position of a transmission line channel image, wherein the watermark position is information preset and stored in a system;
when the area is coincident with the watermark position, skipping to the step d;
when the area is not coincident with the watermark position, skipping to the step e;
d. c, carrying out character recognition on the hidden danger of the watermark position area, and filtering the hidden danger recognition result of the alarm corresponding to the recognized character and/or data symbol in the step a;
e. and (6) ending.
2. The method for eliminating the influence of the watermark on the image of the power transmission line according to claim 1, wherein the character recognition is Tesseract-OCR character recognition.
3. The method for eliminating the influence of the watermark on the image of the power transmission line according to claim 1 or 2, wherein the watermark position is information preset and stored in a system, and the information includes but is not limited to: the coordinate range of the watermark position in the power transmission line channel image and the data rule of the display content of the watermark position, wherein the data rule comprises the type of character data, the arrangement rule of the character data and the data symbols among the character data.
4. The method for eliminating the influence of the watermark on the image of the power transmission line according to claim 3, wherein when the area partially coincides with the watermark position, the step d is skipped, and the watermark position is called to perform information-assisted character recognition on the hidden danger of the watermark position area.
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| CN202110374052.5A CN113516009A (en) | 2021-04-07 | 2021-04-07 | Method for eliminating influence of watermark on image of power transmission line |
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| CN202110374052.5A CN113516009A (en) | 2021-04-07 | 2021-04-07 | Method for eliminating influence of watermark on image of power transmission line |
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