KR20210145447A - Vehicle Identification System and Method of Processing the same - Google Patents

Abstract

The present invention relates to a mobile medical imaging system and an X-ray detection area control method, which can improve convenience and information reliability for medical staff. The system comprises: an X-ray generator for generating and radiating X-rays; an iris positioned in front of the X-ray generator to determine an X-ray radiation area; an X-ray detector for generating an X-ray image of a patient by receiving an X-ray that has passed through the patient after being emitted from the X-ray generator; a camera for photographing an X-ray detection area of the detector; an imaging table for fixing a position of the patient; an imaging table support for supporting the imaging table and determining a position of the imaging table; and a controller configured to display the X-ray detection area, correct the X-ray detection area as an area of interest by controlling at least one of the iris and the imaging table support when a partial area of the X-ray detection area is selected as the area of interest.

Description

Vehicle identification system and method of processing the same

The present invention relates to a vehicle number recognition apparatus and method for checking the validity of a vehicle number recognition result.

The conventional system for recognizing the number of a vehicle uses a video image obtained from a video captured by a CCTV and an instantaneous recording method using a digital camera by a signal detected from a sensor when entering a vehicle as input.

They fix the camera at a specific location and install a detection sensor on the vehicle entrance to recognize vehicle entry, so license plate loss and image damage may occur at the time of entry due to vehicle traffic jams, entry speed, sunlight, etc. can only be installed.

A conventional apparatus for extracting an image of a license plate is disclosed in Korean Patent Application No. 2001-28018. The patent application is converted into color coordinates to extract the license plate image, and has reference color data to detect the position of the vehicle number. In addition, by projecting the detected image data on a two-dimensional plane, there is a disadvantage that the movement or direction of the vehicle cannot be detected.

In addition, Republic of Korea Patent Application No. 2003-97042 discloses a device for recognizing a license plate using color image processing is disclosed.

The device is characterized in that it uses a template-based correlation to recognize the text of the vehicle. It can also be seen that this is a technology used in a limited manner in a parking management system. Also, the operation of extracting valid data by checking whether the recognized data is valid is not performed.

Accordingly, an object of the present invention is to provide a vehicle number recognition apparatus and method for checking the validity of a vehicle number recognition result.

As a means for solving the above problem, according to an embodiment of the present invention, when a vehicle image is obtained, the method comprising: recognizing letters and numbers in the vehicle image; recognizing a combination pattern of letters and numbers based on the number of letters and numbers, sort order, and positional relationship; and comparing the combination pattern of the letters and numbers with a preset vehicle number pattern, and then obtaining and outputting the vehicle number only upon matching; provides a vehicle number recognition method comprising a.

The vehicle number pattern is set differently depending on the type of vehicle, and it is characterized in that it is determined based on the number of letters and numbers in the vehicle number plate, an arrangement order, and a positional relationship.

The step of recognizing the letters and numbers is characterized in that after extracting a region of interest in which the license plate is photographed from the vehicle image, the step of recognizing the letters and numbers through the region of interest is further comprising.

The step of obtaining and outputting the vehicle number compares the image characteristics of the region of interest and the license plate to distinguish a vehicle type, and then analyzes a letter and number combination pattern using only the vehicle number pattern corresponding to the vehicle type. characterized by performing.

As a means for solving the above problem, according to another embodiment of the present invention, after recognizing letters and numbers in an image of a vehicle, a combination pattern of letters and numbers based on the number, sorting order and positional relationship of the letters and numbers a character recognition unit to determine And a vehicle number recognition device comprising a vehicle number identification unit that stores and manages a preset vehicle number pattern, compares the combination pattern of letters and numbers with the vehicle number pattern, and obtains and outputs the vehicle number only when they match to provide.

The vehicle number recognition apparatus further comprises a region of interest extractor that extracts the region of interest in which the license plate is photographed from the vehicle image and then provides only the image of the region of interest to the text recognition unit.

In addition, the vehicle number recognition device distinguishes the vehicle type by comparing the image characteristics of the region of interest and the license plate, and after identifying the letters or numbers that are likely to be manipulated, the vehicle number recognition result, the vehicle type, and the possibility of operation It is characterized in that it further comprises an additional information providing unit that generates and provides at least one of letters or numbers.

An object of the present invention is to provide a vehicle number recognition apparatus and method for checking the validity of a vehicle number recognition result.

In addition, after identifying the type of vehicle and identifying the letters or numbers that may be manipulated at the same time, it is also possible to provide these information as a search clue for illegally modified vehicle license plates.

1 is a view for explaining a vehicle number recognition apparatus according to an embodiment of the present invention.
2 is a diagram illustrating vehicle number patterns according to an embodiment of the present invention.
3 is a view for explaining a vehicle number recognition method according to an embodiment of the present invention.
4 is a view for explaining a vehicle number recognition method according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Even if the terms are the same, if the indicated parts are different, it is to be said in advance that the reference numerals do not match.

And the terms to be described later are terms set in consideration of the function in the present invention, which may vary according to the intention or custom of medical personnel such as the experimenter and the measurer, so the definition should be made based on the content throughout this specification.

In this specification, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate the overall understanding, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 is a view for explaining a vehicle number recognition apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , the vehicle number recognition apparatus 100 of the present invention includes a vehicle image acquisition unit 110 , a region of interest extraction unit 120 , a character recognition unit 130 , a vehicle number identification unit 140 , and an additional and an information providing unit 150 .

The vehicle image acquisition unit 110 interworks with an external device to receive and store a vehicle image acquired and provided by the external device, or to directly acquire and store a vehicle image through a built-in camera.

In addition, the vehicle image acquisition unit 110 removes or minimizes noise (eg, shadow, light reflection) existing in the vehicle image through image pre-processing and correction of the vehicle image, thereby reducing the possibility of image recognition errors in advance. to be blocked.

The character recognition unit 130 is provided with a character recognition program, and through this, recognizes both letters and numbers, that is, texts existing in the vehicle image. Then, a combination pattern of letters and numbers is identified based on the number of letters and numbers, sort order, and positional relationship.

The vehicle number identification unit 130 acquires in advance a plurality of vehicle number patterns corresponding to each type of vehicle, and stores and manages them. And after verifying the validity by comparing and analyzing the combination pattern of letters and numbers identified through the text recognition unit 130 with each of the previously obtained vehicle number patterns, only the currently recognized combination pattern of letters and numbers is applied to the vehicle Final acquisition and output by number.

In addition, the present invention may further include a region of interest setting unit 120 for minimizing the image processing load. At this time, the region of interest setting unit 120 pre-defines the image characteristics (ie, shape, aspect ratio, and color) of the license plate, and based on this, extracts and sets only the region of interest in which the license plate is photographed from the vehicle image. do.

That is, by allowing the character recognition operation to be performed only on the image corresponding to the license plate rather than the entire vehicle image through the region of interest setting unit 120 , an unnecessary increase in the image processing load is prevented in advance.

In addition, the present invention may further include an additional information providing unit 150 that obtains and provides a search clue of an illegally modified vehicle license plate.

For reference, there are frequent cases of illegally modifying specific numbers or characters on vehicle license plates. For example, there is a case where the number "6" is illegally converted into the number "8", and the letter "4" is illegally converted into "character". However, in this case, a phenomenon in which the positional relationship and the aspect ratio of numbers or characters are abnormally deformed may occur.

Accordingly, the additional information providing unit 150 of the present invention further analyzes the positional relationship and the aspect ratio of each letter and number, so that it is possible to extract and notify a letter or number with possibility of manipulation. In addition, after tracing the vehicle type from the shape, aspect ratio, and color of the region of interest, it is also possible to provide its information.

That is, if the vehicle recognition result validation fails, additional information to guide at least one of a vehicle number recognition result, a vehicle type, and a letter or number with possibility of manipulation through the vehicle number identification unit 130 can be generated and provided. In the future, a third party, such as a police officer, can use the information to more easily search for an illegally modified vehicle license plate.

As such, in the present invention, the validity of the vehicle number recognition result is checked once again based on the combination pattern of letters and numbers, rather than simply recognizing the letters and numbers present in the vehicle license plate area and providing them as vehicle numbers, and then output the final output. By doing so, the reliability of the operation can be maximized.

2 is a diagram illustrating vehicle number patterns according to an embodiment of the present invention.

As shown in FIG. 2 , the vehicle type may be classified into a general vehicle, a diplomatic vehicle, a transportation vehicle, a heavy equipment vehicle, and an eco-friendly vehicle. There is this.

Therefore, in the present invention, by identifying the number, sorting order, and positional relationship of letters and numbers that vary by vehicle type, and acquiring and storing these information as a vehicle number pattern, only the vehicle number recognition result having the corresponding vehicle number pattern is used as valid information in the future. Select and make available.

3 is a view for explaining a vehicle number recognition method according to an embodiment of the present invention.

If the vehicle image is acquired (S1), based on a preset ROI setting criterion, the ROI in which the license plate is photographed is extracted and set from the vehicle image (S2).

And, by converting the image of the region of interest into text through a document recognition program, and after recognizing both letters and numbers in the region of interest, letters and numbers based on the number of letters and numbers, sort order, and positional relationship Determines a combination pattern of (S3), and sequentially compares it with all of the previously obtained vehicle number patterns (S4).

As a result of the comparison of step S4, if there is a vehicle number pattern matching the combination pattern of letters and numbers (S5), the current vehicle number recognition result of step S3 is obtained and output as a vehicle number (S6).

On the other hand, if there is no vehicle number pattern matching the combination pattern of letters and numbers (S5), the vehicle number recognition failure is confirmed and notified (S7).

In the description of FIG. 3, the validity of the vehicle number recognition result is checked by sequentially using all of the plurality of vehicle number patterns.

On the other hand, as described above, there is a characteristic that image characteristics such as the shape, aspect ratio, and color of the license plate vary depending on the type of vehicle.

Accordingly, in the present invention, as in FIG. 4 , the vehicle type is distinguished using the shape, aspect ratio, and color of the region of interest where the license plate is photographed, and only one vehicle number pattern corresponding to the vehicle type is selected (S3'). ).

And after recognizing all of the letters and numbers existing in the region of interest through the document recognition program, a combination pattern of letters and numbers is determined based on their number, sort order, and positional relationship (S4').

And by comparing the combination pattern of letters and numbers with the vehicle number pattern selected through step S3', the validity of the vehicle number recognition result is checked (S5').

That is, by comparing the image features of the license plate and the region of interest and selecting only one vehicle number pattern required for validity check, a combination pattern comparison operation of letters and numbers can be performed only once.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

110: vehicle image acquisition unit 120: ROI extraction unit
130: character recognition unit 140: vehicle number identification unit
150: additional information providing unit

Claims (7)

when a vehicle image is acquired, recognizing letters and numbers in the vehicle image;
identifying a combination pattern of letters and numbers based on the number of letters and numbers, sort order, and positional relationship; and
Vehicle number recognition method comprising a; after comparing the combination pattern of the letters and numbers with a preset vehicle number pattern, and obtaining and outputting the vehicle number only when they match. According to claim 1, wherein the vehicle number pattern
Vehicle number recognition method, which is set differently depending on the vehicle type, and is determined based on the number of characters and the numbers in the license plate, sort order, and positional relationship. The method of claim 2, wherein recognizing the letters and numbers comprises:
After extracting the region of interest in which the license plate is photographed from the vehicle image, the method further comprising the step of recognizing the letters and numbers through the region of interest. According to claim 3, wherein the step of obtaining and outputting the vehicle number
After distinguishing the vehicle type by comparing the image characteristics of the region of interest and the license plate, vehicle number recognition method, characterized in that the character and number combination pattern analysis operation is performed using only the vehicle number pattern corresponding to the vehicle type . a character recognition unit for recognizing characters and numbers in a vehicle image and then recognizing a combination pattern of characters and numbers based on the number, sort order, and positional relationship of the characters and numbers; and
A vehicle number recognition device comprising a vehicle number identification unit that stores and manages a preset vehicle number pattern, compares the combination pattern of letters and numbers with the vehicle number pattern, and obtains and outputs the vehicle number only when they match. 6. The method of claim 5,
After extracting the region of interest in which the license plate is photographed from the vehicle image, the vehicle number recognition device further comprising a region of interest extracting unit providing only the image of the region of interest to the text recognition unit. 7. The method of claim 6,
After distinguishing the vehicle type by comparing the image characteristics of the region of interest and the license plate, and after identifying the letters or numbers that can be manipulated, at least one of the vehicle number recognition result, the vehicle type, and the letters or numbers with the possibility of manipulation Vehicle number recognition device, characterized in that it further comprises an additional information providing unit for generating and providing including a.

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