KR20100044426A - Pictorial image compression method at camera sensor for monitoring and diagnosising power transmission line - Google Patents

Pictorial image compression method at camera sensor for monitoring and diagnosising power transmission line Download PDF

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KR20100044426A
KR20100044426A KR1020080103559A KR20080103559A KR20100044426A KR 20100044426 A KR20100044426 A KR 20100044426A KR 1020080103559 A KR1020080103559 A KR 1020080103559A KR 20080103559 A KR20080103559 A KR 20080103559A KR 20100044426 A KR20100044426 A KR 20100044426A
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image
sub
images
transmission line
monitoring
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KR1020080103559A
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Korean (ko)
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박창선
명희철
민병운
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현대중공업 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/45—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images

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  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

PURPOSE: A pictorial image compression method of a camera sensor for monitoring and diagnosing a power transmission line is provided to not damage pictorial data of an accurate part with a good compression rate. CONSTITUTION: A pictorial image compression method of a camera sensor for monitoring and diagnosing a power transmission line comprises the first step and the second step. Four sub images are generated by down-sampling by applying a low pass filter and a high pass filter to each row of a 2D pictorial image in the first step. Separating procedures for sub images of low and high frequency areas are differently applied in the four sub images and the pictorial images are compressed in the second step. An image which separates a sub image of a high frequency area with a severe change from the four sub images is generated in the four sub images in the second step. Moreover, the image of the second step and the separated image are compressed together while a sub image of a low frequency area with a not severe change in the four sub images is not separated.

Description

송전선로 감시진단용 카메라센서의 화상 이미지 압축방법{Pictorial image compression method at camera sensor for monitoring and diagnosising power transmission line}Image image compression method at camera sensor for monitoring and diagnosising power transmission line}

본 발명은 송전선로 중간에 설치되어 송전선로 이상 유무와 송전선로 주변을 감시하고 진단하는 장치에 관한 것으로, 보다 상세하게는 카메라 센서에 의해 촬영된 영상을 웨이블렛 기술로 압축하여 전송할 수 있도록 하는 송전선로 감시진단용 카메라센서의 화상 이미지 압축방법에 관한 것이다.The present invention relates to a device installed in the middle of a transmission line for monitoring and diagnosing a transmission line abnormality and the vicinity of the transmission line, and more particularly, a transmission line for compressing and transmitting an image captured by a camera sensor using a wavelet technology. The present invention relates to a method for compressing an image image of a camera sensor for monitoring diagnosis.

송전선로 주변 감시를 위한 선로 이상 감시 기술은 현재 선로의 온도 감시 또는 단선 감시 등의 방법이 일부 적용되고 있다.The line fault monitoring technology for monitoring the transmission line is currently partially applied to line temperature monitoring or disconnection monitoring.

그러나 선로의 온도 뿐만 아니라 변형도 함께 감시하는 기술은 적용되고 있지 않는 실정이다. 선로의 변형과 온도를 동시에 감시하게 되면 물리적인 선로 변형에 따른 단선 또는 화재 발생을 사전에 방지할 수 있는 유효한 방법을 제공할 수 있다.However, technology that monitors not only the temperature of the line but also the deformation is not applied. Simultaneous monitoring of line strain and temperature can provide an effective way to prevent breakage or fire from physical line strain.

도 1은 송전선로의 주변 감시에 적용되는 볼센서의 개략도를 설명하고 있다.1 illustrates a schematic diagram of a ball sensor applied to the perimeter monitoring of a transmission line.

볼센서(100)는 각 송전선에 부착되어 선로의 온도뿐만 아니라 변형도 함께 감시한다. 상기 볼센서(100)의 내부는 도면에 표시하지 않았지만 전류 센서, 기울기 센서, 풍향/풍속 센서, 온도 센서 등의 센서들이 부착되어 송전선의 변형 정도를 통신으로 전송하며, 특히 볼센서(100)의 하단에 송전선로 주변 감시를 위한 카메라 센서(101)를 장착하여 송전선로 주변의 화재 여부, 수풀의 우거짐으로 인한 송전선 방해 여부, 환경의 악조건 상태 파악, 애자의 부식상태 등의 주변 감시를 한다.The ball sensor 100 is attached to each transmission line to monitor the deformation as well as the temperature of the line. Although the inside of the ball sensor 100 is not shown in the drawings, sensors such as a current sensor, a tilt sensor, a wind direction / wind sensor, a temperature sensor, and the like are attached to transmit a degree of deformation of a transmission line through communication, and in particular, of the ball sensor 100 The camera sensor 101 for monitoring the transmission line surroundings is mounted at the bottom to monitor the surroundings such as whether there is a fire around the transmission line, whether the transmission line is disturbed due to the lump of the bush, the environmental condition of the environment, or the corrosion state of the insulator.

이때, 상기 카메라 센서(101)의 화상(정지영상)은 통신을 통하여 사용자가 확인할 수 있어야 한다.At this time, the image (still image) of the camera sensor 101 should be confirmed by the user through communication.

그러나, 상기 카메라 센서(101)는 다른 센서류와 비교하여 전력소비가 심할 뿐 아니라 화상 이미지는 용량이 매우 크기 때문에 전송 시간이 오래 걸리며, 저장공간도 많이 필요하게 되고, 통신 버퍼의 크기도 커야 되는 등 여러 문제점을 가지고 있다.However, the camera sensor 101 not only consumes more power than other sensors, but also requires a long transmission time due to its large capacity, requires a lot of storage space, and a large size of the communication buffer. There are several problems.

따라서, 화상 이미지의 손실은 최소화 하면서 용량을 줄일 수 있는 압축기법을 반드시 적용되어야 한다.Therefore, a compression method must be applied which can reduce the capacity while minimizing the loss of the image.

현재 이미지 데이터의 압축기법으로써는 JPEG 기법을 많이 사용하고 있지만, 이는 일반 PC급에서 사용하는 상용 기법으로 특수한 환경에 있는 볼센서(100)에 적용하기에는 데이터 용량 측면에서 무리가 있다.Currently, JPEG is widely used as a compression method of image data, but this is a commercial technique used in a general PC class, and it is unreasonable in terms of data capacity to be applied to the ball sensor 100 in a special environment.

즉, 현재 화상 압축기법으로 널리 사용되고 있는 JPEG의 압축기법은 첨부된 도 2에서와 같은 일반적인 분해방법으로, 이는 2차원 화상 이미지의 각 행에 저역통과필터(L)와 고역통과필터(H)를 적용하여 특정영역(LL,LH,HL,HH)에 해당하는 4개 의 서브이미지를 생성하는 한편, 상기 특정영역(LL,LH,HL,HH)에 해당하는 4개의 서브이미지를 재차 분해하여 압축(LLL,LLH,…,HHL,HHH)시키는 한편, 상기 압축이 이루어지는 특정영역(LLL,LLH,…,HHL,HHH)들의 화상이미지를 복원할 수 있도록 한 것이며, 이는 약 20:1 정도의 압축률을 가지게 된다.In other words, the JPEG compression method, which is widely used as the image compression method, is a general decomposition method as shown in FIG. 2, which includes a low pass filter (L) and a high pass filter (H) in each row of a two-dimensional image. 4 sub-images corresponding to the specific area (LL, LH, HL, HH) are generated, and 4 sub-images corresponding to the specific area (LL, LH, HL, HH) are decomposed and compressed again. (LLL, LLH,…, HHL, HHH), while reconstructing the image image of the specific regions (LLL, LLH,…, HHL, HHH) where the compression is performed, which has a compression ratio of about 20: 1. Will have

그러나, 송전선에 직접 장착되어 하단의 환경과 많은 거리를 두고 있는 볼센서(100)인 점을 감안할 때, 상기 볼센서(100)에 탑재된 카메라 센서(101)에 의해 촬영되는 화상 이미지(정지영상)를 JPEG로 압축할 때 화상 이미지의 정교한 부분(고주파영역)에 대한 표현이 불분명하게 나타나는 문제점이 있다.However, in view of the fact that the ball sensor 100 is mounted directly on the power transmission line and has a large distance from the environment below, an image image (still image) captured by the camera sensor 101 mounted on the ball sensor 100. ), There is a problem in that the representation of the elaborate portion (high frequency region) of the image image is unclear when compressed into JPEG.

또한, 상기의 JPEG 압축기법은 화상이미지의 분해가 고주파영역은 물론 압축시 데이터 손실이 거의 발생하지 않는 저주파영역에서도 동시에 이루어지는 바, 이는 분해에 따른 계산량이 증가되어 압축시간이 길어지는 단점이 있음은 물론, 압축률이 저하되는 문제점이 있다.In addition, the JPEG compression method is performed at the same time in the high frequency region as well as in the low frequency region in which data loss is hardly generated during compression. This has a disadvantage in that the compression time is increased due to an increase in calculation amount due to decomposition. Of course, there is a problem that the compression ratio is lowered.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출된 것으로서, 압축률은 좋으면서도 정교한 부분의 화상의 데이터는 손상시키지 않도록 웨이블렛(wavelet)을 이용하는 송전선로 감시진단용 카메라센서의 화상 이미지 압축방법을 제공하려는데 그 목적이 있다.Accordingly, the present invention has been made to solve the above-mentioned conventional problems, the image compression method of the image sensor of the transmission line monitoring diagnostic camera sensor using a wavelet (wavelet) so as not to damage the data of the image of the fine portion with a good compression ratio The purpose is to provide.

상기 목적 달성을 위한 본 발명 송전선로 감시진단용 카메라센서의 화상 이미지 압축 방법은, 2차원 화상 이미지의 각 행에 저역통과필터와 고역통과필터를 적용하여 다운 샘플링으로 4개의 서브이미지를 생성하는 제 1 단계; 및, 상기 4개의 서브이미지에서 저주파영역의 서브이미지와 고주파영역의 서브이미지에 대한 분해의 처리절차를 서로 다르게 적용한 후 압축하는 제 2 단계; 를 포함한다.The image image compression method of the transmission line monitoring diagnostic camera sensor of the present invention for achieving the above object, the first to generate four sub-images by down-sampling by applying a low pass filter and a high pass filter to each row of the two-dimensional image image step; And a second step of compressing the four sub-images after applying different processing procedures for the sub-images in the low frequency region and the sub-images in the high frequency region. It includes.

또한, 상기 제 2 단계는, 상기 제 1 단계로부터 생성되는 4개의 서브이미지에서 변화가 심한 고주파영역의 서브이미지를 재차 분해시킨 이미지를 생성하는 단계; 및, 상기 제 1 단계로부터 생성되는 4개의 서브이미지에서 변화가 심하지 않은 저주파영역의 서브이미지를 분해하지 않은 상태로, 상기 단계로부터 생성되는 분해 이미지와 함께 압축하는 단계; 를 포함한다.In addition, the second step may include generating an image of re-decomposing the sub-image of the high frequency region which is highly changed in the four sub-images generated from the first step; And compressing the sub-image of the low frequency region in which the change is not severe in the four sub-images generated from the first step with the disassembled image generated from the step without decomposing the sub-images. It includes.

이 같은 본 발명은 웨이블렛의 압축기법을 사용하여 동일한 계산량에서도 압축률을 높이고, 고주파 영역에서의 정교한 부분에 대한 화상 데이터의 손상을 방지 하면서 급격이 변화하는 화상 이미지에 대한 압축 후의 화질을 향상시켜, 카메라센서에 의한 송전선로 주변의 화재 여부, 수풀의 우거짐으로 인한 송전선 방해 여부, 환경의 악조건 상태 파악, 애자의 부식상태 등의 주변 감시를 보다 세밀하게 추진하는 효과를 얻을 수 있는 것이다.The present invention uses the wavelet compressor method to increase the compression ratio even at the same calculation amount, and to improve the image quality after compression for a rapidly changing image image while preventing damage to the image data for a precise portion in the high frequency region. It is possible to obtain the effect of more closely monitoring the surroundings such as whether the fire is around the transmission line by the sensor, whether the transmission line is disturbed due to the dense bush, the environmental condition of the environment, and the corrosion state of the insulator.

이하, 첨부된 도면에 의하여 본 발명의 실시예를 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

도 3은 본 발명의 실시예로 송전선로 감시진단용 카메라센서의 화상 이미지를 웨이블렛으로 압축하는 방법을 보인 흐름도를 도시한 것이다.3 is a flowchart illustrating a method of compressing an image image of a transmission line monitoring diagnostic camera sensor into a wavelet according to an embodiment of the present invention.

첨부된 도 3에서와 같이, 본 발명의 실시예에 따른 화상이미지의 압축은 주파수와 시간의 양 측면에서 분석하여 기저 함수를 찾아내고 이 기저 함수의 성질을 불변으로 하지 않고 주파수가 높은 영역에서는 주기가 짧은 기저를 사용하여 시간에 관한 분해능을 높이고, 주파수가 낮은 영역에서는 주기가 긴 기저를 사용하여 주파수에 관한 분해능을 높여서 주파수의 높낮이에 적절히 분해능을 조절하는 웨이블렛 압축 기법을 적용한 것이다.As shown in FIG. 3, the compression of an image image according to an embodiment of the present invention analyzes both aspects of frequency and time to find a base function, and a period in a high frequency region without changing the properties of the base function. The wavelet compression technique is used to increase the resolution over time by using a short basis and to adjust the resolution appropriately at the height of the frequency by using a long period basis in the low frequency region.

즉, 첨부된 도 3에서와 같이, 2차원의 이미지의 각 행에 저역통과필터(L)와 고역통과필터(H)를 적용시킨 상태에서, 상기 저역통과필터(L)와 고역통과필터(H)가 다운 샘플링을 수행하여 저역(LL), 저,고역(LH), 고,저역(HL), 그리고 고역(HH)의 영역에 해당하는 4개 서브이미지를 생성한다.That is, as shown in FIG. 3, in the state where the low pass filter L and the high pass filter H are applied to each row of the two-dimensional image, the low pass filter L and the high pass filter H are applied. ) Performs downsampling to generate four sub-images corresponding to the regions of low frequency (LL), low frequency, high frequency (LH), high frequency, low frequency (HL), and high frequency (HH).

이때, 상기 생성된 특정영역(LL,LH,HL,HH)에 해당하는 4개의 서브이미지에서, 저주파영역(LL,LH,HL)의 서브이미지는 변화가 심하지 않은 부분이기 때문에 압 축을 하여도 손실이 거의 없는 부분이다.In this case, in the four sub-images corresponding to the generated specific regions LL, LH, HL, and HH, the sub-images of the low frequency regions LL, LH, and HL are not changed much, and thus are lost even when compressed. This is almost no part.

따라서, 상기 저주파영역(LL,LH,HL)의 서브이미지는 분해를 하지 않고 바로 압축이 이루어지도록 한다.Therefore, the sub-images of the low frequency regions LL, LH, and HL are compressed immediately without decomposition.

한편, 상기 생성된 4개 영역(LL,LH,HL,HH)의 서브이미지에서, 고주파영역(HH)의 서브이미지는 변화가 매우 심한 부분이기 때문에 분해하지 않고 바로 압축을 하게 되면 손실이 많이 일어나게 된다.Meanwhile, in the generated sub-images of the four regions LL, LH, HL, and HH, since the sub-images of the high-frequency region HH are very changeable parts, if the compression is performed immediately without disassembling, a lot of loss occurs. do.

이에따라, 상기 고주파영역(HH)의 서브이미지는 계속적으로 분해를 실시하게 되며, 이때 상기 분해되는 고주파영역(HHL,HHH)의 이미지들과 상기 분해가 이루어지지 않은 저주파영역의 서브이미지(LL,LH,HL)을 압축하게 되면, 상기 압축된 화상이미지를 역웨이브렛을 통해 복원시 고주파영역에서의 이미지 데이터에 대한 손상을 방지하여 복원 후의 화상 이미지에 대한 화질을 높일 수 있고, 화상 이미지에 대한 웨이블렛의 압축 시간 단축과 압축률을 높일 수 있는 것이다.Accordingly, the sub-images of the high frequency region HH are continuously decomposed, and at this time, the images of the decomposed high frequency region HHL and HHH and the sub-images of the low frequency region where the decomposition is not made are LL and LH. When HL) is compressed, it is possible to prevent damage to the image data in the high frequency region when restoring the compressed image image through a reverse wavelet, thereby improving the image quality of the image image after the restoration, and the wavelet for the image image. This will shorten the compression time and increase the compression rate.

이하, 본 발명은 상술한 특정의 바람직한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능한 것은 물론이고, 그와같은 변경은 청구범위 기재의 범위내에 있게 된다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that such changes and modifications are within the scope of the claims.

도 1은 일반적인 송전선로 감지장치의 구성도.1 is a configuration diagram of a general transmission line detection device.

도 2는 종래 JPEG의 압축 흐름도.2 is a compression flowchart of a conventional JPEG.

도 3은 본 발명의 실시예로 송전선로 감시진단용 카메라센서의 화상 이미지를 웨이블렛으로 압축하는 방법을 보인 흐름도.3 is a flowchart illustrating a method of compressing an image image of a transmission line monitoring diagnostic camera sensor into a wavelet according to an embodiment of the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

100; 볼센서 101; 카메라센서100; Ball sensor 101; Camera sensor

Claims (2)

2차원 화상 이미지의 각 행에 저역통과필터와 고역통과필터를 적용하여 다운 샘플링으로 4개의 서브이미지를 생성하는 제 1 단계; 및,A first step of generating four sub-images by down sampling by applying a low pass filter and a high pass filter to each row of the two-dimensional image image; And, 상기 4개의 서브이미지에서 저주파영역의 서브이미지와 고주파영역의 서브이미지에 대한 분해의 처리절차를 서로 다르게 적용한 후 압축하는 제 2 단계; 를 포함하여 진행하는 것을 특징으로 하는 송전선로 감시진단용 카메라센서의 화상 이미지 압축 방법.A second step of compressing the four sub-images after applying different processing procedures for the sub-images in the low frequency region and the sub-images in the high frequency region; Image image compression method of the camera sensor for monitoring the transmission line, characterized in that proceeding including. 제 1 항에 있어서, 상기 제 2 단계는,The method of claim 1, wherein the second step, 상기 제 1 단계로부터 생성되는 4개의 서브이미지에서 변화가 심한 고주파영역의 서브이미지를 재차 분해시킨 이미지를 생성하는 단계; 및,Generating an image obtained by re-decomposing the sub-image of the high frequency region having a high change in the four sub-images generated from the first step; And, 상기 제 1 단계로부터 생성되는 4개의 서브이미지에서 변화가 심하지 않은 저주파영역의 서브이미지를 분해하지 않은 상태로, 상기 단계로부터 생성되는 분해 이미지와 함께 압축하는 단계; 를 더 포함하여 진행하는 것을 특징으로 하는 송전선로 감시진단용 카메라센서의 화상 이미지 압축 방법.Compressing the sub-image of the low frequency region in which the change is not severe in the four sub-images generated from the first step with the disassembled image generated from the step without decomposing; Image image compression method of the transmission line monitoring diagnostic camera sensor further comprising a.
KR1020080103559A 2008-10-22 2008-10-22 Pictorial image compression method at camera sensor for monitoring and diagnosising power transmission line KR20100044426A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110853307A (en) * 2019-10-18 2020-02-28 深圳供电局有限公司 Laser monitoring method and monitoring device for power transmission channel external broken environment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110853307A (en) * 2019-10-18 2020-02-28 深圳供电局有限公司 Laser monitoring method and monitoring device for power transmission channel external broken environment

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