KR20100087816A - A realtime robust watermarking and image compression technique for the medical image - Google Patents

A realtime robust watermarking and image compression technique for the medical image Download PDF

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KR20100087816A
KR20100087816A KR1020090006813A KR20090006813A KR20100087816A KR 20100087816 A KR20100087816 A KR 20100087816A KR 1020090006813 A KR1020090006813 A KR 1020090006813A KR 20090006813 A KR20090006813 A KR 20090006813A KR 20100087816 A KR20100087816 A KR 20100087816A
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image
jpeg
medical image
medical
watermarking
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KR1020090006813A
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Korean (ko)
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임성진
반성범
정용화
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조선대학교산학협력단
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
    • G06F21/16—Program or content traceability, e.g. by watermarking
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H30/00—ICT specially adapted for the handling or processing of medical images
    • 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
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • 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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/467—Embedding additional information in the video signal during the compression process characterised by the embedded information being invisible, e.g. watermarking

Abstract

PURPOSE: A real time robust watermarking and an image compression technique are provided to prevent illegal usage of an medical image by using digital watermarking. CONSTITUTION: An image compression technology protects an medical image and process a digital watermarking technology and a JPEG 2000 compression technology in real time. The image compression technology help a user to easily manage the medical image. The watermark is inserted and extracted by using the digital watermarking technology.

Description

의료 영상에 적용하는 실시간 디지털 워터마킹과 영상 압축 기술 {A Realtime Robust Watermarking and Image Compression Technique for the Medical Image}A Realtime Robust Watermarking and Image Compression Technique for the Medical Image

본 발명은 의료 영상의 보호와 관리에 관한 것으로, 기존의 필름 대신 디지털 영상으로 의료 영상이 만들어지고 있다. 이러한 의료 영상이 불법 사용자로부터 변형될 수 있다는 문제점과 많은 정보량을 가지고 있어서 효율적인 관리를 하지 못하는 경우가 있는데 이를 해결하는 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the protection and management of medical images, in which medical images are made of digital images instead of conventional films. There is a problem that such a medical image can be transformed from an illegal user and a large amount of information cannot be managed efficiently.

의료분야의 전산화와 병원간의 원격 진료를 위해 PACS(Picture Archiving and Communication System)가 도입되었다. PACS은 의료 영상을 획득하여 기존의 필름 대신 디지털 영상으로 저장, 관리 그리고 전송을 가능하게 하는 시스템이다. 이로 인해, 많은 정보량을 가지고 있는 의료 영상의 압축 및 보호에 대한 관심이 증가하고 있다. 하지만 PACS는 영상의 복제, 변조 그리고 삭제 등을 쉽게 함으로써, 불법 사용자로 인한 의료 영상이 변형될 수 있다는 문제점을 가지고 있다. 또한, 정보량이 많은 의료 영상은 효율적인 전송이나 저장을 위해 데이터 압축이 필요하 다.The PACS (Picture Archiving and Communication System) was introduced for computerization in the medical field and telemedicine between hospitals. PACS is a system for acquiring medical images and storing, managing and transmitting them as digital images instead of conventional film. For this reason, there is a growing interest in the compression and protection of medical images having a large amount of information. However, PACS has a problem that medical images due to illegal users may be modified by easily copying, modulating and deleting images. In addition, medical images with a large amount of information require data compression for efficient transmission or storage.

본 발명은 상술한 결점을 해결하기 위하여 안출한 것으로, 의료 영상의 많은 정보량을 영상 압축으로 전송이나 저장 시에 용이하게 하는데 그 목적이 있다. 그리고 디지털 워터마킹을 이용함으로써 불법 사용자로부터 의료 영상의 무결성을 보장하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawback, and an object thereof is to facilitate a large amount of information of a medical image during transmission or storage by image compression. In addition, the purpose of the digital watermarking to ensure the integrity of the medical image from illegal users.

본 발명은 의료 영상에 JPEG 2000 압축 기법을 이용하는데 그 도중에 디지털 워터마킹 기술을 삽입한다. 의료 영상을 JPEG 2000 압축 인코딩하는 제 1단계; 다시 역으로 의료 영상을 JPEG 2000 압축 디코딩하는 제 2단계로 이루어진다.The present invention uses JPEG 2000 compression technique for medical images, in which a digital watermarking technique is inserted. A first step of compressing and encoding JPEG 2000 medical images; Conversely, a second step of JPEG 2000 compression decoding the medical image is performed.

상술한 바와 같이 본 발명은 의료 영상에 JPEG 2000 압축과 디지털 워터마킹을 실시간으로 수행한다. 이는 디지털 워터마킹으로 의료 영상의 무결성을 보장하며 영상 압축으로 의료 영상의 관리를 용이하게 한다. 그리고 실시간으로 영상 압축과 디지털 워터마킹 기술이 수행되므로 의료 영상을 다루는 시간이 단축된다. As described above, the present invention performs JPEG 2000 compression and digital watermarking on a medical image in real time. This ensures the integrity of medical images with digital watermarking and facilitates the management of medical images with image compression. And since image compression and digital watermarking technology are performed in real time, the time for handling medical images is reduced.

이하, 첨부된 도면을 참조하여 본 발명에 따른 실시 예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 의료 영상의 보호와 관리를 위한 방법으로 시스템의 일 실시예를 나타낸 블록도이다. 의료 영상의 입력, JPEG 2000의 압축, 디지털 워터마킹, 영상 출력으로 이루어진다. 본 시스템은 크게 인코딩 과정과 디코딩 과정으로 나누어질 수 있다.1 is a block diagram illustrating an embodiment of a system as a method for protecting and managing a medical image according to the present invention. Medical image input, JPEG 2000 compression, digital watermarking, and image output. The system can be divided into encoding process and decoding process.

도 2는 본 발명에 따른 JPEG 2000의 인코딩 과정의 일 실시예를 단계별로 나타낸 순서도이다. 인코딩 과정은 의료 영상를 압축하는 과정이다. 2 is a flowchart showing step by step an embodiment of an encoding process of JPEG 2000 according to the present invention. The encoding process is a process of compressing a medical image.

JPEG 2000은 웨이블렛 변환을 기반으로 영상 압축을 한다. JPEG 2000 인코딩 과정은 전처리(Preprocessing), 웨이블렛 변환(Forward wavelet transform), 양자화(Quantization), 그리고 엔트로피 인코딩(Entropy encoding) 과정으로 이루어져 있다. 또 본 시스템에서 사용하는 디지털 워터마킹 기술은 Dugad 워터마킹 기술은 웨이블렛 변환를 이용하는 대표적인 Robust 워터마킹 알고리즘이다. 따라서 JPEG 2000 인코딩 과정 중에서 웨이블렛 변환 후에 Dugad 워터마킹 기술을 추가하여 워터마크를 삽입한다. 그 이후의 JPEG 2000 인코딩 과정을 따른다. JPEG 2000 performs image compression based on wavelet transform. The JPEG 2000 encoding process consists of preprocessing, forward wavelet transform, quantization, and entropy encoding. In addition, the digital watermarking technology used in this system, Dugad watermarking technology is a representative Robust watermarking algorithm using wavelet transform. Therefore, after wavelet conversion in JPEG 2000 encoding process, Dugad watermarking technology is added to insert watermark. It then follows the JPEG 2000 encoding process.

도 3은 본 발명에 따른 JPEG 2000의 디코딩 과정의 일 실시예를 단계별로 나타낸 순서도이다. JPEG 2000 디코딩 과정은 인코딩 과정의 역순으로 이루어진다.3 is a flowchart illustrating step by step an embodiment of a decoding process of JPEG 2000 according to the present invention. The JPEG 2000 decoding process is the reverse of the encoding process.

JPEG 2000 디코딩 과정은 엔트로피 디코딩(Entropy decoding), 역양자화(Dequantization), 역웨이블렛 변환(Inverse wavelet transform), 그리고 후처리(Postprocessing) 과정으로 이루어져 있다.JPEG 2000의 디코딩 과정 중에서 역웨이블렛 변환 과정 전에 Dugad 워터마킹 기술을 추가하여 워터마크를 추출한 이후 역웨이블렛 변환을 한다. 그 이후의 JPEG 2000 디코딩 과정을 따른다.The JPEG 2000 decoding process consists of entropy decoding, dequantization, inverse wavelet transform, and postprocessing. Watermarking is added to extract the watermark and then reverse wavelet transformed. Then follow the JPEG 2000 decoding process.

예로, 원본 영상이 257KB 크기를 가진다. 하지만 본 시스템을 적용하여 압축한 결과 52KB 크기를 가진다. 원본 영상과 시스템을 적용한 결과 영상에 대한 PSNR(Peak Signal to Noise Ratio)는 39.10[dB]로 인간의 시작으로 구별이 불가능하다는 것을 알 수 있다. 워터마크 검출률은 워터마킹만을 적용한 결과 영상에서는 80.23[%], 본 시스템을 적용한 결과 영상에서는 79.21[%] 정도이다. 워터마킹을 적용한 것 보다는 조금 낮게 나왔지만, 본 시스템은 워터마킹과 영상 압축을 실시간으로 수행한다는 것이 중요한 요점이며, 이 관점에서 보면 좋은 결과라 할 수 있다. 또한, 워터마킹 기술과 JPEG 2000 기술을 각각 수행하면 총 걸린 시간은 1.11초 걸린다. 본 시스템은 이 두 기술을 실시간으로 처리하므로 수행 시간은 0.72초로 수행 시간이 0.39초 단축되는 것을 알 수 있다.For example, the original image has a size of 257KB. However, after applying this system, it has a size of 52KB. As a result of applying the original image and the system, the peak signal to noise ratio (PSNR) of the image is 39.10 [dB]. The watermark detection rate is about 80.23 [%] in the resultant image of watermarking only and 79.21 [%] in the resultant image of this system. Although it came out a little lower than watermarking, the important point is that the system performs watermarking and image compression in real time, and it is a good result from this point of view. In addition, the watermarking technique and the JPEG 2000 technique each take 1.11 seconds. Since the system processes these two technologies in real time, the execution time is 0.72 seconds and the execution time is reduced by 0.39 seconds.

도 1은 본 발명에 따른 의료 영상의 보호와 관리를 위한 방법을 나타낸 블록도, 1 is a block diagram showing a method for protection and management of a medical image according to the present invention;

도 2는 본 발명에 따른 인코딩 과정을 나타낸 블록도,2 is a block diagram showing an encoding process according to the present invention;

도 3은 본 발명에 따른 디코딩 과정을 나타낸 블록도.3 is a block diagram illustrating a decoding process according to the present invention.

Claims (3)

의료 영상의 보호와 관리하는 방법에 있어서,In the method of protecting and managing medical images, 디지털 워터마킹 기술과 JPEG 2000 압축 기술을 실시간으로 처리하여 의료 영상의 무결성과 용이한 관리를 할 수 있는 방법.Digital watermarking technology and JPEG 2000 compression technology can be processed in real time for the integrity and easy management of medical images. 제 1항에서 의료 영상을 JPEG 2000 압축 인코딩하는 과정에서 디지털 워터마킹 기술을 이용하여 워터마크를 삽입하는 방법.The method of claim 1, wherein the watermark is inserted using digital watermarking in the process of JPEG 2000 compression encoding the medical image. 제 2항에서 결과 영상으로 압축된 의료 영상에 대해 다시 역으로 JPEG 2000 압축 디코딩하는 과정에서 디지털 워터마킹 기술을 이용하여 워터마크를 추출하는 방법.The method of claim 2, wherein the watermark is extracted using digital watermarking technology in the process of performing JPEG 2000 compression decoding on the medical image compressed into the resultant image.
KR1020090006813A 2009-01-29 2009-01-29 A realtime robust watermarking and image compression technique for the medical image KR20100087816A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101456632B1 (en) * 2012-10-25 2014-11-03 경북대학교 산학협력단 Medical image decryption apparatus, medical image decryption method and computer readble recording medium storing thereof
WO2017074017A1 (en) * 2015-10-26 2017-05-04 주식회사 아이알엠 Method for building cloud-based medical image database for protection of patient information and reading medical image therefrom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101456632B1 (en) * 2012-10-25 2014-11-03 경북대학교 산학협력단 Medical image decryption apparatus, medical image decryption method and computer readble recording medium storing thereof
WO2017074017A1 (en) * 2015-10-26 2017-05-04 주식회사 아이알엠 Method for building cloud-based medical image database for protection of patient information and reading medical image therefrom
US11327943B2 (en) 2015-10-26 2022-05-10 Z-Emotion Co., Ltd. Method for building cloud-based medical image database for protection of patient information and reading medical image therefrom
US11893124B2 (en) 2015-10-26 2024-02-06 Irm Inc. Method for building cloud-based medical image database for protection of patient information and reading medical image therefrom

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