(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點實驗室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083)
摘 要: 根據(jù)JPEG壓縮原理，引入塊偽影柵格、編碼塊后驗概率以及ASAD等多種篡改探測方法，并將其應(yīng)用于數(shù)字化成果地質(zhì)資料的真?zhèn)螜z測。這些方法對于復(fù)制−粘貼、噴繪、填涂等篡改檢測均為有效，且可以實現(xiàn)被篡改區(qū)域的定位。論文分別對不同的檢測算法進行了驗證和對比分析。實驗結(jié)果表明：這些方法可有效應(yīng)用于數(shù)字地質(zhì)資料的篡改檢測，從而進一步服務(wù)于地質(zhì)資料信息集群化產(chǎn)業(yè)化工作，對海量數(shù)字化成果地質(zhì)資料版權(quán)保護和真實性檢測具有極高的理論和實用價值。
關(guān)鍵字: 篡改探測；JPEG壓縮；數(shù)字地質(zhì)資料
JPEG compression techniques
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:Based on the JPEG compression principle, the three forgery detection methods including block artifact grid (BAG), the block posterior probability map (BPPM) and the averaged sum of absolute difference (ASAD) methods were investigated, and the methods were applied to detecting the authenticity of the digital geological images. These methods are efficient for the detection of copy-paste, inpainting and filling tampered images, and can be used to locate the tampered regions. The efficiency and the detection results of three different tampered region detecting algorithms were verified and analyzed. The experimental results show that these methods can be effectively used for the digital geologic images tampering detection, and hence further the information service for the clustering and industry of digital geological image were provided. Besides, these methods have high theoretical and practical value for the copyright protection and authenticity detection of massive digital geological image.
Key words: forgery detection; JPEG compression; digital geological image
