著者

多谷 邦彦 竹田 直人 小林 正 尾崎 吉明 黒木 修隆

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. C (ISSN:03854221)

巻号頁・発行日

vol.137, no.5, pp.742-749, 2017

被引用文献数

4

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<p>Today we can take many pictures with smart phones or digital cameras, and can edit them easily by ourselves. These pictures are very useful not only for hobby, but for investigation. It is very important to check whether they are doctored or not. This paper proposes an automatic detection method of doctored JPEG images based on two different analyisis: the block noise analysis and the Double-JPEG analysis. Former can find unnatural boundaries of 8×8 DCT blocks while latter can find double saved images by other editing software. Finally SVM classifies images into doctored and undoctored groups based on the above analysis. Experimental results have shown that the detection accuracy of our method achieves 0.90 in terms of F-measure while J. He's method achieves 0.82.</p>

著者

金森 仁志 浅井 義行 若江 祐子 窪田 英明 尾崎 吉明 松本 政雄

出版者

THE SOCIETY OF PHOTOGRAPHY AND IMAGING OF JAPAN

雑誌

日本写真学会誌 (ISSN:03695662)

巻号頁・発行日

vol.66, pp.96-97, 2003

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Theoretical and experimental approaches for edge enhancement effect of vision on an X-ray radiographic image were carried out. Psychophysically enhanced portions in density unit at the both sides of a step edge image were derived from MTF's of vision and radiographic systems. Experimantal values were obtained using our new method. Experimental values distributed around theoretical values, and their qualitative behaviour was similar to that of theoretical values. Discrepancy between theoretical and experimental results dues to nonlinearity of human visual system.