{"created":"2023-05-15T14:45:08.702651+00:00","id":61693,"links":{},"metadata":{"_buckets":{"deposit":"b8c7ce43-ca62-4ec2-94b5-bedb5b4cf778"},"_deposit":{"created_by":1,"id":"61693","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"61693"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00061693","sets":["10:29"]},"author_link":["610793","610792","610797","610790","610796","610788","610794","610795","610791","610789"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2006-07-22","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"　JPEG、JPEG2000で圧縮された画像は、通常のウェブブラウザで表示できる。圧縮時に、DCT（Discrete Cosine Transform）係数、DWT(Discrete Wavelet Transform）係数に患者情報等の画像付帯情報を埋め込む方法を考案した。秘密キーで暗号化すれば、改竄検出もできる。512×512画素のX線画像とCT画像を用い、埋め込みによる画像劣化を目視とPSNRで評価した。DCT法ではブロッキングノイズとして認められ、DWT法では、境界不鮮明なpatchy shadowとして認められた。DCT法、DWT法とも、係数への操作量が大きくなれば、PSNRは低下し、埋め込んだ透かしの検出率が上昇した。一方で、DCT法では係数による違いはなく、DWT法ではサブバンドが高次ほど保たれた。また、DCT法は，JPEG圧縮に対して耐性を持つが、JPEG2000圧縮への耐性を持たず、DWT法は、JPEG圧縮・JPEG2000圧縮いずれに対しても耐性を持つことがわかった。","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"第25回日本医用画像工学会大会","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"塚本, 信宏"}],"nameIdentifiers":[{"nameIdentifier":"610788","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"安藤, 裕"}],"nameIdentifiers":[{"nameIdentifier":"610789","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"中島, 祥次"}],"nameIdentifiers":[{"nameIdentifier":"610790","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"水野, 洋輔"}],"nameIdentifiers":[{"nameIdentifier":"610791","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"西尾, 将人"}],"nameIdentifiers":[{"nameIdentifier":"610792","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"川嶋, 弘尚"}],"nameIdentifiers":[{"nameIdentifier":"610793","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"澤田, 裕久"}],"nameIdentifiers":[{"nameIdentifier":"610794","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"橋本, 禎介"}],"nameIdentifiers":[{"nameIdentifier":"610795","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"塚本 信宏","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"610796","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"安藤 裕","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"610797","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"JPEG、JPEG2000圧縮を利用したDigital water mark","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"JPEG、JPEG2000圧縮を利用したDigital water mark"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2006-07-25"},"publish_date":"2006-07-25","publish_status":"0","recid":"61693","relation_version_is_last":true,"title":["JPEG、JPEG2000圧縮を利用したDigital water mark"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T21:39:24.078949+00:00"}