Patents by Inventor Shohei Nakagata
Shohei Nakagata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7848591Abstract: An image processing apparatus includes a target-area setting unit that sets, in image data, an area around a target pixel as a target area, and an overshoot-undershoot suppressing unit that corrects a pixel value of the target pixel in the image data after processing based on pixel values of pixels in the target area.Type: GrantFiled: December 20, 2006Date of Patent: December 7, 2010Assignee: Fujitsu LimitedInventors: Shohei Nakagata, Kensuke Kuraki, Kohji Yamada
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Publication number: 20100158383Abstract: A marker attaching apparatus attaches to an image a positioning marker for detecting a specific area in the image, and includes: an area size detection unit detecting a size of an area to which the positioning marker is attached; a marker adjustment unit adjusting the positioning marker depending on the detected size of the area; and a marker attaching unit attaching the adjusted positioning marker to the image.Type: ApplicationFiled: December 14, 2009Publication date: June 24, 2010Applicant: FUJITSU LIMITEDInventors: Kensuke KURAKI, Shohei Nakagata, Jun Takahashi, Taizo Anan
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Publication number: 20100074443Abstract: Input data is converted into an image, and in the input image, an encryption region that is a region in which the image is to be encrypted. Meanwhile, on the basis of an encryption key, encryption key-related information that is information related to the encryption key is generated, and the encryption key-related information is embedded into the image in the encryption region, to generate a first intermediate image. Next, the first intermediate image is converted on the basis of the encryption key, to generate a second intermediate image. Then, the pixel values of the second intermediate image are converted so that the position of the encryption region can be specified. As a result of the conversion, an encrypted image in which the part corresponding to the encryption region in the input image is generated.Type: ApplicationFiled: November 25, 2009Publication date: March 25, 2010Applicant: FUJITSU LIMITEDInventors: Hideaki ISHII, Taizo Anan, Kensuke Kuraki, Shohei Nakagata
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Publication number: 20100067706Abstract: An encrypting device generates an encrypted image by converting an image of a specified region in an input image with an encryption key, by embedding information obtained by encrypting the encryption key with a public key pairing with the private key of a destination, and by performing pixel value conversion. Then, the encrypted image is transmitted to the destination as a printed matter or via a network. A decrypting device converts the encrypted image in the form of print data or electronic data into an image, and inputs it. Next, the decrypting device extracts a decryption key (the encryption key) from the image of the encryption region by executing a process reverse to that of the encrypting device for the encryption region of the converted encrypted image. Then, the decrypting device decrypts the original image of the encrypted region by using the decryption key, and restores the entire encrypted image.Type: ApplicationFiled: November 23, 2009Publication date: March 18, 2010Applicant: FUJITSU LIMITEDInventors: Taizo Anan, Kensuke Kuraki, Shohei Nakagata
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Patent number: 7668392Abstract: A pixel boundary difference detector detects a pixel boundary difference across a pixel boundary on the basis of a difference value between pixel values of adjacent pixels across the pixel boundary on a picture plane of an input image frame, and a predicted pixel value on the pixel boundary predicted from at least a plurality of pixels on one side of the pixel boundary, an accumulator accumulates the pixel boundary differences for one image frame, and a block noise detector detects a block noise on the basis of a result of the accumulation. The accuracy of block noise detection is improved, the effect of block noise reduction is improved, and the picture quality is improved.Type: GrantFiled: August 1, 2006Date of Patent: February 23, 2010Assignee: Fujitsu LimitedInventors: Kohji Yamada, Shohei Nakagata
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Publication number: 20100042828Abstract: An encrypting device encrypts original document data by use of a password of an addressee, thereby generating encrypted document data. A decryption authority changing device, of which operating authority is held by the addressee, generates authority changing information M structured by encrypting the password of the addressee with a password of a proxy, and notifies a decrypting device of the information, of which the operating authority is held by the proxy. The decrypting device decrypts the password of the addressee by employing the password of the proxy, and decrypts the encrypted document data by use of the decrypted password of the addressee.Type: ApplicationFiled: June 1, 2009Publication date: February 18, 2010Applicant: FUJITSU LIMITEDInventors: Motoo MASUI, Hideaki Ishii, Taizo Anan, Jun Takahashi, Kensuke Kuraki, Shohei Nakagata
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Publication number: 20090323950Abstract: An image encryption apparatus encrypts a digital image by specifying a partial region from the digital image, converting the selected partial region into a processing image based on an encryption key, and specifying a position of the partial region by regularly converting a pixel value of the processing image.Type: ApplicationFiled: May 29, 2008Publication date: December 31, 2009Applicant: Fujitsu LimitedInventors: Shohei NAKAGATA, Kensuke Kuraki, Taizo Anan
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Publication number: 20090262931Abstract: In order to encrypt a part of an input image in such a manner that the encrypted part can be located for decryption, means for regularly converting pixel values in the area to be encrypted and generating a pattern unique to the pixel value conversion in order to encrypt the area to be encrypted; means for setting a specified positioning marker for locating an encryption position at two or more of the four corners of the area to be encrypted; and means for setting one or more checking marks for verifying appropriateness of a decrypted image in the encrypted area before the decryption are included.Type: ApplicationFiled: April 17, 2009Publication date: October 22, 2009Applicant: FUJITSU LIMITEDInventors: Shohei Nakagata, Kensuke Kuraki, Taizo Anan
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Publication number: 20090257586Abstract: An image processing apparatus sections an image to be processed into a plurality of blocks, rearranges the blocks into positions specified by an encryption key that uniquely specifies the positions of the blocks in the image, determines a computing method used to convert pixel values of pixels that form a minimum area included in each of the blocks after the blocks are rearranged based on the pixel values of predetermined pixels that do not belong to the minimum area, and converts the pixel values based on the computing method.Type: ApplicationFiled: December 1, 2008Publication date: October 15, 2009Applicant: FUJITSU LIMITEDInventors: Jun Takahashi, Shohei Nakagata, Kensuke Kuraki, Taizo Anan
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Publication number: 20090245511Abstract: In an image encryption apparatus, each of pixel-value inverse-converters applies pixel-value inverse-conversion on an input image in each of previously-encrypted areas. An image combiner superimposes images with inversely-converted pixels in the previously-encrypted areas to the input image to obtain a ready-to-encrypt image. An image encryptor scrambles blocks in the ready-to-encrypt image. A pixel-value converter applies pixel-value conversion on each of scrambled blocks to obtain a multiply-encrypted image. In an image decryption apparatus, a pixel-value inverse-converter applies pixel-value inverse-conversion on each scrambled block in the multiply-encrypted image to obtain a dot-erased image. An image decryptor inversely scrambles the scrambled blocks in the dot-erased image to obtain a decrypted image. Each of pixel-value converters applies pixel-value conversion on the decrypted image in each of previously-encrypted areas.Type: ApplicationFiled: March 19, 2009Publication date: October 1, 2009Applicant: Fujitsu LimitedInventors: Shohei NAKAGATA, Taizo ANAN, Kensuke KURAKI, Jun TAKAHASHI
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Publication number: 20090245513Abstract: In an image encryption apparatus for visually encrypting an input image, an encryption area selector selects an encryption area within an input image including an area to be encrypted. An image converter divides the encryption area into a plurality of blocks. The image converter divides each block of the encryption area into a plurality of sub-blocks. An image converter performs an image conversion including rotation and mirror-reverse in accordance with an encryption key on the image in each sub-block. The image converter scrambles the image on a block-by-block basis in accordance with the encryption key. A pixel value converter converts a pixel value of a minimal area in a block so that a position of the block may be detected.Type: ApplicationFiled: March 26, 2009Publication date: October 1, 2009Applicant: Fujitsu LimitedInventors: Jun Takahashi, Taizo Anan, Kensuke Kuraki, Shohei Nakagata
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Publication number: 20090245512Abstract: A display processor displays on a display screen an encrypted image accepted by an image data acceptor. An encrypted region acquirer extracts encrypted regions contained on the encrypted image. A target region selector or an authorized target region selector selects decryption target regions from among encrypted regions contained in the encrypted image. A decryption order determiner determines a decryption order of the decryption target regions. The display processor displays on the display screen a prompt for inputting a decryption key (or a password) used for decryption of the encrypted image in each of the decryption target regions in accordance with the decryption order. A decryption key acceptor accepts the decryption key input by a decryption user. An image decryptor performs a decryption process on the encrypted image in the decryption target regions in accordance with the decryption order. A decrypted image of each decryption target region is output.Type: ApplicationFiled: March 20, 2009Publication date: October 1, 2009Applicant: Fujitsu LimitedInventors: Motoo MASUI, Taizo ANAN, Kensuke KURAKI, Jun TAKAHASHI, Shohei NAKAGATA
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Publication number: 20090238361Abstract: In an image encryption apparatus, an input processor inputs data of an input image. An encryptor encrypts a part or whole of the data of the input image. A marker generator generates data of a marker indicating an encrypted area. An image saver saves data of a marker-covered image covered with the marker. A marker sticker sticks the marker. An output processor outputs an encrypted image. In an image decryption apparatus, an input processor inputs data of an input image. A marker detector detects a marker and identifies an encrypted area. A decryptor decrypts data in the encrypted area. An image restorer restores data in an area covered with the marker by sticking data of a marker-covered image. An output processor outputs data of a decrypted image.Type: ApplicationFiled: February 26, 2009Publication date: September 24, 2009Applicant: Fujitsu LimitedInventors: Taizo Anan, Shohei Nakagata, Kensuke Kuraki, Jun Takahashi
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Publication number: 20090220076Abstract: When a decrypting apparatus receives an encrypted image, the apparatus detects the state of the encrypted image and determines whether the encrypted image is an image passed through only a digital medium or an analog medium, according to the state of the encrypted image. When the encrypted image is determined to be the image passed through only the digital medium, the decrypting apparatus switches to perform a digital decryption process and, when the encrypted image is determined to be the image passed through the analog medium, the decrypting apparatus switches to perform an analog decryption process.Type: ApplicationFiled: September 25, 2008Publication date: September 3, 2009Applicant: FUJITSU LIMITEDInventors: Kensuke Kuraki, Jun Takahashi, Shohei Nakagata, Taizo Anan
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Publication number: 20090214033Abstract: Area data indicating an encryption area of image data and level data indicating an authority level for the encryption area are received. Upon being triggered by an input password, an encryption key is generated for each received authority level. Check data to be detected in verifying whether or not the encrypted image data in the encryption area is appropriately decrypted through decryption is implanted in the encryption area. Image encryption is performed on the encryption area where the check data is implanted, by using the encryption key corresponding to the authority level designated for the encryption area. In decryption, all decryption keys corresponding to all authority levels lower than or equal to the set authority level are used to decrypt each encryption area and determines whether or not an appropriate decryption has been performed on the basis of the result of the detection of the check data.Type: ApplicationFiled: December 18, 2008Publication date: August 27, 2009Applicant: FUJITSU LIMITEDInventors: Shohei Nakagata, Taizo Anan, Kensuke Kuraki, Jun Takahashi
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Publication number: 20090174910Abstract: A plurality of background texture patterns each of which includes a region not having a dot and having a feature different from those of the other background texture patterns, are combined, and information is embedded in a background region of a document image. Then, a mathematical-morphology-based conversion is performed on the document image, and thereby a feature of a region not having a dot in each of the background texture patterns is extracted in order to identify the embedded information.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Applicant: FUJITSU LIMITEDInventors: Kensuke KURAKI, Shohei Nakagata, Hideaki Ishii, Motoo Masui, Taizo Anan
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Publication number: 20080298596Abstract: When decrypting an image of a part of a document that is encrypted and therefore illegible, a user uses a decryption apparatus 15 to read the document as an electronic image and also to receive a user authentication by accessing a key management server 11. Then, the user transmits a management number obtained from the image to the key management server 11 from the decryption apparatus 15. The key management server 11 extracts position information of the portion of the document that is encrypted and a decryption key for decrypting this portion from a key management database 13 and transmits the decryption key to the decryption apparatus 15. The decryption apparatus 15 processes the electronic image by using the position information and decryption key received from the key management server 11 so as to decrypt the encrypted part so that it is legible.Type: ApplicationFiled: May 30, 2007Publication date: December 4, 2008Applicant: FUJITSU LIMITEDInventors: Kensuke Kuraki, Hiroji Fukui, Taizo Anan, Shohei Nakagata
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Publication number: 20080170808Abstract: According to a program, a computer determine an interpolation method for interpolating respective pixel values of plural pixels not existing in an input image and positioned on a straight line.Type: ApplicationFiled: December 26, 2007Publication date: July 17, 2008Applicant: FUJITSU LIMITEDInventors: Shohei Nakagata, Kohji Yamada
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Publication number: 20080080009Abstract: An embedding area in which a background pattern can be embedded from the color document image is extracted. At least one of a color and a shape of a background pattern appropriate for the embedding area is determined depending on an area color of the embedding area. A background pattern image is generated by embedding watermark information in the embedding area using the determined background pattern.Type: ApplicationFiled: September 28, 2007Publication date: April 3, 2008Applicant: Fujitsu LimitedInventors: Motoo Masui, Kensuke Kuraki, Shohei Nakagata, Hideaki Ishii, Taizo Anan
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Publication number: 20080037898Abstract: An image processing apparatus includes a target-area setting unit that sets, in image data, an area around a target pixel as a target area, and an overshoot-undershoot suppressing unit that corrects a pixel value of the target pixel in the image data after processing based on pixel values of pixels in the target area.Type: ApplicationFiled: December 20, 2006Publication date: February 14, 2008Inventors: Shohei Nakagata, Kensuke Kuraki, Kohji Yamada