摘要:
An electronic document processing system 900 includes a digital image generating unit 15 generating a digital image in a predetermined range of the electronic document; an image encrypting unit 11 generating an encrypted image by converting at least a partial area of the generated digital image; a data encrypting unit 21 generating encrypted data by extracting data contained in the predetermined range in pieces of data organizing the electronic document and encrypting the data; an encrypted data storing unit 22 storing the encrypted data; and an encrypted electronic document generating unit 23 generating an encrypted electronic document by replacing the data contained in the predetermined range in the electronic document with the encrypted image.
摘要:
An electronic document processing system 900 includes a digital image generating unit 15 generating a digital image in a predetermined range of the electronic document; an image encrypting unit 11 generating an encrypted image by converting at least a partial area of the generated digital image; a data encrypting unit 21 generating encrypted data by extracting data contained in the predetermined range in pieces of data organizing the electronic document and encrypting the data; an encrypted data storing unit 22 storing the encrypted data; and an encrypted electronic document generating unit 23 generating an encrypted electronic document by replacing the data contained in the predetermined range in the electronic document with the encrypted image.
摘要:
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.
摘要:
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.
摘要:
A figure pattern expressing information to be embedded, or a position of an area in which the information to be embedded exists, is embedded in an area other than the background of image data, thereby generating image data embedded with a watermark. Then, the figure pattern is detected from the generated image data embedded with the watermark, and embedded information expressed by the detected figure pattern or embedded information existing in an area at a position expressed by the detected figure pattern is detected.
摘要:
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.
摘要:
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.
摘要:
A figure pattern expressing information to be embedded, or a position of an area in which the information to be embedded exists, is embedded in an area other than the background of image data, thereby generating image data embedded with a watermark. Then, the figure pattern is detected from the generated image data embedded with the watermark, and embedded information expressed by the detected figure pattern or embedded information existing in an area at a position expressed by the detected figure pattern is detected.
摘要:
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.
摘要:
An apparatus includes: a generator which generates a first pattern including a plurality of pixels having a first value, with an area of the first pattern changing in a constant cycle, and, a phase of cyclical change of the area changing based on a value of a symbol included in an inputted digital watermark information; a generator which generates a second pattern including a plurality of pixels having a second value, with an area of the second pattern changing with a frequency characteristic that is different from the cycle of change of the area; and a unit which superimposes the first and the second pattern into each image area of images in time series constituting an inputted video image to correct a value of each pixel in an image area to which the first or the second pattern is superimposed according to the first and the second value.