Abstract:
A method is described for automatically predicting user-preferred copy or scan settings based on past user behavior. The method is implemented in a management section of a copier, scanner, or multifunction devices that combine copy, scan and print functions, or on a server connected with such a device. The management section maintains a copy/scan/user (CSU) settings database that stores copy and/or scan settings associated with user IDs. Each time a copy or scan job is initiated, the management section analyzes the CSU database to determine a predicted user-preferred setting. The user may manually change the setting and confirm it, and the management section stores the user confirmed setting in the CSU database for future use. The CSU database may be transferred from one copier/scanner/multifunction device to another.
Abstract:
An apparatus and method for deskewing a scanned printed document is described. The original printed document is scanned with the scanner to obtain a first digital image, which contains skew (rotation) with respect to the original printed document. The first digital image is digitally flipped around a centerline to obtain a second digital image, which is printed to generate a second printed document. The second printed document is scanned using the same scanner to obtain a third digital image, which contains skew errors with respect to the second printed document. The third digital image is digitally flipped around the centerline to obtain a final digital image, which is substantially free of the skew introduced by the scanner.
Abstract:
A document authentication method compares a target document image (scanned image) with an original document image at multiple levels, such as block (e.g. paragraph, graphics, image), line, word and character levels. The paragraph level comparison determines whether the target and original images have the same number of paragraphs and whether the paragraphs have the same sizes and locations; the line level comparison determines if the target and original images have the same number of lines and whether the lines have the same sizes and locations; etc. Document segmentation is performed on the target and original images to segment them into paragraph units, line units, etc. for purposes of the comparisons. The original document may be segmented beforehand and the segmentation information stored for later use. The authentication process may be designed to stop when alterations are detected at a higher level, so lower level comparisons are not carried out.
Abstract:
A document authenticating method is disclosed by which a plurality of two-dimensional barcode stamps are generated and printed on a back side of the document forming a color mosaic pattern. Each barcode stamp by itself is a binary barcode, but the plurality of barcode stamps as a whole are printed with different colors and/or color intensities. The barcode stamps collectively encode the content of the document to be used for document authentication.
Abstract:
An improved document authentication method in which critical content, such as signatures, is preserved at a high-resolution in the authentication data carried on the self-authenticating document. When generating authentication data, signatures are compressed without down-sampling to preserve their resolution and quality. The compressed signature data (a bit string) is embedded in an image segment on the document. For example, each bit of the bit string is stored in the low bits of one or more image pixels. A hash code is calculated from the bit string and stored in a barcode printed on the document. To authenticate a scanned-back document, the bit string is recovered from the image segment. A hash code is calculated from the recovered bit string and compared to the hash code extracted from the barcode. The signatures re-generated from the recovered bit string are compared to the signatures in the scanned document.
Abstract:
A document authenticating method is disclosed by which numerous small-sized two-dimensional barcode stamps are generated and placed in a distributed manner on a printed document. The small-sized barcode stamps collectively encode the content of the document to be used for document authentication. In one example, the stamp size is about ¼ by ¼ inches or less and the tile size for the stamps is 4 by 4 pixels at a resolution of 400 dpi. The document is segmented into segments each containing a paragraph or a line of text. For each segment, a set of barcode stamps encoding the authentication data for the segment is placed in the vicinity of the segment. They may be placed in the empty space in the last line of each paragraph, in the empty space between adjacent paragraphs, or at the beginning or end of each line.
Abstract translation:公开了一种文件认证方法,其中生成大量的小尺寸二维条形码邮票并以分布的方式放置在打印文档上。 小尺寸条形码邮票集中编码要用于文件认证的文档的内容。 在一个示例中,邮票大小约为1/4英寸或更小,邮票的尺寸为400 dpi的分辨率为4 x 4像素。 文档被分割成段,每个段包含一段或一行文本。 对于每个段,将编码该段的认证数据的一组条形码标记放置在段的附近。 它们可以放置在每段最后一行的空白处,相邻段落之间的空白空间,或每行开头或末尾。
Abstract:
The present application relates to an image processing apparatus and a method for matching and combining two map images with at least some overlap area. In some embodiments, color features of a first map image data and a second map image data are extracted and areas of matching color are determined. Border features in areas of matching color in the image data for the first and second maps may be extracted and map areas common to the first map image data and the second map image data may be determined based on the areas of matching color and the border features. Feature points of map areas common to the first and second maps may be extracted and the first map image data and the second map image data may be combined using common feature points.
Abstract:
A color barcode can record much more amount of information than black white barcode. However, the problem of the color barcode is that it is easy to lose integrity or authenticity in printing and copy generation. This invention provides an apparatus and a method to keep the integrity or authenticity of the color barcode. Such is accomplished by the color reference portion of the color barcode including reference color tiles filled with colors which are used in a data portion of the color barcode and an apparatus and a method for producing, reproducing and reading such color barcode.
Abstract:
A method for compensating for color variations introduced by printer hardware limitations and other factors is described. First, for each printer model or each individual printer, the extent of color variation throughout a printed page is determined. Based on this determination, each page is partitioned into a plurality of image areas. Then, in an actual printing process, the page of image is printed in a multi-pass process where each image area is printed in a separate pass. The digital image data is shifted and/or rotated for each pass, and the paper is shifted and/or rotated correspondingly, so that the different image areas printed in different passes form a complete image on the final printed page. From the standpoint of the pointer hardware, all passes involve printing the same area of a physical page, resulting in reduced color variation across the page.
Abstract:
An image encryption method is described for encrypting an images using an encryption key. The encryption method includes dividing the image into pixel groups and shifting the location of the pixel groups according to an encryption key, and reordering the bits of the pixel values of the image according to an encryption key. Each shifting and reordering is done according to a shifting patterns that is defined by a shifting rule and the bit values of a bit sequence generated from the encryption key. The encrypted image is embedded in a cover image using less significant bits of the cover image for transmission or storage. Corresponding decryption method is also provided. Also described are various applications of image encryption methods in secure handling of digital images, including secure scanning, secure printing, secure ID scanning, secure check reading, remote picture ID verification, and remote document submitting and receiving systems.