Hewlett-packard Development Company, L.P.

Ricoh Company, Ltd.

Serene Banerjee

Anjaneyulu Seetha Rama Kuchibhotla

Michael J Gormish

Pulkit Parikh

Noushath Shaffi

Prasenjit Dey

Sitaram Ramachandrula

Abhishek Chakraborty

Avinash Sharma

Yogesh Sankarasubramaniam

Nagabhushana Ayyanahal Matad

Krusheel Munnangi

Presented is a skew detection apparatus. In one form, the apparatus estimates skew based on the locations of a set of foreground content pixels or a set of edge pixels that are nearest to the side of an image of a document. In another form, the apparatus includes a skew estimation unit adapted to estimate skew based on the orientation of foreground or background content in the interior of a document. In another form, the apparatus estimates skew using segments of an image of a document. Also presented is a document image processing apparatus including the skew detection apparatus.

Skew detection

Presented is a method of automatically performing an action, based on graphical input. The method comprises: receiving, for a user, an input image; comparing the input image with the contents of a user-customized database comprising a plurality of records, each record representing a predefined class of image, wherein the user has previously associated records in the database with respective specified actions; attempting to recognize the image, based on the similarity of the input image to one of the predefined classes of image represented in the user-customized database; and if the image is recognized, performing the action previously associated by the user with the class. Also presented is apparatus for recognizing an image and a method of constructing a user-customized database.

Automatic recognition of images

Proposed is the use of a document widget for representing a property of a document. The document widget comprises: a human-readable portion for interpretation by a user; and a machine-readable portion representing the document property. By comprising information about a property of a document, a document widget may be processed in accordance with an optical recognition process so as to identify the document widget and enable extraction of the document property.

Document processing

An edge detection method and apparatus is disclosed. The method comprises the steps of: calculating a pixel gradient value for each of a plurality of pixels of a digital image, the pixel gradient value representing the difference of a pixel value with respect to at least one neighboring pixel; for each of a plurality of binarization threshold values, determining a corresponding edge map representing the location of pixel gradient values exceeding the binarization threshold value with respect to a side of the digital image; for each edge map, computing a measure of linearity; determining an optimal binarization threshold value based on the computed measures of linearity; and selecting the edge map corresponding to the optimal binarization threshold value.

Edge detection

A method and apparatus for handling restricted access and server/client handoffs in a communication environment is described. In one embodiment, the method includes receiving a first request for a first set of image data corresponding to an image, and responding to the first request with the first set of image data. The method may also include receiving a second request for a second set of image data corresponding to the image and determining that the second set of image data includes restricted data. A prompt for authentication may then be sent. The method may also include receiving the second request along with authentication information, determining again that the second request is for restricted data, and checking the authentication information. If the authentication information is correct, the method may also include providing the second set of image data.

Communication of compressed digital images with restricted access and server/client hand-offs

Presented is a method of rotating an input image comprising a plurality of rows of input pixels by a predetermined arbitrary angle to generate a rotated output image comprising a plurality of rows of output pixels. The method comprises: receiving a first input segment comprising a first contiguous subset of the plurality of rows of input pixels; applying to the first input segment a transformation depending on the predetermined angle and storing the transformed result in a memory; receiving a second input segment comprising a second contiguous subset of the plurality of rows of input pixels, the second subset being adjacent to the first in the input image; applying the transformation to the second input segment and storing the transformed result in a memory; and generating a first output segment based on the transformed results of the first and second input segments, the output segment comprising a contiguous subset of the plurality of rows of output pixels.

Image rotation

A method and apparatus for transporting portions of a codestream over a communications mechanism is described. In one embodiment, the method comprises sending a request over a network and receiving tile-parts of a JPEG 2000 compliant codestream from the network as a return type as part of a response to the request.

Transport of reversible and unreversible embedded wavelets

A method and apparatus for performing partial image uploads. In one embodiment, the method comprises the server sending a portion of the compressed data of a codestream corresponding to an entire image to a client in response to a first request, the server receiving a second request from the client, the server determining the second request is an upload request, and the server combining compressed data of the third request with the codestream for the entire image.

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Bengaluru, India

Serene Banerjee