Topic
Orientation (computer vision)
About: Orientation (computer vision) is a research topic. Over the lifetime, 17196 publications have been published within this topic receiving 358181 citations.
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18 Aug 1997
TL;DR: A fast algorithm is presented for skew and slant correction in printed document images by searching for a peak in the histogram of the gradient orientation of the input grey-level image.
Abstract: A fast algorithm is presented for skew and slant correction in printed document images. The algorithm employs only the gradient information. The skew angle is obtained by searching for a peak in the histogram of the gradient orientation of the input grey-level image. The skewness of the document is corrected by a rotation at such an angle. The slant of characters can also be detected using the same technique, and can be corrected by a shear operation. A second method for character slant correction by fitting parallelograms to the connected components is also described. Document images with different contents (tables, figures, and photos) have been tested for skew correction and the algorithm gives accurate results on all the test images, and the algorithm is very easy to implement.
89 citations
Patent•
09 Aug 2011
TL;DR: In this paper, a system and method for improving a surgeon's vision by overlaying augmented reality information onto a video image of the surgical site is presented, where the surgeon performs the surgery, the AR controller augments the real-time video image with the processed pre-operative image and displays the augmented image on an interface to provide further guidance to the surgeon during the surgical procedure.
Abstract: A system and method for improving a surgeon's vision by overlaying augmented reality information onto a video image of the surgical site. A high definition video camera sends a video image in real time. Prior to the surgery, a pre-operative image is created from MRI, x-ray, ultrasound, or other method of diagnosis using imaging technology. The pre-operative image is stored within the computer. The computer processes the pre-operative image to decipher organs, anatomical geometries, vessels, tissue planes, orientation, and other structures. As the surgeon performs the surgery, the AR controller augments the real time video image with the processed pre-operative image and displays the augmented image on an interface to provide further guidance to the surgeon during the surgical procedure.
89 citations
Patent•
19 Nov 1997
TL;DR: An interactive photo kiosk as discussed by the authors allows the user to pose and freeze a selected image made visible to the user on a display screen, and the selected frozen image is processed electronically to form a single digital multiple image of the same image in a selected area format, which, when delivered to a printing apparatus for hard copy print-out, produces a multiple image on a single sheet wherein each of the multiple images can be peeled off the single sheet and used separately from each other.
Abstract: An interactive photo kiosk in which, in one embodiment thereof, presents an upright open face which enables a user to stand directly in front of the kiosk, which optically defocuses the background image and substitutes a selected computer generated image, and which enables the user to pose and freeze a selected image made visible to the user on a display screen. Users may choose from among a menu of different computer generated background images. In a preferred embodiment, the selected frozen image is in digital form and is processed electronically to form a single digital multiple image of the same image in a selected area format which, when delivered to a printing apparatus for hard copy print-out, produces a multiple image of the same frozen image on a single sheet wherein each of the multiple images can be peeled off the single sheet and used separately from each other. An interactive image adjusting feature is provided to allow a user to modify the size and orientation of the user's image within the composite image. The composite image is formed by providing a uniform colored backdrop behind the user, imaging the user with the backdrop, and electronically replacing the backdrop color with the selected background image.
89 citations
Patent•
22 Oct 2003
TL;DR: In this paper, a method for determining the 3D location and orientation of a subject surface in a distinguished perspective image of the subject surface is described. But the method is limited to a subset of visual features.
Abstract: A facility for determining the 3-dimensional location and orientation of a subject surface in a distinguished perspective image of the subject surface is described. The subject surface has innate visual features, a subset of which are selected (216). The facility uses the location of the selected visual features in a perspective image of the subject surface that precedes the distinguished perspective image in time to identify search zones in the distinguished perspective image. The facility searches the identified search zones for the selected visual features to determine the 2-dimensional locations at which the selected visual features occur. Based on the determined 2-dimensional locations, the facility determines the 3-dimensional location and orientation of the subject surface in the distinguished perspective image(210, 230, 220).
89 citations
Patent•
14 Feb 2008TL;DR: In this paper, a handheld device determines its orientation relative to a device user and selects a format based on that orientation, and the displayed information may also be scrolled or zoomed based on a detected motion of the device.
Abstract: A handheld device presents information on a display screen in alternate formats. The device determines its orientation relative to a device user and selects a format based on that orientation. The displayed information may also be scrolled or zoomed based on a detected motion of the device.
89 citations