Abstract: A hand-held bar code reader includes a laser scanning module and a two dimensional image sensor and processing for reading a bar code. The laser scanner assists the 2D image processing by providing information on location, type, range, reflectivity, and presence of bar code for 2D reading. Additionally, the 2D imaging reading operation is improved by using the laser scan as a spotter beam for aiming.
Abstract: An apparatus for viewing a retroreflective object positions a light source proximate a human eye, by affixing it to, for example, a pair of goggles. The light source emits light outward in substantially the direction of view of the human eye. Upon striking a retroreflective object, the light is strongly reflected back to the human eye, producing a unique visual effect. The apparatus may be used in toy form to simulate a night vision scope. Various combinations of colored light sources, optical color filters interposed between the human eye and the retroreflector, and colored retroreflectors may be used to enhance the visual effect and increase the play variations available. The light source may switch on and/or off automatically, or may flash. Electronic light sensing means may provide a visible and/or audible alert when a retroreflective object is in view.
Abstract: A method for determining degrees of freedom of an object, and in particular, to a device for determining up to six degrees of freedom of a head mount display and a handle. A first camera is attached to a head mount display and senses an optically modulated target. The first camera's video output signal is processed with a digital computer to determine the position and orientation of the head mount display. A second camera is attached to a head mount display and senses an optically modulated target attached to a handle. The second camera's video output signal is processed with a digital computer to determine the position and orientation of the handle.
September 19, 1996
Date of Patent:
January 5, 1999
Eric P. Batterman, Donald G. Chandler, Robert H. Dunphy
Abstract: A method for determining up to six degrees of freedom of a camera relative to a reference frame comprises sensing an optically modulated target with the camera and processing the camera's video output signal with a digital computer. The target may have a single pattern, multiple patterns, or patterns of varying size. Multiple targets may also be used. A very wide field of view camera may be used in conjunction with a method for removing geometric distortion from the camera's view. Target patterns may be transmissive, reflective, or retroreflective, or may actively emit light. Asymmetric patterns are used to eliminate ambiguity in the recovery of the degrees of freedom.
July 31, 1996
Date of Patent:
November 3, 1998
Eric P. Batterman, Donald G. Chandler, Robert H. Dunphy
Abstract: A bar code reader includes a first and second memory arrangement in which a two dimensional image containing the image of a bar code symbol at a random location and orientation is stored in a first memory. Thereafter, the contents of the first memory is processed by a specialized controller to determine whether any portion of the stored image is likely to contain a bar code symbol, and if so, at what location. If a bar code symbol is located, then the portion of the image stored in the first memory which has been identified as likely to contain a bar code symbol is transferred to a second memory. In the second memory, the stored image is processed by a digital signal processor in order to orient, filter and scan the stored bar code image.
Abstract: A hand-held bar code reader with a two dimensional image sensor for omnidirectional bar code reading, includes variable imaging optics, and flash illumination with variable flash illumination optics. A spotter beam is provided for aiming the hand held bar code reader at a bar code symbol. The spotter beam is also used to measure the range to said bar code from said hand held bar code reader and to determine the focal length of said variable imaging optics and variable flash illumination optics. The imaging optics are adjusted automatically to provide the correct magnification and focus of a bar code regardless of range to the label. The variable focal length flash illumination optics are used to concentrate illumination energy only in the field of view of the bar code reader. The flash illumination energy is conserved by measuring the ambient light and setting the level of flash illumination energy in accordance with the measured level of ambient light.
Abstract: A bar code reader includes an image capture means for storing a two dimensional image in memory, which stored image may include a bar code symbol within the field of view of said image. The present bar code reader further includes method and apparatus for determining the location and orientation of said bar code symbol within the field of view of said image, and then filtering said located and oriented bar code symbol along an axis perpendicular to said detected orientation. Thereafter, the filtered bar code symbol is scanned and applied to a decoder to produce a decoded bar code output.
Abstract: A bar code reader utilizing a two dimensional image capture optical system, includes a method and apparatus for distinguishing a preferred bar code out a plurality of bar codes within the field of view of the bar code reader. The method and apparatus for distinguishing a preferred bar code includes placing a special pattern proximate to the bar code to be distinguished. In one embodiment, a predetermined pattern at a predetermined location and orientation relative to the bar code is placed on a label. The reader includes means for detecting the presence of the predetermined pattern after the bar code has been located. The bar code reader first locates each of the plurality of bar codes, and then checks each located bar code to determine whether the predetermined pattern is present. If the predetermined pattern is detected, then the corresponding located bar code is scanned and decoded as the preferred bar code.
Abstract: An optically encoded information bearing label containing a two dimensional array of data cells includes a finder pattern comprising a plurality of spots arranged in a predetermined geometric pattern substantially analogous to the predetermined geometric pattern of said two dimensional array of data cells. The finder pattern is detected by first scanning the image area to detect spots. The locations of detected spots are compared to the known geometry of the finder pattern in order to provide for rapid and reliable finding of the finder pattern and the information bearing label. Additionally, the detected finder pattern spots provide information for decoding the two dimensional data array in order to compensate for label magnification, tilt and other distortions.
Abstract: A multiple resolution optically encoded label is readable at two more optical resolutions, and is able to store two or more respective channels of optically encoded information. Low resolution information is encoded in a plurality of large cells arranged in a predetermined geometric pattern. Each of the large cells includes a plurality of smaller cells for storing high resolution information. Method and apparatus are disclosed for encoding both high resolution data, and low resolution data, as well as for finding and reading both high resolution and low resolution data.
Abstract: An omnidirectional bar code reader uses a virtual scan of raster scan digital image memory to create the equivalent scanning pattern of a mechanical laser scanner. A two dimensional image of bar code symbol at any random orientation is captured in a memory. In one embodiment, the image memory is scanned to create a virtual scan equivalent to the scan pattern of a laser scanner. In another embodiment, the image memory is divided into plurality of memory segments, and simultaneous virtual scan is provided in each of the respective memory segments. In yet another embodiment, the memory is divided into a plurality of overlapping memory segments and simultaneous virtual scan is provided in each of the respective overlapping memory segments. The overlap between the memory segments is made large enough so that a bar code symbol of the expected size will be entirely included in one or the other of the overlapping memory segments.