Source: http://www.google.com/patents/US7434733?dq=%22Meaning-based+advertising+and+document+relevance+determination%22
Timestamp: 2016-07-28 03:56:38
Document Index: 763061117

Matched Legal Cases: ['Application No. 02', 'Application No. 02723063', 'Application No. 06', 'Application No. 02', 'Application No. 06', 'Application No. 2002']

Patent US7434733 - Optical reader having partial frame operating mode - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method for decoding a decodable symbol using an optical reader having a 2D image sensor that is configured to operate in a partial frame capture operating mode. In a partial frame operating mode, the reader clocks out and captures at least one partial frame of image data having image data corresponding...http://www.google.com/patents/US7434733?utm_source=gb-gplus-sharePatent US7434733 - Optical reader having partial frame operating modeAdvanced Patent SearchPublication numberUS7434733 B2Publication typeGrantApplication numberUS 11/637,231Publication dateOct 14, 2008Filing dateDec 11, 2006Priority dateJan 22, 2001Fee statusPaidAlso published asUS7270273, US20040195332, US20070181693Publication number11637231, 637231, US 7434733 B2, US 7434733B2, US-B2-7434733, US7434733 B2, US7434733B2InventorsCharles P. Barber, Carl W. Gerst, III, S. Smith II George, Robert M. Hussey, Robert C. Gardiner, Matthew W. PankowOriginal AssigneeHand Held Products, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (100), Non-Patent Citations (26), Referenced by (8), Classifications (12), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetOptical reader having partial frame operating mode
US 7434733 B2Abstract
1. An apparatus for decoding information from a decodable symbol, the apparatus comprising:
wherein said apparatus is configured to operate in a first operating mode in which said apparatus operates said 2D image sensor to capture a partial frame of image data representing at least a portion of said decodable symbol and corresponding to a first set of pixels of said 2D image sensor, wherein said apparatus when operating in said first operating mode avoids obtaining electrical signals representing light intensity at each pixel of said image sensor;
wherein said apparatus is configured to process said partial frame of image data corresponding to said first set of pixels to attempt to decode therefrom information encoded by said decodable symbol; and
wherein said apparatus is further configured to operate in a second operating mode in which said apparatus operates said 2D image sensor to capture a frame of image data representing at least a portion of said decodable symbol and corresponding to a second set of pixels of said 2D image sensor, said second set of pixels being different from said first set; and
wherein said apparatus is configured to switch out of said first operating mode and into said second operating mode on the condition that said apparatus fails to decode information encoded by said decodable symbol when operating in said first operating mode.
2. The apparatus of claim 1, wherein said apparatus when operating in said first operating mode in which said apparatus operates said 2D image sensor to capture a partial frame of image data avoids obtaining electrical signals representing light intensity at each pixel of said image sensor by not clocking out an electrical signal for each pixel of said image sensor.
3. The apparatus of claim 1, wherein said apparatus when operating in said first operating mode in which said apparatus operates said 2D image sensor to capture a partial frame of image data avoids obtaining electrical signals representing light intensity at each pixel of said image sensor by clocking out certain pixels of said image sensor at a rate that is too fast to allow development of electrical signals representative of light intensity at the certain pixels.
4. The apparatus of claim 1, wherein said second set of pixels comprises each pixel of said 2D image sensor.
5. The apparatus of claim 1, wherein said second set of pixels comprises less than each pixel of said 2D image sensor.
6. The apparatus of claim 1, wherein said first set of pixels includes a row of pixels at or about a center of said image sensor, and wherein said apparatus includes an illumination system projecting a horizontal line light pattern.
7. The apparatus of claim 1, wherein said first set of pixels includes a row of pixels at or about a center of said image sensor, and wherein said apparatus includes an illumination system including LEDs projecting a horizontal line light pattern.
8. The apparatus of claim 1, wherein said first set of pixels is a linear pattern of pixels.
9. The apparatus of claim 1, wherein said first set of pixels is a plurality of angularly offset linear patterns of pixels.
10. The apparatus of claim 1, wherein said first set of pixels is a plurality of vertically spaced apart horizontally oriented linear patterns of pixels.
11. The apparatus of claim 1, wherein said first set of pixels is a grouping of pixels about a center of said image sensor.
12. The apparatus of claim 1, wherein said first set of pixels includes a row of pixels at or about a center of said image sensor.
This application is a continuation of U.S. patent application Ser. No. 10/651,298 filed Aug. 28, 2003 now U.S. Pat. No. 7,270,273, which is a continuation-in-part of U.S. patent application Ser. No. 09/766,806, filed Jan. 22, 2001, (now U.S. Pat. No. 6,637,658). Each of the above applications is incorporated herein by reference in its entirety.
[Beginning of section excerpted from U.S. patent application Ser. No. 09/766,922]
[End of section excerpted from U.S. patent application Ser. No. 09/766,922]
FIGS. 6 a-6 g illustrate various image data patterns that may be captured by an optical reader operating in a partial frame capture mode according to the invention;
FIGS. 7 b-7 h show various types of optical reader housings in which the invention may be incorporated;
[Beginning of section excerpted from U.S. patent application Ser. No. 09/766,806]
Border 210 defines the full field of view of an optical reader in the case the reader is operated in a full frame captured mode while symbols 216-1, 216-2, 216-3, 2164, 216-6 and 216-7 are symbols entirely within the full field of view of an optical reader defined by border 10 but are only partially within certain valid zones shown. Valid zones 212-1, 212-3, 212-7, 212-8, 212-9, 212-10, and 212-13 are valid zones of image data that partially contain representations of a decodable symbol while valid zones 212-11 and 212-12 are valid zones of image data captured during a partial frame capture mode which contain representations of an entire decodable symbol.
[End of section excerpted from U.S. patent application Ser. No. 09/766,806]
Referring to FIGS. 6 a-6 g, there is shown an optical reader equipped with a 2D image sensor that is configured to operate in a partial frame capture mode. In a partial frame clock out mode, a control circuit of an optical reader clocks out (or “reads”) electrical signals corresponding to less than all of the 2D image sensor's pixels, and captures image data corresponding to the pixel locations into memory. It should be understood that while the 2D image sensor can view, or image, the entire area from which illumination is provided to its pixels, in the partial frame mode contemplated, only a subset of such pixels are actually interrogated or caused to provide electrical signals that are then used for analysis. The partial frame mode is controlled by a control module, as will be explained in greater detail below. The partial frame of image data is processed using a processing module configured to extract information encoded by the encoded indicium, as will be explained in greater detail below.
Partial frames of image data which may be clocked out and captured by an optical reader control circuit (or control module) during a partial frame capture mode are illustrated in FIGS. 6 a-6 g in which valid zones 1012 represent frame image data corresponding to image sensor pixel positions that are clocked out and invalid zones 1014 represent potential image data positions corresponding to pixel positions that are not clocked out.
In the examples illustrated with reference to FIGS. 6 a-6 d an optical reader operating in a partial frame clock out mode clocks out electrical signals corresponding to linear patterns of pixels. It is useful to cause a reader to clock out electrical signals corresponding to linear patterns as shown in FIGS. 6 a-6 d when a reader will be used to decode mainly 1D linear bar code symbols.
An optical reading system in which the invention may be employed is described with reference to the block diagram of FIG. 7 a. Optical reader 1110 includes an illumination assembly 1120 for illuminating a target object T, such as a 1D or 2D bar code symbol, and an imaging assembly 1130 for receiving an image of object T and generating an electrical output signal indicative of the data optically encoded therein. Illumination assembly 1120 may, for example, include an illumination source assembly 1122, together with an illuminating optics assembly 1124, such as one or more lenses, diffusers, wedges, reflectors or a combination of such elements, for directing light from light source 1122 in the direction of a target object T. Illumination assembly 1120 may comprise, for example, laser or light emitting diodes (LEDs) such as white LEDs or red LEDs. Illumination assembly 1120 may include target illumination and optics for projecting an aiming pattern 1127 on target T. Illumination assembly 1120 may be eliminated if ambient light levels are certain to be high enough to allow high quality images of object T to be taken. Imaging assembly 1130 may include an image sensor 1132, such as a 1D or 2D CCD, CMOS, NMOS, PMOS, CID OR CMD solid state image sensor, together with an imaging optics assembly 1134 for receiving and focusing an image of object T onto image sensor 1132. The array-based imaging assembly shown in FIG. 7 a may be replaced by a laser array based imaging assembly comprising multiple laser sources, a scanning mechanism, emit and receive optics, at least one photodetector and accompanying signal processing circuitry.
FIGS. 7 b-7 g show examples of types of housings in which the 2D imager of the present invention may be incorporated. FIGS. 7 b-7 g show 1D/2D optical readers 1110-1, 1110-2 and 1110-3. Housing 1112 of each of the optical readers 1110-1 through 1110-3 is adapted to be graspable by a human hand and has incorporated therein at least one trigger switch 1174 for activating image capture and decoding and/or image capture and character recognition operations. Readers 1110-1 and 1110-2 include hard-wired communication links 1179 for communication with external devices such as other data collection devices or a host processor, while reader 1110-3 includes an antenna 1180 for providing wireless communication to an external device or a host processor.
Any one of the readers described with reference to FIGS. 7 b-7 g may be mounted in a stationary position as is illustrated in FIG. 7 h showing a generic optical reader 1110 docked in a scan stand 1190. Scan stand 1190 adapts portable optical reader 1110 for presentation mode scanning. In a presentation mode, reader 1110 is held in a stationary position and an indicium-bearing article is moved across the field of view of reader 1110. By comparison, in a hand-held mode, the reader 1110 is manually positioned so that the 2D imager can view an encoded indicium within a target area of the reader.
In the example of FIG. 6 b, control circuit 1140 executes a partial frame capture mode in order to capture data defining valid zones 1012-2, 1012-3 and 1012-4 of a full frame of image data corresponding to a full field of view of a 2D image sensor. Valid zones 1012-2, 1012-3 and 1012-4 are line patterns of image data at various angular orientations. Reading of pixels of linear valid zones arranged at various angular orientations is effective to decode a 1D symbol which may be located at an oblique angle in a field of view. It is seen that reading of pixels of linear valid zone 1012-3 will result in the successful decoding of 1D bar code symbol 1016-2. Zones 1012-2, 1012-3 and 1012-4 may be one or more pixels wide.
In the example of FIG. 6 c, control circuit 1140 executes a partial frame capture mode in order to clock out and capture image data defining valid zones 1012-5 through 1012-9. Valid zones 1012-5 to 1012-9 form a plurality of horizontal parallel lines. The pattern of valid zones shown in FIG. 6 c clocked out and captured in a partial frame capture mode is effective for decoding substantially horizontally oriented 1D symbols which are at an unknown height in a full field of view. It is seen that the reading of image data of valid zone 1012-8 will not result in the decoding of symbol 1016-3 because symbol 1016-3 is not a 1D symbol. Nevertheless, because valid zone 1012-8 intersects symbol bullseye 1016 b, reading of an image data of valid zone 1012-8 may be effective to determine that a 2D symbol is likely present in the full field of view of image sensor 1132. In one aspect of the invention, reader 1110 may be configured to switch out of a partial frame capture mode and into a full frame capture mode when reading of image data captured in the partial frame capture mode reveals that a 2D symbol is likely to be represented in the image data corresponding to the image sensor's full field of view.
In the example of FIGS. 6 f and 6 g valid zones 1012-12 and 1012-13 correspond to nonlinear groupings of pixels. Capturing of the valid zone patterns 1012-12 and 1012-13 of FIGS. 6 f and 6 g is particularly useful for decoding symbol image data in the case that a symbol is likely to be at a certain position in relation to an image sensor's full frame field of view such as in the center of an image sensor's field of view as shown in FIG. 6 f. In the example of FIG. 6 f control circuit 1140 can successfully decode symbol 1016-6 because symbol 1016-6 is located entirely within valid zone 1012-12.
Those of ordinary skill will recognize that many functions of electrical and electronic apparatus can be implemented in hardware (for example, hard-wired logic), in software (for example, logic encoded in a program operating on a general purpose processor), and in firmware (for example, logic encoded in a non-volatile memory that is invoked for operation on a processor as required). The present invention contemplates the substitution of one implementation of hardware, firmware and software for another implementation of the equivalent-functionality using a different one of hardware, firmware and software. To the extent that an implementation can be represented mathematically by a transfer function, that is, a specified response is generated at an output terminal for a specific excitation applied to an input terminal of a “black box” exhibiting the transfer function, any implementation of the transfer function, including any combination of hardware, firmware and software implementations of portions or segments of the transfer function, is contemplated herein.
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