Rotating plate carrier for changing focal distance of optical code imager
First Claim
Patent Images
1. An imager based optical code reading and weighing system comprising:
- an image sensor having a field of view;
a weighing platform in the field of view of the image sensor which platform moves in response to the weight of an object placed on the platform; and
an electronic processor receiving image information from the image sensor for detecting and decoding optical code in the field of view of the image sensor;
for measuring the amount of movement of the platform in response to the weight of the object placed on the platform from image data from the image sensor; and
for producing a signal related in value to the weight of the object.
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Abstract
An imaging optical code reader is adapted for use in producing video displays and for use in motion detection surveillance using video compression and narrow band width communication links. An optical system including a plane parallel plate may be employed to change the system focal distance. The imaging optical code reader is also adapted for measurement of physical parameters of a target object including motion, distance, weight and dimensions.
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Citations
35 Claims
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1. An imager based optical code reading and weighing system comprising:
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an image sensor having a field of view;
a weighing platform in the field of view of the image sensor which platform moves in response to the weight of an object placed on the platform; and
an electronic processor receiving image information from the image sensor for detecting and decoding optical code in the field of view of the image sensor;
for measuring the amount of movement of the platform in response to the weight of the object placed on the platform from image data from the image sensor; and
for producing a signal related in value to the weight of the object. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for obtaining and displaying video image signals comprising:
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a handheld optical code reader including a two dimensional image sensor and means for compressing video data obtained from the sensor;
a host terminal with a communication port and display; and
a narrow band width data link over which compressed video data from the handheld optical code reader is communicated to a communication port of the host terminal. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method for performing motion detection using an optical code reader comprising the steps of:
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positioning an image sensor of the optical code reader so that a field of view of the image sensor includes a region to be monitored for motion;
switching the optical code reader from an optical code reading mode to a motion detection mode;
compressing video data in the field of view of the image sensor by identifying changes between frames of video data; and
monitoring the frequency of changes between frames of video data to identify frequency changes indicative of the movement of objects of interest in the field of view. - View Dependent Claims (15)
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16. An apparatus for detecting optical code and one or more physical parameters of a target object comprising:
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an image sensor for producing electronic signals corresponding to a two dimensional array of pixel information for a field of view containing the target object;
means for projecting a pattern on a target in the field of view of the sensor; and
means for reading an optical code in the field of view of the image sensor and for determining a physical parameter of the target object from the reflection of the pattern from the target object onto the image sensor. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An optical system for a handheld optical code reader including an image sensor, comprising:
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an objective lens located in an optical path of the code reader for focusing an image of an optical code onto the image sensor;
a carrier rotatable about an axis and having a sector radially outwardly located from the rotation axis through which optical code are read, the carrier having a second sector located radially outwardly of the axis, said second sector containing an optical element, which when placed in the optical path changes the focal distance of the optical system to a focal distance more appropriate for producing video images with the handheld optical code reader; and
means for rotating the carrier for selectively positioning a selected one of first and said second sectors in the optical path. - View Dependent Claims (23, 24, 25, 26, 27)
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28. An optical system for an optical code reader comprising:
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an area image sensor;
an objective lens assembly adapted and positioned for focusing an image onto the area image sensor; and
a transparent optical element with substantially parallel, planar surfaces, selectively movable into the optical path of the image sensor;
wherein the system has a focal distance adapted for reading code symbols relatively near to the objective lens assembly and another focal distance for imaging scenes relatively far from the objective lens assembly; and
wherein the thickness of the plate is selected to change the focal distance of the system between the one focal distance and the other. - View Dependent Claims (29, 30)
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31. A method for measuring orthogonal dimensions of a rectangular solid object in a field of view of a handheld imager, comprising the steps of:
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obtaining pixel information for the field of view of the imager;
determining a distance between the object and the imager;
determining the angles between edges of the rectangular solid meeting at a nearest corner of the object and determining an imaged length of edges of the rectangular solid to be measured from the pixel information; and
scaling the determined image length of the edges responsive to the determined angles and determined distance between the rectangular solid and the imager to obtain an approximation of the actual length of said edges. - View Dependent Claims (32, 33, 34)
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35. A handheld imaging device for reading optical code and providing video image signals to a remote terminal, comprising:
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an image sensor having a field of view;
an aiming pattern projector for aiming the image sensor at an optical code;
a manually-actuated trigger switch for initiation of reading an optical code in the field of view of the image sensor;
output circuitry for selectively outputting signals from the image sensor corresponding to at least three image frames per second of a changing two dimensional image in the field of view of the image sensor; and
output circuitry for selectively outputting data decoded from an optical code in the field of view of the image sensor.
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Specification