Indicia sensor system for optical reader
First Claim
1. A method for operating an optical reading device, the optical reading device including an imaging assembly and a control system, the method including the steps of:
- capturing a frame of imaging data using the imaging assembly;
applying at least one adaptive threshold to the imaging data to obtain edge transition data;
analyzing the edge transition data to detect the presence of machine readable indicia; and
changing a mode of operation of the device from a first mode of operation to at least one second mode of operation, if the step of analyzing indicates that the imaging data represents machine readable indicia.
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Abstract
In the present invention, the control unit of an optical reader analyzes image data being generated by the imaging element of the reader and changes the mode of operation of the reader if the image data indicates that machine readable indicia, such as a bar code symbol or a text character, is likely in the field of view of the reader. Normally, analysis of image data includes the step of detecting for edge transitions in the image information. If the control unit determines that the image data includes more than a predetermined number of edge transitions, then the control unit imparts appropriate control over various reader elements to change the mode of operation of the reader. Normally, the control unit changes the mode of operation of the reader from a first mode, wherein the reader does not operate to decode or recognize image data to a second mode, wherein the reader operates to decode and/or recognize image data.
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Citations
43 Claims
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1. A method for operating an optical reading device, the optical reading device including an imaging assembly and a control system, the method including the steps of:
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capturing a frame of imaging data using the imaging assembly;
applying at least one adaptive threshold to the imaging data to obtain edge transition data;
analyzing the edge transition data to detect the presence of machine readable indicia; and
changing a mode of operation of the device from a first mode of operation to at least one second mode of operation, if the step of analyzing indicates that the imaging data represents machine readable indicia. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An optical imaging device for reading machine readable indicia disposed on an object, the device comprising:
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an imaging assembly configured to capture a frame of imaging data corresponding to an image of the object; and
a control system coupled to the imaging assembly, the processor being configured to, apply at least one adaptive threshold to the imaging data to thereby detect edge transitions in the imaging data, analyze the edge transitions to determine whether the imaging data includes machine readable indicia, and decode the machine readable indicia if the step of analyzing indicates the presence of machine readable indicia. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification