Optical information reading device
First Claim
1. An optical information reading device comprising:
- an imaging part including an imaging element which takes an image of a code attached to a workpiece which moves;
an input part inputting a moving speed of the workpiece;
a cell size setting part setting a size of a cell which constitutes the code on the image obtained by the imaging part;
an imaging condition setting part having a first function and a second function,the first function calculates an upper limit of an exposure time of the imaging part as a restriction condition for reading the code attached to the workpiece based on the moving speed inputted by the input part and the size of a cell set by the cell size setting part, andthe second function sets the exposure time of the imaging part within the upper limit calculated as the restriction condition by the first function, by analyzing a plurality of images, each of which includes a code and is obtained by taking images multiple times by changing the exposure time or the gain of the imaging part; and
a decoding part decoding a code included in an image, which is newly obtained by the imaging part using the exposure time which is set by the second function of the imaging condition setting part.
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Accused Products
Abstract
[Object] To enhance accuracy at the time of setting with consideration of a cell size of a code when an exposure time is automatically set. [Means to solve the problems] An upper limit of an exposure time of an imaging part as a restriction condition for reading a code attached to a workpiece is calculated based on a moving speed of the workpiece, which is inputted by an input part, and a cell size, which is calculated by a cell size calculation part. An exposure time of the imaging part is set within the restriction condition by analyzing a plurality of images, which includes a code and is obtained by taking images multiple times by changing the exposure time of the imaging part.
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Citations
7 Claims
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1. An optical information reading device comprising:
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an imaging part including an imaging element which takes an image of a code attached to a workpiece which moves; an input part inputting a moving speed of the workpiece; a cell size setting part setting a size of a cell which constitutes the code on the image obtained by the imaging part; an imaging condition setting part having a first function and a second function, the first function calculates an upper limit of an exposure time of the imaging part as a restriction condition for reading the code attached to the workpiece based on the moving speed inputted by the input part and the size of a cell set by the cell size setting part, and the second function sets the exposure time of the imaging part within the upper limit calculated as the restriction condition by the first function, by analyzing a plurality of images, each of which includes a code and is obtained by taking images multiple times by changing the exposure time or the gain of the imaging part; and a decoding part decoding a code included in an image, which is newly obtained by the imaging part using the exposure time which is set by the second function of the imaging condition setting part. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification