Dot peen mark image acquisition
First Claim
Patent Images
1. A method, comprising:
- measuring a distance from a lens to a mark;
calculating a focus position for an autofocus system that focuses the lens on the mark;
determining whether the mark is a dot peen mark or not; and
if the mark is a dot peen mark;
applying an offset to the calculated focus position to produce an offset focus position;
setting the autofocus system to the offset focus position;
acquiring an image of the mark with the autofocus system set to the offset focus position; and
decoding the mark with a decoder using the acquired image of the mark.
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Abstract
A mark reader apparatus has a lens and an autofocus system that manipulates the lens in accordance with control signals. An image acquisition system measures a distance from the lens to a dot peened mark. A processor is programmed to: calculate a focus position for the autofocus system that focuses the lens on the dot peened mark; apply an offset to the calculated focus position to produce an offset focus position; control the autofocus system by positioning the autofocus system to the offset focus position; and via the image acquisition system, acquire an image of the mark with the autofocus system set to the offset focus position.
600 Citations
17 Claims
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1. A method, comprising:
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measuring a distance from a lens to a mark; calculating a focus position for an autofocus system that focuses the lens on the mark; determining whether the mark is a dot peen mark or not; and if the mark is a dot peen mark; applying an offset to the calculated focus position to produce an offset focus position; setting the autofocus system to the offset focus position; acquiring an image of the mark with the autofocus system set to the offset focus position; and decoding the mark with a decoder using the acquired image of the mark. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mark reader apparatus, comprising:
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a lens; an autofocus system that manipulates the lens in accordance with control signals; an image acquisition system that measures a distance from the lens to a mark; and a processor that is programmed to; calculate a focus position for an autofocus system that focuses the lens on the mark; and function in a dot peen decode mode and a non-dot peen decode mode; wherein in the dot peen decode mode, the processor is programmed to; apply an offset to the calculated focus position to produce an offset focus position; position the autofocus system to the offset focus position; and acquire an image of the mark with the autofocus system set to the offset focus position; wherein in the non-dot peen decode mode, the processor is programmed to; apply an offset setting of zero to the calculated focus position to produce an offset focus position; acquire an image of the mark with the autofocus system set to the offset setting of zero; and decode the mark at a decoder by using the acquired image of the mark. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification