Depth sensor based auto-focus system for an indicia scanner
First Claim
1. A method for reading indicia, comprising the steps of:
- providing an indicia reading terminal having;
a three dimensional depth sensor,a two dimensional image sensor, andan autofocusing lens assembly positioned proximate to the two dimensional image sensor such that the incident light passes through the autofocusing lens before reaching the two dimensional image sensor;
capturing a first depth image of a field of view with the three dimensional depth sensor;
determining distances from the indicia reading terminal to major surfaces in the depth image having areas greater than a predetermined threshold to create a depth map of the first depth image, comprising calculating areas of the major surfaces and comparing the calculated areas to the predetermine threshold;
calculating optimal focal distances from the autofocusing lens assembly to each of the major surfaces;
capturing a first image with the two dimensional image sensor when the autofocusing lens assembly is focused at one of the optimal focal distances; and
decoding an indicia in the captured first image.
1 Assignment
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Accused Products
Abstract
An indicia reading terminal has a three-dimensional depth sensor, a two dimensional image sensor, an autofocus lens assembly, and a processor. The three dimensional depth sensor captures a depth image of a field of view and create a depth map from the depth image, the depth map having one or more surface distances. The two dimensional image sensor receives incident light and capture an image therefrom. The autofocusing lens assembly is positioned proximate to the two dimensional image sensor such that the incident light passes through the autofocusing lens before reaching the two dimensional image sensor. The processor is communicatively coupled to the two dimensional image sensor, the three dimensional depth sensor, and the autofocusing lens assembly.
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Citations
10 Claims
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1. A method for reading indicia, comprising the steps of:
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providing an indicia reading terminal having; a three dimensional depth sensor, a two dimensional image sensor, and an autofocusing lens assembly positioned proximate to the two dimensional image sensor such that the incident light passes through the autofocusing lens before reaching the two dimensional image sensor; capturing a first depth image of a field of view with the three dimensional depth sensor; determining distances from the indicia reading terminal to major surfaces in the depth image having areas greater than a predetermined threshold to create a depth map of the first depth image, comprising calculating areas of the major surfaces and comparing the calculated areas to the predetermine threshold; calculating optimal focal distances from the autofocusing lens assembly to each of the major surfaces; capturing a first image with the two dimensional image sensor when the autofocusing lens assembly is focused at one of the optimal focal distances; and decoding an indicia in the captured first image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reading indicia, comprising the steps of:
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providing an indicia reading terminal having; a three dimensional depth sensor, a two dimensional image sensor, and an autofocusing lens assembly positioned proximate to the two dimensional image sensor such that the incident light passes through the autofocusing lens before reaching the two dimensional image sensor; capturing a first depth image of a field of view with the three dimensional depth sensor; determining distances from the indicia reading terminal to major surfaces in the depth image having areas greater than a predetermined threshold to create a depth map of the first depth image; calculating optimal focal distances from the autofocusing lens assembly to each of the major surfaces; capturing a first image with the two dimensional image sensor when the autofocusing lens assembly is focused at one of the optimal focal distances; decoding an indicia in the captured first image; and comparing the area of the major surface having the decodable indicia with an expected area value encoded in the decodable indicia.
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Specification