Focus stabilization of imaging system with variable focus lens
AssigneeZebra Technologies Corporation
InventorVladimir Gurevich
Life of this patent
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Abstract
A method and apparatus for the focus stabilization of an imaging system with variable focus lenses is disclosed herein. As example imaging system includes a variable focus (VF) lens for imaging an object of interest (OOI), a controller configured to provide a voltage to the VF lens, an imaging sensor, and a processor. The processor obtains a calibration parameter, and the imaging system obtains a plurality of images of the OOI. The processor identifies a region of interest of one or more of the images, and an alignment parameter is determined from the images. The processor then determines a tuning parameter from comparing the determined alignment parameter with the obtained calibration parameter. The controller tunes the VF lens according to the determined tuning parameter.
Claims24
A computer-implemented method for focus stabilization of an imaging system, the method comprising:
- obtaining, by a processor, a calibration parameter value;
- obtaining, by the imaging system, a first plurality of images of an object of interest, wherein each image of the first plurality of images is obtained by the imaging system at a different optical focus;
- identifying, by the processor, a region of interest in at least one image of the first plurality of images, wherein the region of interest contains an indicia indicative of the object of interest;
- analyzing, by the processor, each of the images of the first plurality of images at the region of interest;
- determining, by the processor, a set of image quality values from the analyzed images, wherein each of the image quality values of the set of image quality values corresponds to a respective analyzed image in the first plurality of images;
- determining, by the processor, a current alignment parameter value from at least one of the image quality values of the set of image quality values;
- determining, by the processor, a tuning parameter value by comparing the alignment parameter value with the calibration parameter value;
- and
- tuning, by the processor, the imaging system according to the tuning parameter.
A focus stabilization imaging system comprising:
- a variable focus lens configured to receive light from an object of interest for imaging the object of interest;
- a controller communicatively coupled to the variable focus lens and configured to provide a voltage to the variable focus lens;
- an imaging sensor configured to receive an image of the object and to generate an electrical signal indicative of the received image;
- a processor and computer-readable media storing machine readable instructions that, when executed, cause the focus stabilization imaging system to:
- obtain, by the processor, a calibration parameter value;
- obtain, by the imaging system, a first plurality of images of the object of interest, wherein each image of the first plurality of images is obtained by the imaging system at a different optical focus;
- identify, by the processor, a region of interest in at least one image of the first plurality of images, wherein the region of interest contains an indicia indicative of the object of interest;
- analyze, by the processor, each of the images of the first plurality of images at the region of interest;
- determine, by the processor, a set of image quality values from the analyzed images, wherein each of the image quality values of the set of image quality values corresponds to a respective analyzed image in the first plurality of images;
- determine, by the processor, a current alignment parameter value from at least one of the image quality values of the set of image quality values;
- determine, by the processor, a tuning parameter value by comparing the current alignment parameter value with the calibration parameter value;
- and
- tune, by the controller, the optical focus of the imaging system according to the tuning parameter.
Dependencies are inferred from the claim text.