Machine vision system and method with multi-aperture optics assembly
AssigneeCognex Corporation
InventorsJose Fernandez-Dorado, Laurens Nunnink
Life of this patent
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Abstract
An apparatus for controlling a depth of field for a reader in a vision system includes a dual aperture assembly having an inner region and an outer region. A first light source can be used to generate a light beam associated with the inner region and a second light source can be used to generate a light beam associated with the outer region. The depth of field of the reader can be controlled by selecting one of the first light source and second light source to illuminate an object to acquire an image of the object. The selection of the first light source or the second light source can be based on at least one parameter of the vision system.
Claims20
A machine vision system comprising:
- an optics assembly with a fixed multi-aperture assembly and at least one lens;
- a sensor assembly including an image sensor and a processor device;
- and
- an illumination assembly;
- the illumination assembly being configured to selectively illuminate an object for image acquisition using a first type of light or a second type of light;
- the fixed multi-aperture assembly having a first region and a second region, the first region being configured to pass the first and second types of light and the second region being configured to filter the first type of light and pass the second type of light, so that illumination with the second type of light provides a larger light aperture than illumination with the first type of light;
- and
- the processor device being configured to:
- select at least one of the first or second types of light, based on analyzing at least one of a first image acquired by the sensor assembly or a first image acquisition process for the first image;
- control the machine vision system to acquire a second image using the selected at least one of the first or second types of light;
- and
- analyze the second image to decode a symbol in the second image.
An apparatus for controlling a depth of field for a reader in a vision system, the apparatus comprising:
- an optics assembly comprising:
- a dual aperture assembly having an inner region and an outer region;
- and
- at least one lens;
- an image sensor;
- a first light source configured to generate a first light beam that is associated with the inner region of the dual aperture assembly;
- a second light source configured to generate a second light beam that is associated with the outer region of the dual aperture assembly;
- and
- a processor device in communication with the optics assembly, the first light source, and the second light source, the processor device configured to control the depth of field of the reader by selecting one of the first light source or the second light source to illuminate an object to acquire an image of the object, the selection being based on at least one parameter of the vision system.
A method for controlling a depth of field for a reader in a vision system, the method comprising:
- acquiring a first image of an object using a first light beam of a first type of light and a first region of a multi-aperture assembly that is associated with the first type of light;
- determining at least one parameter associated with the first image;
- based on the at least one parameter, acquiring a second image of the object using a second light beam of a second type of light and a second region of the multi-aperture assembly that is associated with the second type of light, the second image having a different depth of field than the first image.
Dependencies are inferred from the claim text.