Image-based check processing system and a method of operating an image-based check processing system to test focus of an imaging camera
View Patent ↗An image-based check processing system has a focus test pattern on a background surface which is disposed along one side of a document transport path. An imaging camera is disposed along an opposite side of the document transport path and faces the focus test pattern. The imaging camera captures an image of a financial document along the document transport path when the financial document is between the imaging camera and the focus test pattern, and captures an image of the focus test pattern when no financial document is between the imaging camera and the focus test pattern. An energizeable first light source of a first electromagnetic frequency is provided for, when energized, illuminating a financial document moving past the imaging camera to allow the imaging camera to capture an image of the illuminated financial document. An energizeable second light source of a second electromagnetic frequency is provided for, when energized, illuminating the focus test pattern to allow the imaging camera to capture an image of the illuminated focus test pattern. The first light source is controlled so that the first light source is energized when a financial document in the document transport path is between the imaging camera and the focus test pattern. The second light source is controlled so that the second light source is energized when a gap is between adjacent financial documents in the document transport path. The captured image of the focus test pattern is analyzed to determine if the focus of the imaging camera is acceptable.
1. An image-based check processing system for processing financial documents, the system comprising:
a document transport path along which financial documents can be transported from an upstream end to a downstream end;
a focus test pattern on a background surface which is disposed along one side of the document transport path;
an imaging camera disposed along an opposite side of the document transport path and facing the focus test pattern and for (i) capturing an image of a financial document along the document transport path when the financial document is between the imaging camera and the focus test pattern, and (ii) capturing an image of the focus test pattern when no financial document is between the imaging camera and the focus test pattern;
an energizeable first light source of a first electromagnetic frequency and for, when energized, illuminating a financial document moving past the imaging camera to allow the imaging camera to capture an image of the illuminated financial document;
an energizeable second light source of a second electromagnetic frequency which is different from the first electromagnetic frequency and for, when energized, illuminating the focus test pattern to allow the imaging camera to capture an image of the illuminated focus test pattern; and
a controller for (i) controlling the first light source to energize the first light source when a financial document in the document transport path is between the imaging camera and the focus test pattern so that the imaging camera can capture an image of the financial document while the financial document is illuminated with light of the first electromagnetic frequency from the first light source, and (ii) controlling the second light source to energize the second light source when a gap is between adjacent financial documents in the document transport path so that the imaging camera can capture an image of the focus test pattern while the focus test pattern is illuminated with light of the second electromagnetic frequency from the second light source.
2. An image-based check processing system according to claim 1 , wherein (i) light from the first light source of the first electromagnetic frequency comprises visible light, and (ii) light from the second light source of the second electromagnetic frequency comprises invisible light.
3. An image-based check processing system according to claim 2 , wherein the invisible light from the second light source of the second electromagnetic frequency comprises ultraviolet light.
4. An image-based check processing system according to claim 1 , wherein the focus test pattern is substantially invisible when illuminated with light from the first light source of the first electromagnetic frequency.
5. An image-based check processing system according to claim 1 , further comprising means for analyzing the captured image of the focus test pattern to determine if the focus of the imaging camera is acceptable.
6. A method of operating an image-based check processing system for processing financial documents, the method comprising:
capturing an image of a financial document along a document transport path when the financial document is between an imaging camera which is disposed on one side of the document transport path and a focus test pattern which is on a background surface disposed along an opposite side of the document transport path;
capturing an image of the focus test pattern when no financial document is between the imaging camera and the focus test pattern;
at a first time, energizing a first light source of a first electromagnetic frequency to illuminate a financial document moving past the imaging camera with light of the first electromagnetic frequency from the first light source;
at a second time which is after the first time, energizing a second light source of a second electromagnetic frequency which is different from the first electromagnetic frequency to illuminate the focus test pattern with light of the second electromagnetic frequency from the second light source;
controlling the first light source to energize the first light source when a financial document in the document transport path is between the imaging camera and the focus test pattern to allow the imaging camera to capture an image of the financial document while the financial document is illuminated with light of the first electromagnetic frequency from the first light source; and
controlling the second light source to energize the second light source when a gap is between adjacent financial documents in the document transport path to allow the imaging camera to capture an image of the focus test pattern while the focus test pattern is illuminated with light of the second electromagnetic frequency from the second light source.
7. A method according to claim 6 , further comprising:
analyzing the captured image of the focus test pattern to determine if the focus of the imaging camera is acceptable.
8. A method according to claim 6 , wherein (i) light from the first light source of the first electromagnetic frequency comprises visible light, and (ii) light from the second light source of the second electromagnetic frequency comprises invisible light.
9. A method according to claim 8 , wherein the invisible light from the second light source of the second electromagnetic frequency comprises ultraviolet light.
10. A method according to claim 6 , wherein the focus test pattern is substantially invisible when illuminated with light from the first light source of the first electromagnetic frequency.