Barcode reader having calibration of scanner image brightness with multiple FOVs from a single sensor
A barcode reader having calibration of scanner image brightness with multiple FOVs from a single sensor is disclosed herein. An example barcode reader includes an imaging system having a first and second FOV. A first illumination system is configured to illuminate the first FOV. The first illumination system has a first tolerance range and a first characteristic. A second illumination system is configured to illuminate the second FOV. The second illumination system has a second tolerance range and a second characteristic. The first characteristic is established to achieve a minimum desired brightness at a beginning portion of the first tolerance range and a maximum desired brightness at an end portion of the first tolerance range. The second characteristic is established to achieve a minimum desired brightness at a beginning portion of the second tolerance range and a maximum desired brightness at an end portion of the second tolerance range.
1. A barcode reader for capturing an image of at least one object appearing in a field of view (FOV), the barcode reader comprising:
an imaging system having a first FOV and a second FOV;
a first illumination system configured to illuminate the first FOV, the first illumination system having a first tolerance range and a first characteristic;
a second illumination system configured to illuminate the second FOV, the second illumination system having a second tolerance range and a second characteristic;
wherein the first characteristic is established to achieve a minimum preset brightness at a beginning portion of the first tolerance range and a maximum preset brightness at an end portion of the first tolerance range; and
wherein the second characteristic is established to achieve a minimum preset brightness at a beginning portion of the second tolerance range and a maximum preset brightness at an end portion of the second tolerance range.
2. The barcode reader of claim 1 , wherein at least one of the first characteristic and the second characteristic is at least one of a quantity of LED lights, a current value, and illumination pulse width.
3. The barcode reader of claim 1 , wherein the first FOV and the second FOV are associated with a single image sensor.
4. The barcode reader of claim 1 , wherein the first characteristic is different than the second characteristic.
5. The barcode reader of claim 1 , wherein the minimum preset brightness is established to allow the barcode reader to capture an image of a barcode having approximately a 25% minimum reflection difference in a scan zone of the barcode reader.
6. The barcode reader of claim 1 , wherein the maximum preset brightness is established to prevent sensor saturation of more than approximately 25% at a window of the barcode reader.
7. The barcode reader of claim 1 , wherein the first characteristic and the second characteristic are preset during manufacture of the barcode reader.
8. The barcode reader of claim 1 , wherein the first characteristic and the second characteristic are adjustable after manufacture of the barcode reader.
9. The barcode reader of claim 1 , wherein the barcode reader further comprises a controller, the controller programmed to automatically adjust the first characteristic and the second characteristic based on an illumination intensity seen on a set target.
10. A method of preparing a barcode reader for capturing an image of at least one object appearing in a field of view (FOV), the barcode reader having an imaging system having a first illumination system configured to illuminate a first FOV and a second illumination system configured to illuminate a second FOV, the method comprising:
identifying a first tolerance range of the first illumination system;
identifying a second tolerance range of the second illumination system;
establishing a first characteristic of the first illumination system to achieve a minimum preset brightness at a beginning portion of the first tolerance range and a maximum preset brightness at an end portion of the first tolerance range; and
establishing a second characteristic of the second illumination system to achieve a minimum preset brightness at a beginning portion of the second tolerance range and a maximum preset brightness at an end portion of the second tolerance range.
11. The method of claim 10 , wherein at least one of establishing the first characteristic and establishing the second characteristic includes at least one of identifying a number of LED lights and installing the number of LED lights in the first illumination system, setting a current value for first illumination system, and setting an illumination pulse width for the first illumination system.
12. The method of claim 10 , wherein the first FOV and the second FOV are associated with a single image sensor.
13. The method of claim 10 , wherein the first characteristic is different than the second characteristic.
14. The method of claim 10 , wherein the minimum preset brightness is established to allow the barcode reader to capture an image of a barcode having approximately a 25% minimum reflection difference in a scan zone.
15. The method of claim 10 , wherein the maximum preset brightness is established to prevent sensor saturation of more than approximately 25% at a window of the barcode reader.
16. The method of claim 10 , wherein the first characteristic of the first illumination system and the second characteristic of the second illumination system are established during manufacture of the barcode reader.
17. The method of claim 10 , wherein both the first characteristic of the first illumination system and the second characteristic of the second illumination system are established after manufacture of the barcode reader.
18. The method of claim 10 , wherein the barcode reader further comprises a controller, and the method further includes programming the controller to automatically adjust the first characteristic and the second characteristic based on an illumination intensity seen on a set target.