System and method for calibrating camera position in a computer vision-based self-service checkout terminal

A system for camera position calibration in a self-service terminal, comprising:

• a computing device having a processor and a non-transitory computer-readable storage medium;
• a plurality of cameras coupled to the computing device, each of the plurality of cameras having a predefined expected orientation with respect to an actual scan zone for of the self-service terminal such that a target zone representing the actual scan zone or an outline thereof appears in a predefined position within a field of view of the camera, each of the plurality of cameras providing a respective video output signal to the computing device;
• a user interface coupled to the computing device having a user interface and a display;
• and
• wherein the non-transitory computer-readable storage medium includes executable instructions that, when executed by the processor, cause the processor to:
• allow a user to select one of the plurality of cameras for calibration using the user interface;
• combine the video output signal from the selected camera with an overlay image file, the overlay image file having a nontransparent section and a transparent section corresponding to the predefined position of the target zone within the field of view of the selected camera;
• and
• provide the video output signal from the selected camera combined with the overlay image file to the display to show an actual orientation of the selected camera with respect to the target zone overlaid with the overlay image file to allow a user to adjust a position of the selected camera so that the actual orientation of the selected camera with respect to the target zone matches the predefined expected orientation;
• and
• wherein the overlay image file comprises a non-transparent mask region covering substantially the entire field of view of the selected camera except for a transparent window, the transparent window corresponding to the predefined position of the target zone within the field of view of the camera.

A method for camera position calibration in a self-service terminal, the self-service terminal including a camera coupled having a predefined expected orientation with respect to an actual scan zone of the self-service terminal such that a target zone representing the actual scan zone or an outline thereof appears in a predefined position within a field of view of the camera, comprising:

• combining a video output signal from the camera with an overlay image file, the overlay image file having a nontransparent section and a transparent section corresponding to the predefined position of the target zone within the field of view of the camera;
• and
• providing the video output signal from the camera combined with the overlay image file to a display to show an actual orientation of the camera with respect to the target zone overlaid with the overlay image file to allow a user to adjust a position of the camera so that the actual orientation of the camera with respect to the target zone matches the predefined expected orientation;
• and
• wherein the overlay image file comprises a non-transparent mask region covering substantially the entire field of view of the camera except for a transparent window, the transparent window corresponding to the predefined position of the target zone within the field of view of the camera.