Systems and methods of biometric analysis with adaptive trigger

A biometric analysis system, comprising:

• one or more illumination sources configured to provide dim illumination to a scene including a subject and configured to provide flash illumination to the subject in the scene;
• a rolling shutter camera configured to capture one or more images;
• and
• an adaptive trigger module configured to (i) analyze the scene to detect eyes of the subject in the scene during dim illumination of the scene, (ii) identify the eyes of the subject as a region of interest, (iii) determine a position in a frame of the rolling shutter camera that coincides with the identified region of interest, and (iv) arrange a flash pulse delay between a start of image writing by the rolling shutter camera and a trigger of the one or more illumination sources such that a stripe of the flash illumination coincides with the identified region of interest.

A method of biometric analysis, comprising:

• illuminating a scene and an object in the scene with dim illumination from one or more illumination sources;
• analyzing the scene with an adaptive trigger module to detect the object in the scene during dim illumination;
• determining a position in a frame of a rolling shutter camera that coincides with the detected object in the scene;
• and
• arranging a delay between a start of image writing by the rolling shutter camera and a trigger of the one or more illumination sources such that a stripe of flash illumination provided by the one or more illumination sources coincides with the detected object in the scene.

A non-transitory computer-readable medium storing instructions for biometric analysis that are executable by a processing device, wherein execution of the instructions by the processing device causes the processing device to:

• illuminate a scene and an object in the scene with dim illumination from one or more illumination sources;
• analyze the scene with an adaptive trigger module to detect the object in scene during dim illumination;
• determine a position in a frame of a rolling shutter camera that coincides with the detected object in the scene;
• and
• arrange a delay between a start of image writing by the rolling shutter camera and a trigger of the one or more illumination sources such that a stripe of flash illumination provided by the one or more illumination sources coincides with the detected object in the scene.