Driver monitoring system and associated image-capture method

A driver monitoring system comprising circuitry that executes an image capture method comprising:

• capturing, with an image sensor having a pixel array, a first image of a scene by generating a first plurality of pixel signals that includes (i) a target pixel-signal group T1 generated by a target pixel-group having pixel-coordinates of a target region of the pixel array, (ii) a pixel-signal group P11 generated by a first remaining pixel-group having pixel-coordinates of a first remaining pixel-array region of the pixel array, and (iii) a pixel-signal group P21 generated by second remaining pixel-group having pixel-coordinates of a second remaining pixel-array region of the pixel array;
• transferring the first plurality of pixel signals to a storage region of the image sensor;
• reading the target pixel-signal group T1 and the pixel-signal group Pu from the storage region;
• capturing a second image of the scene by generating a second plurality of pixel signals that includes a target pixel-signal group T2 corresponding to the target pixel-group;
• transferring the second plurality of pixel signals to the storage region;
• and
• reading the target pixel-signal group T2 and the pixel-signal group P21 from the storage region.