  We present a first-of-its-kind ultra-compact intelligent camera system,
dubbed i-FlatCam, including a lensless camera with a computational (Comp.)
chip. It highlights (1) a predict-then-focus eye tracking pipeline for boosted
efficiency without compromising the accuracy, (2) a unified compression scheme
for single-chip processing and improved frame rate per second (FPS), and (3)
dedicated intra-channel reuse design for depth-wise convolutional layers
(DW-CONV) to increase utilization. i-FlatCam demonstrates the first eye
tracking pipeline with a lensless camera and achieves 3.16 degrees of accuracy,
253 FPS, 91.49 $\mu$J/Frame, and 6.7mm x 8.9mm x 1.2mm camera form factor,
paving the way for next-generation Augmented Reality (AR) and Virtual Reality
(VR) devices.
