Fig. 3: Image recognition.
From: Space-efficient optical computing with an integrated chip diffractive neural network
a Schematics of the image recognition process. The input test image dimension is n × n, target image dimension is m × m and the output dimension is k =n + m - 1. b Experimental normalized intensity from the output waveguides when the sample sequence [10101] is the same as the target sequence [10101]. c Experimental correlation results for digit image recognition. There are three-digit images (1, 2, 9), and each digit image is composed of 5 × 5 matrix.
