Fig. 3: Light tuneable NPM and PPM effects and synaptic characteristics. | Nature Communications

Fig. 3: Light tuneable NPM and PPM effects and synaptic characteristics.

From: Full hardware implementation of neuromorphic visual system based on multimodal optoelectronic resistive memory arrays for versatile image processing

Fig. 3: Light tuneable NPM and PPM effects and synaptic characteristics.

a Optically induced potentiation and depression processes under the continuous 80 mW, 200 ms light pulses and 40 mW, 200 ms light pulses, respectively. b, c PPM and NPM STP triggered by pair pulses with light intensities ranging from 10 to 60 mW and 70 to 100 mW, respectively. d The PPM effect with LTP features under the increased pulse number and the varied light intensities ranging from 70 to 100 mW. e The NPM effect with LTP features under the increased pulse number and the varied light intensities ranging from 10 to 60 mW. All photoconductance states were read out by 0.1 V. f Demonstration of the image contrast enhancement and denoising through the simultaneous NMP and PPM effects, and image erasing through NPM effects. g A “fish” image was sensed, denoised and enhanced in situ a 12 × 12 MSFP-based multimodal memory crossbar array. The memorised and pre-processing image in the array can be further erased by light illumination.

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