Figure 5.

The free-space optoelectronic encoder based on ROMA for the color image. (a) Schematic diagram of photoelectric encoding for the color image (Mauritshuis, The Hague); the encoding process and performance are demonstrated by extracting the pixels with coordinates (54, 75) in the R, G and B space. (b) Schematic diagram of the optical power density, the photocurrent of a single device and the sum of the photocurrents of a single column corresponding to the R, G and B pixels with coordinates (54, 75). (c) The diagram of the current of each device and the sum of the currents of a single column after voltage pulse encoding. (d) The mapping diagram of the encoded output signals of the R, G, and B pixels with coordinates (54, 75) in the 2D space. (e) The schematic diagram of NMSE and SNR of the pixels in the R, G and B spaces of Girl with a Pearl Earring after passing through the photoelectric encoder. (f) The normalized error graph of pixels in the R, G and B space after encoding. (g) Comparison of original pixels and recovered pixels based on ROMA photoelectric encoder.