This letter presents the recent developments of large-area focal plane “pseudo” arrays for infrared (IR) imaging. The devices are based on the epitaxial integration of an n-type mid-IR (8–10 μm) GaAs/AlGaAs quantum-well detector with a light-emitting diode. The increase of spontaneous emission by the midinfrared-induced photocurrent is detected with a charge-coupled device camera in the reflection configuration. The mid-IR image of a blackbody object is up-converted to a near-IR transformed image with very small distortion.

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Three-dimensional object classification from 2-D IR images is shown. The wavelet transform is used for edge detection. Edge tracking is used for removing noise effectively in the wavelet transform. The invariant Fourier descriptor is used to describe the contour curves. Invariance under out-of-plane rotation is achieved by the feature space trajectory neural network working as a classifier.