6533b7dafe1ef96bd126eb05
RESEARCH PRODUCT
Wavelength-compensated time-sequential multiplexed color joint transform correlator
P. García-martínezJosé Luis MartínezMaría Del Mar Sánchez-lópezIgnacio Morenosubject
DiffractionChannel (digital image)Computer scienceMaterials Science (miscellaneous)ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONColorPhysics::OpticsMultiplexingIndustrial and Manufacturing EngineeringSpectral linePattern Recognition Automatedlaw.inventionOpticslawImage Processing Computer-AssistedComputer SimulationBusiness and International ManagementComputingMethodologies_COMPUTERGRAPHICSSpatial light modulatorbusiness.industryLasersSpectrum AnalysisLaserObject detectionLiquid CrystalsLiquid crystal on siliconRGB color modelbusinessPhase modulationdescription
We report a wavelength-compensated three-channel (RGB) joint transform correlator (JTC) for color pattern recognition using a ferroelectric liquid-crystal spatial light modulator (SLM) operating in binary pure phase modulation. We apply a previously reported time-multiplexing technique useful in creating wavelength-compensated diffraction patterns, based on the synchronization of properly scaled diffraction masks with the input wavelength selection obtained by applying a rotating RGB color-filter wheel to an Ar-Kr laser. The application of this technique to a JTC architecture permits real-time color object detection. In order to achieve a high light efficiency for the correlation process, we combine the design of zero-order joint power spectra in all color channels with the selection of a certain polarization configuration of the SLM, producing a broadband phase-only modulation. Excellent experimental results demonstrating color-object detection are provided.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-09-02 | Applied Optics |