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Outdoor Radiance Calibration and Image Target Adjustment Process

This process helps determine the highest radiance orientation of image targets in sunlight and shadows, adjust exposure, fix settings, and calibrate solar radiance. It involves spatial adjustments, spectral filtering, polar filters, and BRDF determination. Further enhancements include down-sampling images for accuracy and generating spatial-resolution-based statistics. Additional positions and spectral bands can be included as needed for improved measurement results. No background pBRDF model is required for this outdoor measurement process.

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Outdoor Radiance Calibration and Image Target Adjustment Process

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  1. Visual Inspection of Target; Determine highest radiance orientation Image target and cal target in full sun, adjust exposure to ensure no saturation Fix Exposure / Gain Settings Adjust camera spatial and irradiance response, g(i,j) A’ = A•g(i,j), B’ = B•g(i,j), etc. Image Cal Target in Full Sun (A) Image Cal Target in Shadow (B) Addt’l spectral bands? Spatial registration of A-D images (each pol and spectral band) Change Spectral Filter YES Radiance Calibration NO Downsample A-D images--further improve registration accuracy Set Pol Filter Orientation Image Target in Full Sun (C) Image Target in Shadow (D) Calibrate solar radiance, A’ - B’ Reposition Camera Determine BRDF (L0) π -1•(C’ - D’)/(A’ - B’) and Stokes radiance Addt’l spectral bands? Change Spectral Filter YES YES Generate spatial-resolution dependent pBRVF statistics (DOP and χ distribution) Additional positions? YES Addt’l Pol Orient? NO NO Target Measurement Incorporate data into a background pBRDF model NO PROCESSING OUTDOOR MEASUREMENTS

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