Multispectral Polarization Image Database (MSPI DB)
Image Capture Information
| Camera | Point Grey Grasshopper3 |
| Camera Resolution | 1920 x 1440 pixel |
| Database Image Resolution | 1800 x 1300 pixel |
| Lens | Nikon AI Nikkor 50mm f/1.4S |
| Filter | CRi VariSpec |
| Illuminant | SERIC SOLAX 100Wseries artificial solar illuminators |
| Motorized rotor | Thorlabs K-Cube Brushed DC Servo Motor Controller |
| Range of wavelength | 420 nm to 720 nm (10 nm intervals) |
| Number of bands | 31 bands |
| Focus | Fixed (focused at 550 nm) |
A monochrome camera (Point Grey Grasshopper3), a lens (Nikon AI Nikkor 50mm f/1.4S), and a liquid crystal tunable filter (CRi VariSpec) were used for the imaging system. The liquid crystal tunable filter contains a linear polarizer, which was rotated at 0°, 45°, 90°, and 135° using a motorized rotor (Thorlabs K-Cube™ Brushed DC Servo Motor Controller). Two light sources (SERIC SOLAX 100W series artificial solar illuminators) were used for illumination. 20 scenes were captured with a resolution of 1920 x 1440 pixel and a bit depth of 12 bits. The spectral information is 31 wavelengths at 10 nm intervals from 420 nm to 720 nm, and the polarization information is 4 polarization angles: 0°, 45°, 90°, and 135°. The resolution of the database image (1800 x 1300 pixel) is smaller than that of the camera (1920 x 1440 pixel), but this is due to cropping after correcting for inter-polarization shifts caused by rotation. Pixel values in the image database are converted to values that imply spectral reflectance. A pixel value of 4095 corresponds to a reflectance of 1. The pixel values of the standard white plate are used to calculate the spectral reflectance. All plants, flowers, and food in the images are imitations. The RGB image is calculated from the reflectance using D65 standard illuminance, XYZ tristimulus function, sRGB color transformation, and gamma correction. If you use any image data from this website in an academic publication, please provide an appropriate citation using the reference information at the bottom of this website.
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Reference
Kazuma Shinoda and Tomoharu Ishiuchi, "Multispectral polarization image demosaicing using redundant Stokes representation," Appl. Opt. 64(5), 1152-1166 (2025).
