danaroth/cave

Description

This database contains a set multispectral images that were used to emulate the GAP camera. The images are of a wide variety of real-world materials and objects.

Image capture information

Camera	Cooled CCD camera (Apogee Alta U260)
Resolution	512 x 512 pixel
Filter	VariSpec liquid crystal tunable filter
Illuminant	CIE Standard Illuminant D65
Range of wevelength	400nm - 700nm
Steps	10nm
Number of band	31 band
Focal length	f/1.4
Focus	Fixed (focused using 550nm image)
Image format	PNG (16bit)

NOTE: These multispectral images represent the reflectances of the materials in the scene. The reflectance spectrum at each pixel was computed from the measured multispectrum image using calibrated estimates of the illumination spectrum and camera spectral response. As a result, each multispectral image should be taken as a close approximation, rather than exact measurement, of the true reflectance of the scene.

Database organization

The database consists of 32 scenes, divided into 5 sections. Each scene has an associated zip file. These zip files include full spectral resolution reflectance data from 400nm to 700nm at 10nm steps (31 bands total). Each band is stored as a 16-bit grayscale PNG image. Image filenames are of the format 'object_ms_01.png', where the '01' at the end signifies that this is the first image (captured at 400nm). Thus, '02' corresponds to 410nm, and so on, until '31' for 700nm.

Each scene also contains a single representative color image, displayed using sRGB values rendered under a neutral daylight illuminant (D65).

Quick look

CAVE dataset teaser image.

Access instructions

The database of 32 scenes is divided into 5 sections, as shown below:

• Stuff

  

• Skin and hair

  

• Paints

  

• Food and drinks

  

• Real and fake

  

Related project

Generalized assorted pixel camera

Credits

The dataset was originally provided by Columbia University and available at:

https://www.cs.columbia.edu/CAVE/databases/multispectral/

Publication

Details of the database can be found in the following publication:

"Generalized Assorted Pixel Camera: Post-Capture Control of Resolution, Dynamic Range and Spectrum,"
F. Yasuma, T. Mitsunaga, D. Iso, and S.K. Nayar,
Technical Report, Department of Computer Science, Columbia University CUCS-061-08, Nov. 2008.

PDF - bib - (C) - Project Page