Phos is a color image database of 15 scenes captured under different illumination conditions. More particularly, every scene of the database contains 15 different images: 9 images captured under various strengths of uniform illumination, and 6 images under different degrees of non-uniform illumination. The images contain objects of different shape, color and texture.

Uniform illumination is achieved by using multiple diffusive light sources, evenly distributed around the objects, as well as a Lambertian white background. The different strengths of uniform illumination are captured by adjusting the shutter speed and as a result the exposure of the camera varies between -4 and +4 stops from the original correctly exposed image. Thus, for every scene there are four underexposed and four overexposed images with uniform illumination along with the photo captured under the correct exposure.

Non-uniform illumination is accomplished by adding a strong directional light source to the diffusive lights located around the objects. By adjusting the strength of the diffusive lights, six different mixtures of uniform and non-uniform illumination were created, ranging from both directional and uniform illumination to directional illumination only.

All collections are in lossless compressed png format and in full 24bit color. The size of the entire image collection captured at the original resolution (12.1MP) is exceptionally large and we publish it for reference purposes only. Thus, we provide downsampled versions of the original ones down to even 0.2MP. Researchers can view each scene below and choose to either download each one separately or the entire database as one compressed file in different resolutions.

If you use this dataset please cite:
V. Vonikakis, D. Chrysostomou, R. Kouskouridas and A. Gasteratos,
A biologically inspired scale-space for illumination invariant feature selection
Measurement Science and Technology, vol. 24, no. 7, p. 074024 (13pp), 2013.
doi:10.1088/0957-0233/24/7/074024

V. Vonikakis, D. Chrysostomou, R. Kouskouridas and A. Gasteratos,
Improving the Robustness in Feature Detection by Local Contrast Enhancement,
in Proceedings of the IEEE International Conference on Imaging Systems and Techniques (IST '12),
pp. 158 - 163, Manchester, United Kingdom, 16-17 July 2012.
doi:10.1109/IST.2012.6295482

download Full resolution dataset
[12.1MP / 4256 x 2832 / total 2.08 GB]

download Downsampled [0.8MP / 1064 x 708 / 184 MB]

download Downsampled [6MP / 2979 x 1982/ 1.36 GB]

download Downsampled [0.5MP / 852 x 567 / 119 MB]

download Downsampled [3MP / 2128 x 1416 / 648.5 MB]

download Downsampled [0.2MP / 511 x 340 / 45 MB]

 

Scene 1



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc1_minus_4 Phos2_uni_sc1_minus_3 Phos2_uni_sc1_minus_2 Phos2_uni_sc1_minus_1

Correct Exposure
Phos2_uni_sc1_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc1_plus_1 Phos2_uni_sc1_plus_2 Phos2_uni_sc1_plus_3 Phos2_uni_sc1_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc1_1 Phos2_nonuni_sc1_2 Phos2_nonuni_sc1_3 Phos2_nonuni_sc1_4 Phos2_nonuni_sc1_5 Phos2_nonuni_sc1_6

download Download this batch [0.5MP / 852 x 567 / 8.9 MB]

Scene 2



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc2_minus_4 Phos2_uni_sc2_minus_3 Phos2_uni_sc2_minus_2 Phos2_uni_sc2_minus_1

Correct Exposure
Phos2_uni_sc2_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc2_plus_1 Phos2_uni_sc2_plus_2 Phos2_uni_sc2_plus_3 Phos2_uni_sc2_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc2_1 Phos2_nonuni_sc2_2 Phos2_nonuni_sc2_3 Phos2_nonuni_sc2_4 Phos2_nonuni_sc2_5 Phos2_nonuni_sc2_6

download Download this batch [0.5MP / 852 x 567 / 8 MB]

Scene 3



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc3_minus_4 Phos2_uni_sc3_minus_3 Phos2_uni_sc3_minus_2 Phos2_uni_sc3_minus_1

Correct Exposure
Phos2_uni_sc3_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc3_plus_1 Phos2_uni_sc3_plus_2 Phos2_uni_sc3_plus_3 Phos2_uni_sc3_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc3_1 Phos2_nonuni_sc3_2 Phos2_nonuni_sc3_3 Phos2_nonuni_sc3_4 Phos2_nonuni_sc3_5 Phos2_nonuni_sc3_6

download Download this batch [0.5MP / 852 x 567 / 7.8 MB]

Scene 4



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc4_minus_4 Phos2_uni_sc4_minus_3 Phos2_uni_sc4_minus_2 Phos2_uni_sc4_minus_1

Correct Exposure
Phos2_uni_sc4_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc4_plus_1 Phos2_uni_sc4_plus_2 Phos2_uni_sc4_plus_3 Phos2_uni_sc4_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc4_1 Phos2_nonuni_sc4_2 Phos2_nonuni_sc4_3 Phos2_nonuni_sc4_4 Phos2_nonuni_sc4_5 Phos2_nonuni_sc4_6

download Download this batch [0.5MP / 852 x 567 / 7.9 MB]

Scene 5



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc5_minus_4 Phos2_uni_sc5_minus_3 Phos2_uni_sc5_minus_2 Phos2_uni_sc5_minus_1

Correct Exposure
Phos2_uni_sc5_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc5_plus_1 Phos2_uni_sc5_plus_2 Phos2_uni_sc5_plus_3 Phos2_uni_sc5_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc5_1 Phos2_nonuni_sc5_2 Phos2_nonuni_sc5_3 Phos2_nonuni_sc5_4 Phos2_nonuni_sc5_5 Phos2_nonuni_sc5_6

download Download this batch [0.5MP / 852 x 567 / 7.5 MB]

Scene 6



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc6_minus_4 Phos2_uni_sc6_minus_3 Phos2_uni_sc6_minus_2 Phos2_uni_sc6_minus_1

Correct Exposure
Phos2_uni_sc6_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc6_plus_1 Phos2_uni_sc6_plus_2 Phos2_uni_sc6_plus_3 Phos2_uni_sc6_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc6_1 Phos2_nonuni_sc6_2 Phos2_nonuni_sc6_3 Phos2_nonuni_sc6_4 Phos2_nonuni_sc6_5 Phos2_nonuni_sc6_6

download Download this batch [0.5MP / 852 x 567 / 7.8 MB]

Scene 7



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc7_minus_4 Phos2_uni_sc7_minus_3 Phos2_uni_sc7_minus_2 Phos2_uni_sc7_minus_1

Correct Exposure
Phos2_uni_sc7_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc7_plus_1 Phos2_uni_sc7_plus_2 Phos2_uni_sc7_plus_3 Phos2_uni_sc7_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc7_1 Phos2_nonuni_sc7_2 Phos2_nonuni_sc7_3 Phos2_nonuni_sc7_4 Phos2_nonuni_sc7_5 Phos2_nonuni_sc7_6

download Download this batch [0.5MP / 852 x 567 / 7.6 MB]

Scene 8



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc8_minus_4 Phos2_uni_sc8_minus_3 Phos2_uni_sc8_minus_2 Phos2_uni_sc8_minus_1

Correct Exposure
Phos2_uni_sc8_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc8_plus_1 Phos2_uni_sc8_plus_2 Phos2_uni_sc8_plus_3 Phos2_uni_sc8_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc8_1 Phos2_nonuni_sc8_2 Phos2_nonuni_sc8_3 Phos2_nonuni_sc8_4 Phos2_nonuni_sc8_5 Phos2_nonuni_sc8_6

download Download this batch [0.5MP / 852 x 567 / 7.5 MB]

Scene 9



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc9_minus_4 Phos2_uni_sc9_minus_3 Phos2_uni_sc9_minus_2 Phos2_uni_sc9_minus_1

Correct Exposure
Phos2_uni_sc9_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc9_plus_1 Phos2_uni_sc9_plus_2 Phos2_uni_sc9_plus_3 Phos2_uni_sc9_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc9_1 Phos2_nonuni_sc9_2 Phos2_nonuni_sc9_3 Phos2_nonuni_sc9_4 Phos2_nonuni_sc9_5 Phos2_nonuni_sc9_6

download Download this batch [0.5MP / 852 x 567 / 7.1 MB]

Scene 10



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc10_minus_4 Phos2_uni_sc10_minus_3 Phos2_uni_sc10_minus_2 Phos2_uni_sc10_minus_1

Correct Exposure
Phos2_uni_sc10_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc10_plus_1 Phos2_uni_sc10_plus_2 Phos2_uni_sc10_plus_3 Phos2_uni_sc10_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc10_1 Phos2_nonuni_sc10_2 Phos2_nonuni_sc10_3 Phos2_nonuni_sc10_4 Phos2_nonuni_sc10_5 Phos2_nonuni_sc10_6

download Download this batch [0.5MP / 852 x 567 / 7.4 MB]

Scene 11



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc11_minus_4 Phos2_uni_sc11_minus_3 Phos2_uni_sc11_minus_2 Phos2_uni_sc11_minus_1

Correct Exposure
Phos2_uni_sc11_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc11_plus_1 Phos2_uni_sc11_plus_2 Phos2_uni_sc11_plus_3 Phos2_uni_sc11_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc11_1 Phos2_nonuni_sc11_2 Phos2_nonuni_sc11_3 Phos2_nonuni_sc11_4 Phos2_nonuni_sc11_5 Phos2_nonuni_sc11_6

download Download this batch [0.5MP / 852 x 567 / 8.3 MB]

Scene 12



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc12_minus_4 Phos2_uni_sc12_minus_3 Phos2_uni_sc12_minus_2 Phos2_uni_sc12_minus_1

Correct Exposure
Phos2_uni_sc12_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc12_plus_1 Phos2_uni_sc12_plus_2 Phos2_uni_sc12_plus_3 Phos2_uni_sc12_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc12_1 Phos2_nonuni_sc12_2 Phos2_nonuni_sc12_3 Phos2_nonuni_sc12_4 Phos2_nonuni_sc12_5 Phos2_nonuni_sc12_6

download Download this batch [0.5MP / 852 x 567 / 8.1 MB]

Scene 13



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc13_minus_4 Phos2_uni_sc13_minus_3 Phos2_uni_sc13_minus_2 Phos2_uni_sc13_minus_1

Correct Exposure
Phos2_uni_sc13_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc13_plus_1 Phos2_uni_sc13_plus_2 Phos2_uni_sc13_plus_3 Phos2_uni_sc13_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc13_1 Phos2_nonuni_sc13_2 Phos2_nonuni_sc13_3 Phos2_nonuni_sc13_4 Phos2_nonuni_sc13_5 Phos2_nonuni_sc13_6

download Download this batch [0.5MP / 852 x 567 / 7.5 MB]

Scene 14



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc14_minus_4 Phos2_uni_sc14_minus_3 Phos2_uni_sc14_minus_2 Phos2_uni_sc14_minus_1

Correct Exposure
Phos2_uni_sc14_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc14_plus_1 Phos2_uni_sc14_plus_2 Phos2_uni_sc14_plus_3 Phos2_uni_sc14_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc14_1 Phos2_nonuni_sc14_2 Phos2_nonuni_sc14_3 Phos2_nonuni_sc14_4 Phos2_nonuni_sc14_5 Phos2_nonuni_sc14_6

download Download this batch [0.5MP / 852 x 567 / 8.7 MB]

Scene 15



UNIFORM illumination

Underexposed (EV)
-4 -3 -2 -1
Phos2_uni_sc15_minus_4 Phos2_uni_sc15_minus_3 Phos2_uni_sc15_minus_2 Phos2_uni_sc15_minus_1

Correct Exposure
Phos2_uni_sc15_0

Overexposed (EV)
+1 +2 +3 +4
Phos2_uni_sc15_plus_1 Phos2_uni_sc15_plus_2 Phos2_uni_sc15_plus_3 Phos2_uni_sc15_plus_4

 

NON - UNIFORM illumination
Directional +
Uniform
Directional +
0.8 Uniform
Directional +
0.6 Uniform
Directional +
0.4 Uniform
Directional +
0.2 Uniform
Directional
illumination only
Phos2_nonuni_sc15_1 Phos2_nonuni_sc15_2 Phos2_nonuni_sc15_3 Phos2_nonuni_sc15_4 Phos2_nonuni_sc15_5 Phos2_nonuni_sc15_6

download Download this batch [0.5MP / 852 x 567 / 8.1 MB]