Graphics: Visual and Interactive Computing

Comparative Visualisation: Path Finding

This page provides data that is used in our path-finding study and some of our testing results. Further details of the data and tests can be found in our paper to appear in IEEE Visualization 2002 and Mr. Hualin Zhou's thesis.

Comparison Space: M x V x E

Metrics subspace M = {M1, M2, M3, ..., M11}

  • M1: Means Squared Error (MSE)
  • M2: Normalized Means Squared Error (NMSE)
  • M3: Template Matching (TM)
  • M4: Spatial-Frequency Domain plus Mannos-Sakrison's Filter (FFT-M)
  • M5: Spatial-Frequency Domain plus Daly's Filter (FFT-D)
  • M6: Spatial-Frequency Domain plus Ahumada's Filter (FFT-A)
  • M7: 2nd-Order Fourier Comparison (FFT-2)
  • M8: Human Vision System pipeline with Mannos-Sakrison's Filter (HVS-M)
  • M9: Human Vision System pipeline with Daly's Filter (HVS-D)
  • M10: Human Vision System pipeline with Ahumada's Filter (HVS-A)
  • M111: Daly's Visual Difference Predictor (VDP)

Visualisation subspace V = {v1, v2, v3, ..., v20}

Ambient light only:
v1, v2, v3, v4 Diffuse reflection only:
v5, v6, v7, v8 Specular reflection only:
v9, v10, v11, v12 Flat shading:
v13, v14, v15, v16 Gouraud shading:
v17, v18, v19, v20

Experiment subspace E = {e1, e2, e3, ..., e8}

Esim:
e1: cue ball e2: golf ball e3: basket ball e4: tennis ball
Edif:
e5: render cube e6: photo: portrait e7: photo: teapot e8: Guassion noise

Effectiveness of Comparison Metrics

Comparison  Methods                      Mean                      STD Delta
Vsub xE VsubxE sim VsubxE dif VsubxE VsubxE sim VsubxE dif
M1:MSE 0.661 0.551 0.770 0.207 0.166 0.186 0.219
M2:NMSE 0.657 0.463 0.850 0.253 0.107 0.257 0.387
M3:TM 0.490 0.231 0.750 0.338 0.124 0.278 0.520
M4:FFT-M 0.457 0.296 0.617 0.232 0.133 0.163 0.320
M5:FFT-D 0.512 0.347 0.676 0.257 0.133 0.246 0.330
M6:FFT-S 0.581 0.405 0.757 0.264 0.157 0.232 0.352
M7:Fourier 0.495 0.187 0.802 0.336 0.0931 0.182 0.615
M8:HVS-M 0.643 0.449 0.837 0.245 0.121 0.172 0.388
M9:HVS:D 0.779 0.566 0.992 0.275 0.162 0.183 0.427
M10:HVS-S 0.795 0.581 1.008 0.277 0.157 0.193 0.427
M11:MC 0.767 0.497 1.037 0.506 0.374 0.478 0.540

Effectiveness of Rendering Conditions

Rendering Conditions(V)              MxE            MxEsim            MxEdif Delta
STD Mean STD Mean STD Mean
Ambient Light only:V1-4 0.718 0.366 0.518 0.237 0.917 0.364 0.399
Diffuse Reflection only:V5-8 0.566 0.328 0.317 0.185 0.815 0.238 0.498
Specular Reflection only:V9-12 0.656 0.273 0.515 0.209 0.797 0.258 0.282
Combined Illumination (Constant):V13-16 0.584 0.305 0.367 0.170 0.802 0.250 0.435
Combined Illumination (Gouraud):V17-20 0.583 0.308 0.362 0.172 0.804 0.250 0.442