Instructions for the analysis of case E:
Shear Field
28.10.2000 okamoto@tokai.t.u-tokyo.ac.jp
Flow Field
* The flow field was shear field generated by computer.
* The field parameter is not known.
* The non-uniform illumination condition was simulated.
Image generation
* The particle scatter was assumed to be the gaussian distribution.
* The occlusion particle was considered.
The intensity of the particles were linearly added.
* Fill factor was assumed to be 0.7.
* Particle diameters were randomly determined.
The histogram of the particle diameter was gaussian distribution.
* Laser light sheet intensity was assumed to be gaussian.
Maximum out-of-plane velocity was set to be about 20% of
laser light thickness.
* Illumination intensity was varied.
* The image size is 256 x 128 pixel. They are provided in tif format with a
header of 285 bytes.
The reference analysis for this case is :
:ev_IS_size_x = 16;
:ev_IS_size_y = 16;
:ev_IS_size_unit = "pixel";
:ev_IS_grid_distance_x = 8;
:ev_IS_grid_distance_y = 8;
:ev_IS_grid_distance_unit = "pixel";
:ev_origin_of_evaluation = 8, 8;
:ev_origin_of_evaluation_units = "pixel";
:ev_IS_offset = 0, 0;
:ev_IS_offset_units = "pixel";
:ev_cf_fill_ratio = 0.7;
The mandatory data to be provided are :
Raw data : E00?_team_ref_raw.nc
- the raw velocity field corresponding to the highest correlation
peak outside the mask (raw)
- the corresponding histogram ,
- 3 samples of correlation windows at
x(pixels) y(pixels)
32 32
32 64
32 96
- a matrix of correlation peak height
- the type of processor used
- the processing time per velocity vector
- Velocity distribution on the following vertical line
x = 64
x = 160
x = 208
x = 224
- Velocity distribution on the following horizontal line
y = 64
Post processed data : B00?_team_ref_clean.nc
- the post-processed velocity fields without interpolation
and/or filtering with the corresponding histogram (clean),
- a flag matrix giving the location of spurious vectors and holes
- a matrix of correlation peak height
- the mean velocity over the map (Umean, Vmean)
- the standard deviation over the map (u', v')
- the total number of valid vectors
- the type of processor used
- Velocity distribution on the following vertical line
x = 64
x = 160
x = 208
x = 224
- Velocity distribution on the following horizontal line
y = 64
Interpolated data :
Interpolated velocity map is optional for this set.