Two-pulse (TP) dataset

The present page describes the input data as well as rules for submitting results (with corresponding download/upload links in the left panel). Published results are presented in this page.

1. Input data

1.1. Camera calibration

Camera calibration can be performed by downloading the ASCII file CalibPoints.txt. Each line of this file contains the coordinates of a point in the domain together with its projections on the four cameras :

X Y Z x1 y1 x2 y2 x3 y3 x4 y4

where (X,Y,Z) are the point coordinates in units of mm and (xi,yi) the coordinates of its projection on camera i in units of pixel.

For more information about the virtual camera system, see the parent page First LPT and DA Challenge

1.2. Cases and images

The zip archive contains images corresponding to seeding densities equal to 0.005, 0.025, 0.05, 0.08, 0.12 and 0.16 ppp (one folder per density). For each density, one pair of images is given for each camera. Images are stored in 16-bit TIFF compressed format, with file naming built on model

TP_ppp_0_AAA_IBBBB_C.tif

where AAA is the fractional value of the seeding density in ppp (e.g. 160 for 0.16 ppp images), BBBB is the snapshot number, and C the camera number, the latter labelled from 0 to 3.

The snapshot numbers are here 0000 and 0001, and each file contains a single exposure. The images are separated by an inter-frame time Dt = 600 µs.

One Dt corresponds to a maximum of about 7 pixel displacement in the camera images. Some typical camera noise is added to the images. A constant particle image size (PSF or OTF) is used. The measurement volume is illuminated as a uniform slab of light with a cross-section in XZ of 100x30 mm² extending along the Y axis. The measurement volume of 100x50x30 mm3 is completely visible by all four cameras with some extra particles outside the measurement volume visible in the Y direction (up to about +/- 35 mm).

2. Requested cases and formatting rules for upload

Clicking on "Submit TP results" will open a form allowing you to upload a file containing your results. This file should be a zip archive, with name corresponding to the short name or acronym of the algorithm used to process the results. This short name and acronym should also be indicated in one of the fields of the upload form and both should match, including for upper and lower case letters (see below). It should contain one result file per seeding density, each being an ASCII file, with the following naming convention

XXXXX_TP_ppp_0_AAA.dat

where XXXXX corresponds to the short name or acronym of your algorithm, as indicated in a field of the upload form (i.e. both should match, including for upper and lower case letters), and AAA is the fractional value of the seeding density in ppp as for the image files.

The format of each ASCII result file should be as follows. First line equal to

X0 Y0 Z0 X1 Y1 Z1

followed by one line for each particle with the two measured particle positions X0, Y0, Z0 and X1, Y1, Z1 in mm for time steps t0 and t1. There is no specific convention about number formatting. A sample archive with example files is avaialable for download (case of an algorithm with short name myAlgo).

The zip archive should mandatorily contain result files at least for seeding densities equal to 0.005, 0.025, 0.05 and 0.08 ppp (note that this is slightly different from the actual 1st LPT Challenge). Any incomplete submission will be rejected. Additionally to these mandatory densities, participants are also encouraged to process other ones. In that case, all densities up to the highest one chosen should be supplied.

The upload form should be filled with the following information, which is used for result presentation in case of publication:

  • the short name or acronym of the algorithm used for data processing (should match with the name of your zip archive, including for upper and lower case letters, and with the prefix name of your result files). This name should have a length of 24 chars maximum, contain no space. Authorized chars are alphanumeric chars and one of the following:  [  ]  _  -  @
  • the full name of the algorithm. This name should have a length of 100 chars maximum, and should not contain commas.
  • Optionally, you may provide the URL address of the publication (if any) about your algorithm, or of a webpage describing it