Changes between Version 202 and Version 203 of UvmatHelp


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Timestamp:
May 3, 2018, 11:39:12 AM (3 years ago)
Author:
sommeria
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  • UvmatHelp

    v202 v203  
    779779== 11 - PIV: Particle Imaging Velocimetry == #Civ
    780780=== 11.1 Overview ===
    781 PIV can be performed by selecting the Matlab function ''civ_series'' as '''[!ActionName]''' in the GUI '''series.fig''': then the '''GUI civ_input''' appears to enter the processing parameters. An image file series must have been entered as input of '''series.fig''', or alternatively a Netcdf file resulting form a previous PIV processing (with conventions '''civdata''').
    782 
    783 An alternative possibility is to use the older Fortran program ''CivX'' from the GUI '''civ.fig'''. This can be called directly on the Matlab prompt, by typing  ''>>civ'', or from UVMAT by the menu bar command '''[RUN/PIV (old civ)]'''.
    784 
    785 '''- Modes of frame pair indexing''': A first menu '''[!ListCompareMode]''' on the top left selects one among four modes of operation:
    786 
    787  * '''PIV''': makes image comparisons on sliding index pairs, as usual for measuring velocities by particle displacements. A second menu '''[!ListPairMode]''' in the panel '''[!PairIndices]''' then selects one among three possibilities (not always available depending on the file indexing):
     781PIV can be performed by selecting the Matlab function ''civ_series'' as '''[!ActionName]''' in the GUI '''series.fig''': then the '''GUI civ_input''' appears to enter the processing parameters. An image file series must be entered as input of '''series.fig'''.
     782
     783An alternative obsolete possibility (not advised) is to use the older Fortran program ''CivX'' from the GUI '''civ.fig'''. This can be called directly on the Matlab prompt, by typing  ''>>civ'', or from UVMAT by the menu bar command '''[RUN/PIV (old civ)]'''.
     784
     785'''- Modes of frame pair indexing''': PIV is performed by comparing two images in a pair. The images are generally labelled by two indices i and j, see [#a3.3Filenamingandindexing: section 3.3]. A first menu '''[!ListCompareMode]''' on the top left selects one among four modes of operation:
     786
     787 * '''PIV''' (default): makes image comparisons on sliding index pairs, as usual for measuring velocities by particle displacements. A second menu '''[!ListPairMode]''' in the panel '''[!PairIndices]''' then selects one among three possibilities (not always available depending on the file indexing):
    788788   * ''pair j1-j2:'' selects a given j index pair (sometimes denoted by letter index) for the whole time series. This is the most common case for PIV. Pair selection is performed in the menu '''[!ListPairCiv1]''' and '''[!ListPairCiv2]''' for the second iteration Civ2, see below. If timing from an XML file <!ImaDoc> has been detected, this is indicated in the edit box '''[!ImaDoc]''' and the corresponding time intervals are indicated (in ms). For some applications, this time interval may evolve in time, so that reference indices ref_i and ref_j are chosen for the display.
    789789   * series (Di): selects a given  index interval for the i index, around a set of reference i indices. The intervals are denoted Di=0|1, -1|1, -1|2, -2|2 ... , corresponding to the index pairs i|i+1, i-1|i+1, i-1|i+2, i-2|i+2 ...around each reference index i. Pair selection is then performed in the menu '''[!ListPairCiv1]''' and '''[!ListPairCiv2]''' like for 'pair j1-j2'.
     
    947947 * nb_bounds=2 represents the lower and upper bound of each coordinate
    948948 * nb_subdomain_1 is the number of subdomqins used for patch
    949  * nb_tps_1 maximum number of tps centres in subdomains 
    950  *          For civ2, all indices _1 are replaced by _2
     949 * nb_tps_1 maximum number of tps centres in subdomains
     950 * For civ2, all indices _1 are replaced by _2
    951951
    952952- '''List of constants, old CIVx conventions:'''