This function operates in frequency domain and requires for 32 bit avisynth+ FFTw3 32 bit dll or for 64 bit avisynth+ FFTw3 64 bit dll. As these dll s are not thread safe this function operates in MT_SERIALIZED state.
F2QCorrelation function has 2 input clips and dsplays centered correlation in image domain. Gamma enables display in proper amplitude. The correlation maximum point coordinates frame wise can be output in a txt file. This works only if txt is set true and a valid output file name with complete path is specified. Note the video file need to be closed to get the full file output.
Only Green color of RGB formats is used, in case of other formats Y plane is used for correlation.
It may be noted internally the frame size may be increased for optimization of fft and this optimized size frame is output.
| Description | Name | Type | Limits | Default |
| Input referance A clip | clip | must have the fields separated | none | |
| Input B clip | clip | must have identical format and dimensions of A clip | none | |
| gamma scaling for viewing convenience | gamma | float | 4.0 | |
| Whether correlation text file to be generated. | txt | boolean | true false. | false |
| Full path and name of text file to be generated. | file | string | a valid file name must be specified if txt is set true | none |
| frame number from which text file to be output. | sf | int | within video | 0 |
| frame number up to which text file to be output. | ef | int | within video and not less than sf | end frame of video |
| intervals of frames for text output. | every | int | ensure not more than 1000 records are output | (ef - sf) / 1000 + 1 |
# for text file output F2QCorrelation(b,a, 4.0, true, txt = true, file = "C:\Documents\corr.txt") #for visual output only F2QCorrelation(b,a, 1.6, true)
loadplugin("......./F2QPlus.dll")
loadplugin("......../Grid.dll")
a = addborders(last,0,0,160,148)
b = addborders(last,160,148,0,0)#.invert()
F2QCorrelation(b,a, 4.0, true)
# grid axis display to aid visual estimate
grid(grid = false,axis = true,color = $ff, bcolor = $ffff, vbcolor = $ffffff)
| To my index page | down load plugin | To Avisynth |