| | 24 | |
| | 25 | == Using averages == |
| | 26 | |
| | 27 | For all the following operations all files must have the same mesh structure (ie. number of vertices). It is best to warp a standard shape into all the files you want to use using the Batch Warp method before constructing the averages, comparing and transforming. |
| | 28 | |
| | 29 | Compare individual:: |
| | 30 | Compare a single subject to an average. You should have the subject loaded and you are prompted for the average. The results show the Manhalobis distance of each point from the average as a colour i.e. the distance scaled by the shape of the distribution. |
| | 31 | |
| | 32 | Compare averages:: |
| | 33 | Compare two averages using Hotelling's T^2 test at each vertex (related to the Student's t-test for 1D distributions). Shows the facial areas where the samples are significantly different. |
| | 34 | |
| | 35 | Transform:: |
| | 36 | Adds the differences between two surfaces (usually averages) to alter a facial surface. You are prompted for the two (average) surfaces and the amount to scale the differences by. e.g. to change a female face to their male equivalent load the subject's (standard) mesh, select Transform, load the female then the male average when prompted, then set the change to 1 (100% of the difference between the two). |
| | 37 | |
| | 38 | View Morph: |
| | 39 | Loads a sequence of (aligned) faces over time. The text file should have the name of the file to use and the time point of each on each line. The times should be ordered in increasing value starting at 0 e.g. |
| | 40 | {{{ |
| | 41 | face0.obj 0 |
| | 42 | face1.obj 10 |
| | 43 | face2.obj 40 |
| | 44 | face3.obj 45 |
| | 45 | face4.obj 60 |
| | 46 | }}} |
| | 47 | A dialog will be displayed allowing the morph frame to be selected or the sequence animated (using the play button). |
| | 48 | |
| | 49 | == Shape PCA == |
| | 50 | |
