Resources

How-to videos

You can find videos on how to start TecPIV, create a project and start the ananlysis here.

Sample Images

Please note that my images are very large (70 Mb). The tarballs include only 5 or 6 images of the model plus one of the calibration board. Follow the procedure presented in the video to get started with these data sets.

DNG images from side. (use only poly 3 distortion correction) with calibration image. The calibration board uses 15×15 mm squares. There are 30 squares along the horizontal axis (X) and 20 along the vertical axis (Y). TIF images from side. Same test but already converted to 16-bit tif files.

The purpose of this test is to load and calibrate views that are nearly orthogonal to the surface area to monitor (here the side of the tank). The views are not suitable for vector calculation, but the distortion can be removed, the contrast adjusted and the image stack exported as png, pdf or avi.

DNG from surface (use projective + poly 3 rectification+correction) with calibration image. The calibration board uses 15×15 mm squares. There are 30 squares along the horizontal axis (X) and 28 along the vertical axis (Y). The views are suitable for vector calculation. TIF images from surface.

Making calibration board

I use the extension for Inkscape to make checkerboards: https://github.com/jeffkayser/inkscape-checkerboard

Make you calibration board with even numbers of rows and columns, and print it. Stick it to a flat surface and take the photo. Enter in TecPIV the size of each square (I generally use 1 cm to 1.5 cm for a surface area 20 by 30 cm to 50 by 50 cm) and number of squares along sides between the four corner points (see video). These are the number of squares along side minus two.

Note that the relative position of the camera and calibration board must be the same as the relative position of the camera and face of the model that you want to monitor. For surface views I calibrate above the model surface, and measure the distance between the model surface and height where the calibration board was during calibration procedure. Then I lower the camera by this exact distance so the model surface is where the calibration board was relative to the camera.