1. Sample Pictures with Fringe Projection 3D-Surface ProfilingSample Surface Holes were covered with sticker Black markers do not affect the results.

2. Results 3-D view of the surface profile

3. Principle of object detection Find circles using circular Hough transform Since holes has darker color, an mask filter that based on intensity will be created Only dark circular object w will be selected

4. Measure a hole After a circular object has been detected, the program will return it`s radii and center. There is a ruler stick on the plate, and there is a draggable distance tool. Drag the two endpoints of the distance tool to the two inch line and three inch line on the ruler. The program will return a pixel distance. Radii/(pixel distance) = radii in mm, then the area in inch square will be calculated Note: In this picture, 10 millimeters is 169 pixel-distance

5. Algorithm In this example the program will return the radii(64 pixel-distance) for the hole on the left corner. The radii in mm will be calculated as 64(radii in pixel-distance)/169(pixel distance for 10mm)*10 = 1.91mm From left to right

6. Rivet detection Very similar method to detect a rivet, but different than the hole, rivet has brighter color. NOTE: 10 millimeters in this picture is 166 pixel-distant.

7. Calculation

8. height of rivet Tape a piece of metal next to the rivet, and measure the thickness of the metal.

9. Height of the rivet Specify a region on the metal and calculate mean of phase shifting index, and then select a area on the rivet. Note: the thickness of the metal piece is 0.59mm, and diameter of the rivet head is 9.52mm

10. Result Index of rivet * mm/index will get the height of rivet