Q. What kind of cameras can I use?
A. Any digital camera (make/model) should do just fine.
Q. How many pictures do I need to take?
A. You need to take two pictures.
Q. Can I take pictures by holding the camera sideway?
A. Yes, but you must be consistent in the way you take the two pictures.
Q. How should I take these two pictures?
A. Take one picture of the objects that you want to measure, and then walk sideway a few steps and take another picture. Maintain roughly the same distance to the objects in the two shots and do not pan the camera too much (the viewing directions of the two shots should be roughly parallel). Do not change any setting on the camera; just point and shoot.
Q. Can I walk forward or backward instead of sideway?
A. It is not recommended that the two pictures be taken with a front-and-back movement. A roughly sideway motion can better ensure high metrology accuracy.
Q. Do I need to use a tripod?
A. It is not necessary to use a tripod, as long as the camera can be held steadily with no shaking or vibration.
Q. Should I use flash?
A. Flash is not necessary if there is sufficient lighting. However, you should use flash if there is not enough lighting. If you use flash, make sure that flash is on for both pictures.
Q. What picture resolution should I use?
A. We recommend at least 1M (e.g., 1280x960 or 1600x1200) for indoor scenes and at least 2M (e.g., 2048x1536 or 2560x1920) for outdoor scenes.
Q. What focal length (or field of view) should I use?
A. You can use any focal length setting as long as the objects to be measured are clearly visible and of a good size (not too small) in both pictures. Do not change the focal length setting in the two pictures.
Q. When taking pictures, how far away should I stand from the objects to be measured?
A. Stand at a distance so that the objects to be measured are clearly visible and of a good size (not too small) in the two pictures.
Q. Can objects move in the two pictures?
A. Objects in the pictures can move. However, you can only measure the dimensions of stationary objects, not moving objects, in the pictures.
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