Question: What happens if I got bad results? 

Answer:

There are a number of things that you can try, including

 * Use a higher camera resolution

 * Use a larger focal length (or smaller field of view)

 * Use a larger sideway movement

 * Do not pan the camera too much (i.e., the viewing directions of the two shots should be
    roughly parallel)

 * Make sure that the objects you want to measure are sufficiently large in the photographs

 * Turn the flash on to obtain high quality images

 * Select a larger reference and measure its length carefully

 * Exercise care in marking the feature locations (using a high zoom)

 * Combinations of all above

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