respect

Several potential customers requested information on cameras and how to get accuracy with Rhinophoto...

The camera :

More the sensor is large and the quality of photo is good (no noise, black color is black, white is white...) better is the accuracy and ease of use.
Two examples bellow :
A zoom on photos of a good cameras (Nikon DSLR)
good01.jpggood02.jpg

Some "poor" cameras (Compact camera)
bad01.jpgbad02.jpg
You can understand easily that the accuracy and reconstruction will be less good with the second ones...

The lens used :

A fixed focal lenght gives always better results :  More the lens is simple, better the accuracy is, a zoom lens have a lot of lens and gaps inside.
The best lens for photogrammetry are : fixed 24mm focal length.

The Quality of camera calibration :

The grid have to be perfectly flat and the process have to be exactly like the documentation.

The number of reference bar used :

eg. If you use 3 Reference bar well positionned (eg : two at each ends + one in the middle of the hull) Rhinophoto use these 3 known values to "Conform" the scene, and force the 3 values to be exact, that give the best accuracy.

The number of photos and number of targets :

the more there are targets and photos the better it is. To see the videos
How to Positon Coded Targets  http://www.rhinophoto3d.com/files/videos/Rhinophoto_V3_Training_Position_Targets_en.html
and
How to Take the Shots http://www.rhinophoto3d.com/files/videos/Rhinophoto_V3_Training_How_to_Take_Shots.html

The quality of photos :

if photos are well centered, taken with angle... it increase the accuracy

The sensor resolution :

higher the resultion is, better it is. But, important, it is preferable to have good sensor with lower resolution than hi-resolution with noise and no contrast. eg a Nikon DSLR 12 Megapixels is better than any compact camera 16 Megapixels.

The size of sensor :

the bigger it is, the better it is .
For example we have made several tests with different Nikon DSLR cameras :
- The more accurate is the Nikon D700 + 24mm f2.8D Nikkor lens (a big plus : the large sensor give a wide angle very easy to take shots and get projects) Price ~ 2600/3000€
- Then Nikon D300S + 24mm Nikkor Price : ~1800€
- Then Nikon D7000 + 24 mm Nikkor Price : ~1600€  (Good quality/price ratio, very close to the D300s in Quality of digitizing)
- Then plastic body Nikon DSLRs...  D5000+ 18/55 lens then D3100 + 18/55 lens Price ~500/600€ but lens are less accurate
If possible buy a NON VR lens (VR is Vibration Reduction and move lens inside, not good for photogrammetry, even if this VR feature is de-activated