ZED / focal length ; Size of sensors ; Size of a Photosite

[gauthier-duponchel]

In order to calibrate each camera of the ZED using MicMAc, I need those informations :

• focal length (mm)
• sensor size ( px . px )
• photosite size (m)

Gauthier

[WASCHMASCHINE]

Open the ZED Explorer -> Settings -> Calibration, or just look at the calibration file of your camera. I think you can derive your values from there for each setting (edit: with the pixel sizes below).

[gauthier-duponchel]

In the SNxxxx.conf file [calibration file], I can find fx and fy which are [I think] the projection of the optical center on the sensor but I do not see the focal length in meters which should be a kind of fz.

Concerning the sensor size, there is unfortunately no information concerning the size in m.

Gauthier

[adujardin]

Hi, Here is the pixel size by resolution:

• HD2K (2208x1242) : 0.002mm
• HD1080 (1920x1080) : 0.002mm
• HD720 (1280x720) : 0.004mm
• WVGA (672x376) : 0.008mm

[gauthier-duponchel]

Thank you!!

What about the focal length ? What are fx & fy in the SNxxxx.conf file / focal length ?

Gauthier

[gauthier-duponchel]

Thank you!

What about the focal length ??

In the SNxxxx.conf file I can find fx and fy but I think they are the coordinates of the optical center projection on the sensor. What I search is the focal length (fz if you see what I neam).

Gauthier

Hi, Here is the pixel size by resolution: HD2K (2208x1242) : 0.002mm HD1080 (1920x1080) : 0.002mm HD720 (1280x720) : 0.004mm WVGA (672x376) : 0.008mm

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[adujardin]

The focal length is 2.8mm.

You can also compute it from the focal in pixels in the SNxxxx.conf :

• f_mm = (fx+fy) / 2 * pixel_size_mm

[gauthier-duponchel]

OK! Thank you again, Gauthier.