i try to do some cemera tracking.
i record a video with my galaxsy s3 mini and i dont know what to write in the sensor size and the focal length,
i find this information:
Sensor Type 1/3.2-inch
Sensor Architecture Type BSI-CMOS
Sensor Size 4.54×3.42 mm
Total Effective Pixels 8MP
Sensor Model Name S5C73M3
Max. Image Resolution 3264×2448 pixels
Crop Factor 7.6×
Lens 3.7mm (28mm) f/2.6
what i need to write in the cemera sensor width- 4.54 or 3.42?
and what i need to write in the focal length - 3.7 or 28?
what i need? the first or the full frame equivalent?
Either will do
what the diffrent betwwen them and when i need to use each other?
In photography sometimes focal lengths are described as the equivalent to having a full frame camera (a sensor the same size as the old 35mm film). It’s one way to compare the focal length of lenses when you have cameras with different sensor sizes. You do not have to care about this.
to be a bit nitpicking:
the focal length stays the same, but the Field of View (FOV) angle is depending on the sensor size. so the 3.7mm focal length on the small sensor will give you the same FOV like a 28mm on the full frame sensor.
What it will change is the nature of depth of view. To model camera and lens correctly you need the correct focal length and sensor size, otherwise using right aperture size will give you wrong dof when compared with filmed footage. But from simply technical point of view it does not matter if you scale both focal length and sensor size with some constant, solve will be identical.