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I'm trying to compute the focal length for different field of views of a camera.
Therefore I need the sensor size horizontally and vertically, but in the datasheet I only have the following information: 1/3" 2.4 MP image sensor. The image size is 1920x1080 if that's needed.
How do I get the size of the sensor?
It is not possible to calculate the sensor size with that information because the 1/3" measurement refers to the diameter of a hypothetical tube that would enclose the sensor. That sets a limit on the diagonal of the sensor but it not an exact fit.
The the sure way to know the sensor-size is to measure it or find the part number and look at specifications of that particular sensor from the manufacturer.
There are common approximations and Wikipedia has 4.8 x 3.6mm for a 1/3" sensor with 4:3 aspect-ratio but you will need to figure out if that matches your sensor and what region was cropped to get the 16:9 aspect-ratio of your images. Sometimes, only the vertical dimension is cropped but sometimes both, effectively creating an equivalent of a smaller sensor. There are native 16:9 aspect-ratio sensors too, and they can fit into 1/3" but that could be wider than 4.8mm.
I found this at the Digital Camera Database
Another list is at the Wikipedia article for Image sensor format
Which both say for 1/3": 4.8 x 3.6 mm
