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The image below shows the relationship between focal length of the camera, the field of view and the size of the sensor.

You will also receive a free Computer Vision Resource guide and instant access to code used in all tutorials in my blog.Another way to activate a laptop web camera is to start using it through an instant messenger service like Skype, Yahoo, MSN or Google Talk.With over 8 million downloads, Alfred is without a doubt one of the fastest­-growing home security solutions on the market.In our newsletter we share Open CV tutorials and examples written in C /Python, and Computer Vision and Machine Learning algorithms and news.We’re committed to saving the lives of rescues and helping them find their forever homes.Through our partnership with SF SPCA and a network of shelter partners, we donate our cameras and a portion of our proceeds to support rescues in North America and internationally.

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You rush to plug that number into the equation you just learned but you are a bit confused. The specification refers to the Diagonal Field of View ( DFOV ).

It is obvious to you that since the aspect ratio is 16:9, the horizontal field of view is larger than the vertical field of view. The DFOV (see figure below) is the angle subtended by the diagonal of the camera sensor onto the center of the lens.

Now let’s say you have additional information about your camera.

For example, Logitech c920 camera specification states that it has a field of view of 78 degrees.

Turns out Apple doesn’t publish the specifications like ( focal length, sensor size etc. I did not need the exact value of the focal length, an approximate value in pixel dimensions was all that I was looking for.