How is FOV defined？？？
I want to know，when defining the FOV, chose the midpoint of the edge or the end point？
as the photo show：
left or right?
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Hi Huangxunheu Pages 86-87 of the data sheet document for the RealSense 400 Series cameras provide information regarding how the FOV is calculated.
https://dev.intelrealsense.com/docs/intel-realsense-d400-series-product-family-datasheet
Where the FOV 'triangle' lands on the observed surface will depend upon how far the camera is from the observed surface and which RealSense camera model you are using, as the size of the viewpoint varies between models. For example, D415 has a small FOV (meaning it can see less of the scene in front of it) whilst D455 has a wide FOV. Page 69 of the data sheet has a list of FOV sizes for each camera model and its sensors.
In regard to your two FOV drawings, left (focused on the midpoint) looks more typical of a RealSense FOV.
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@MartyG， thanks for your reply, you said "In regard to your two FOV drawings, left (focused on the midpoint) looks more typical of a RealSense FOV." , I need a definite answer . I saw the document and can't find the definition。
And i find this post About make sure FOV specification of D435i – Intel RealSense Help Center , as the picture show , the define of FOV loos like endpoint?
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Thanks very much for the clarification provided by the link. In the earlier drawings it looked as though it represented the camera FOV being pointed at a flat board object. Apologies for the misunderstanding.
The origin point of images is the center-line of the camera sensor. The FOV extends left and right, and above and below the sensor, so the FOV is like a cone that widens out from the center of the sensor, like in the FOV images at the link that you provided.
This is why I said that the midpoint version of your FOV drawing represented a typical RealSense FOV, because the camera will capture not only what the center-line of the sensor is looking towards but also the detail in the real-world scene that is above and below that center-point.
The extent to which the FOV size and shape can be controlled is limited. For example, the FOV of an image increases as resolution increases (so a 1280x720 image will show more of the scene to the left-right and up-down of the center than a 640x480 image does) and you can also "crop" the X and Y of the image to reduce the size of the view. In regard to the FOV size of the physical sensor though, that is a fixed size.
If the above explanations do not answer your question then please provide more information about what you are attempting to define. Thanks very much for your patience!
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Thank you very much for your quick reply。
I think i got the answer.
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