Camera Lens FOV and Pixel Density (DORI)
The horizontal field of view, scene width, and pixel density of a surveillance camera, screened against the IEC 62676-4 DORI bands (Detect 8 / Observe 19 / Recognize 38 / Identify 76 ppf). FOV = 2 x atan(sensor / 2 focal); scene = distance x sensor / focal; ppf = pixels / scene. A 5.37 mm sensor, 4 mm lens at 30 ft with 1920 px gives a 67.7 deg FOV over 40.3 ft and 47.7 ppf -- Recognize but not Identify; an 8 mm lens halves the scene and reaches 95 ppf (Identify). A design aid; verify against the lens chart and a live view.
Formula and source
fov = 2 x atan(sensor_width / (2 x focal_length)); scene = distance x sensor_width / focal_length; ppf = h_pixels / scene; DORI band by ppf (8 Detect / 19 Observe / 38 Recognize / 76 Identify).
IEC 62676-4 (Video surveillance systems - Application guidelines) DORI criteria, by name; first-principles thin-lens field-of-view geometry.
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