計算ip camera viewing angle公式
1/3" CCD will have a wider viewing angle(15°more) than 1/4" CCD.In general, 2.5mm~2.8mm is suitable for shooting distance that is less than 15 ft[b] CCD size and Lens focal length will affect the viewing angle. The following table is a summary of viewing angle for different CCD and Lens.[/b] [table=61%] [tr=#adbadb] [td=1,1,25%] [/td] [td=1,1,26%]1/4" CCD (Dome type)[/td] [td]1/3" CCD (Dome type)[/td] [td=1,1,24%]1/3" CCD (Standard type) [/td] [/tr] [tr] [td]2.5mm[/td] [td]95[/td] [td]130[/td] [td]120[/td] [/tr] [tr] [td]3.6mm[/td] [td]70[/td] [td]90[/td] [td]-[/td] [/tr] [tr] [td]4mm[/td] [td]-[/td] [td]-[/td] [td]70[/td] [/tr] [tr] [td]4.3mm[/td] [td]60[/td] [td]80[/td] [td]-[/td] [/tr] [tr] [td]6mm[/td] [td]50[/td] [td]70[/td] [td]53[/td] [/tr] [tr] [td]8mm[/td] [td]35[/td] [td]50[/td] [td]40[/td] [/tr] [tr] [td]12mm[/td] [td]25[/td] [td]30[/td] [td]25[/td] [/tr] [tr] [td]16mm[/td] [td]20[/td] [td]25[/td] [td]20[/td] [/tr] [tr] [td]25mm[/td] [td]9[/td] [td]15[/td] [td]12[/td] [/tr] [/table]
[b]To select a suitable lens please follow the following steps <A> Measure the distance between the camera and the shooting target. We call this the viewing distance--L <B> Measure the viewing width--W. Use the following trigonometric formula to find out the viewing angle. [/b] [b] Viewing angle = 2 * Arc tan (W/2L)[/b]
頁:
[1]