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发表于 2008-3-27 16:45:56
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Hi.
The LW/PH means line width per picture height. It means how many lines can be fill in your picture.
For example, If your resolution is 640 x 480, then the max line width (LW) is 480. This means
each pixel can represent one line.
The lp/mm means line pair per mini-meter. The concept is the same as LW/PH just the different
unit. First we convert the Lp and LW. LW means line and Line pairs means a pair of black line and
white line. It can be easy to convert the LP and LW ==> LP = 2 LW.
And mm means mini-meter. Hence how to convert the PH to mm ? First check the sensor data
sheet to see the pixel size.
For example, if the 640x480 pixel size is 2.2 um, then you can know the PH = 640 * 2.2 um.
And LW / PH = LW / (640 * 2.2 um) = LW / 1.408 mm = (2/1.408) LP / mm
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