NED
RCDL4K8GE
UME-0111-01
82
4.8 Pixel Correction
Generally speaking, image sensors (CCD, CMOS and so on) have fixed pattern
noise and photo response non-uniformity. When you use the lens,
lens shadings
and light sources also can cause non-uniformity. The camera is set to the optimal
correction before shipping in order to provide images of high grade. The camera
also has the function of user white correction to cope with lens shading and
non-uniform illumination.
Cal_bl : Output data of each pixel at perfectly dark (factory correction)
Cal_wh : Output data of each pixel in uniform illumination (factory correction)
or in taking a picture of subject for correction (user white correction)
Target_Val : Target value for user correction (10bit output conversion value)
Vin:Input data (Before correction) Vout :Output data (After correction)
The corrected data is expressed in the following equation.
Vout=(Vin-Cal_bl) x Target_val / (Cal_wh-Cal_bl)
Image “before” user arbitrary pixel Green line is Luminance Profile
is corrected.
Image “after” user arbitrary pixel Green line is Luminance Profile
is corrected.
Figure 4-8-1 Waveform and image before and after bit correction
Luminance Profile
Содержание GiGE VISION RCDL4K8GE
Страница 17: ...NED UME 0111 01 RCDL4K8GE 17 The dimensions for camera are shown below Figure 2 2 1 Dimensions F Mount...
Страница 55: ...NED UME 0111 01 RCDL4K8GE 55 Figure 4 2 6 2 Color Transformation Value Selector...
Страница 91: ...NED UME 0111 01 RCDL4K8GE 91 Revision History Revision Number Date Changes 01 01 Oct 2020 Initial release...