VC Camera Link series
Page 49 of 86
RA14-11A-010
8.9
Flat Field Correction
(VC-2MC-340/VC-4MC-180/VC-12MC/VC-25MC/VC-25MC2 Only)
The Flat Field Correction feature improves the image uniformity when you acquire a non-uniformity image due to
external conditions. The Flat Field Correction feature can be summarized by the following equation:
IC = IR / IF
Where,
IC :
Level value of corrected image;
IR :
Level value of original image;
IF :
Level value of Flat Field data.
In order to use the Flat Field Correction feature, one must first generate IF, the Flat Field data. This can be done
by adjusting the camera to the actual environment and activating the Flat Field Generator. The Flat Field
Generator will standardize a series of images, curtailing the image to 1/16 pixel, generate the curtailed Flat Field
data, and store it in the internal frame buffer of the FPGA. When curtailed images are used for corrections, it is
expanded and applied with a Bilinear Interpolation as shown in the Figure 8.14. Use
“gfd” command to generate
the Flat Field data and use the
“sfc” command to apply the Flat Field Correction. At this time, the Flat Field data
is stored on the RAM, a volatile memory. In order to reuse the stored data, use
“sdf” command to store them on
the FLASH, a non-volatile memory.
1. It is recommended that you enable the
Defective Pixel Correction
feature before activating
the Flat Field Generator.
2. Activating the Flat Field Generator will set the camera
’s resolution to its full resolution.
3. To acquire an image, operate the camera with free-run mode or apply a trigger signal.
4. When the generation of the Flat Field data is completed, the previous settings for the camera
will be restored.
Summary of Contents for vieworks LVC-25MC2-30
Page 1: ......
