Baumer VLXT - Page 164

164
V2.6 | 8/30/2022 | 1120758
Correction Algorithm (Pixel Correction)
On Baumer cameras the problem of defect pixels is solved as follows:
▪ Possible defect pixels are identied during the production process of the camera.
▪ The coordinates of these pixels are stored in the factory settings of the camera.
▪ Once the sensor readout is completed, correction takes place:
▪ Before any other processing, the values of the neighboring pixels on the left and the
right side of the defect pixels, will be read out. (within the same bayer phase for
color)
▪ Then the average value of these 2 pixels is determined to correct the rst defect
pixel
▪ Finally, the value of the second defect pixel is is corrected by using the previously
corrected pixel and the pixel of the other side of the defect pixel.
Examples for the correction of defect pixels
71299
98
8
712
98
8
Step 3
7
7121087
Acutal state
Step 1
Correction
Step 2
7121087 6
5
712998
712810
7121087 6
Acutal state
Step 1
Correction
Step 2
712998 8
7128 810
Acutal state
Step 1
Correction
13
13
712998
98
8
68
18 15
7128
98
8
68
18 15
Step 3
7
7128 8
68
18 15
7
7
Acutal state
Step 1
Correction
Step 2
7128 8
18 15
7 7
11
712998
98
8
7128
98
87
7128 87 6
Acutal state
Step 1
Correction
Step 2
5
5
1399
98
13
99 5
5
5
99
98
5
Example 1
Example 1
Example 1
Example 2
Example 2
1 defect pixel
2 defect pixel
3 defect pixel
General Information (Defect Pixel List)
As stated previously, this list is determined during the camera's production and stored in
the factory settings.
Additional hot or cold pixels can develop during the lifecycle of a camera. If this happens,
Baumer gives you the option to add their coordinates to the defect pixel list.
You can determine the coordinates
*)
of the affected pixels and add them to the list. Once
the defect pixel list is stored in a user set, pixel correction is carried out for all coordinates
on the defect pixel list.
Notice
There are defect pixels, which occur only under certain environmental parameters.
These include temperatures or exposure settings.
Complete defect pixels that occur in your application.
*) Position in relation to full frame format (raw data format)
defect pixel
corrected pixel (red)
corrected pixel (green)