Bad pixels treatment

1
Bad pixels treatment

• Previous and existing tools
• Examples and problems

2
Classes MBlindPixelCalc MBlindPixelsCalc2
MBadPixels

• Recognize noisy-problematic pixels
• Broken (no content gain fluctuations)
• HARDWARE solution
• Bright stars
• How?
• Check pedestal rms
• independent from Msigmabar!
• What to do with them?
• Use them as if they were OK
• Exclude from the image
• Interpolate

Calc
Treat
3
Example 1
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Too few neighbor good pixels
Event after cleaning
Cleaning levels
MPehPhotCam
4
Example 1
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Too few neighbor good pixels
Event after cleaning
Cleaning levels
MPehPhotCam
5
Example 1
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Too few neighbor good pixels
Event after cleaning
Cleaning levels
MPedPhotCam
6
Example 1
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Too few neighbor good pixels
Event after cleaning
Cleaning levels
MPehPhotCam
7
Example 2
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Event after cleaning
Cleaning levels
MPehPhotCam
8
Example 2
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Event after cleaning
Cleaning levels
MPehPhotCam
9
Example 2
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Event after cleaning
Cleaning levels
MPehPhotCam
10
Example 2
Calibrated Event
MBadPixelsCam
Event after interpolation
Pixels set as blind from check of pedestal rms
Pixels not calibrated
Event after cleaning
Cleaning levels
MPehPhotCam
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Anomalies
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Anomalies
13
Summary

• Tools are available, tested but not optimized
• Some problems cannot be solved simply with the
  check of the pedestal rms
• In Munich we Interpolate

for the old classes MBlindPixelsCalc2
blind blind.SetCheckPedestalRms() blind.SetUseIn
terpolation()
with the new classes MBadPixelsCalc
badpxcalc MBadPixelsTreat badpxtreat MBadPixel
sMerge badpxmerge