Thursday, 6 July 2017

post processing - How can one correct intensity flicker due to AC line frequency?


Is there a good image processing method to get rid of the horizontal stripes in the images taken under fluorescent lighting? These stripes (flicker) occur when you take pictures indoors due to the 50 Hz (Europe) or 60 Hz (US) AC line frequency, and they reflect in the image as twice of this frequency (either 100 Hz or 120 Hz). One commonly suggested way is to choose a synchronized shutter speed (exposure time) such as 1/50s (1/60s) but how would you go about it, if the pictures are taken at an arbitrary shutter speed and you want to fix it in the post-processing?


Here is an example picture that displays the phenomenon:


Horizontal stripes (flicker)




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