NEW BACKGROUND SUBTRACTION METHOD

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Presentation transcript:

NEW BACKGROUND SUBTRACTION METHOD Problem: How to subtract stars and the Milky Way from All-Sky Images

NEW BACKGROUND SUBTRACTION METHOD CONT. Stars can be filtered out using a median filter or similar kernel based algorithms Large saturated areas are not handled well by these methods The Milky Way can not be removed by these kernel filters Simultaneous off-band images are usually not available

NEW BACKGROUND SUBTRACTION METHOD CONT. New procedure constructs an appropriate background image by remapping the off-band image to the desired time Build up a data base of background images free of clouds and sunrise/sunset effects

NEW BACKGROUND SUBTRACTION METHOD CONT.

NEW BACKGROUND SUBTRACTION METHOD CONT.

NEW BACKGROUND SUBTRACTION METHOD CONT. 6300A image from El Leoncito

NEW BACKGROUND SUBTRACTION METHOD CONT. Off-band (6444A) image

NEW BACKGROUND SUBTRACTION METHOD CONT. Difference of two off-band images taken ~10 minutes apart

NEW BACKGROUND SUBTRACTION METHOD CONT. Difference of 6300A image and time shifted (600 sec.) background image

NEW BACKGROUND SUBTRACTION METHOD CONT. Median smoothed to reduce stars residuals

NEW BACKGROUND SUBTRACTION METHOD CONT.