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2021-08-17-1st
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dbuscombe-usgs committed Aug 18, 2021
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Expand Up @@ -53,14 +53,15 @@ see the png images the program makes inside the same directory as the input imag

## How does this work?


Let's take this image, which is a tile cropped out of a larger orthomosaic - see [here](https://coastal.er.usgs.gov/data-release/doi-P9L474WC/):
![][example/20180619_MadeiraBeachFL_ortho_5cm_10_12.jpg]
![](example/20180619_MadeiraBeachFL_ortho_5cm_10_12.jpg)

The filter with default radius of 3 pixels creates this PBR image
![][example/20180619_MadeiraBeachFL_ortho_5cm_10_12_filt.png]
![](example/20180619_MadeiraBeachFL_ortho_5cm_10_12_filt.png)

In the figure below, the process is broken into stages
![][example/20180619_MadeiraBeachFL_ortho_5cm_10_12_filt_fig_breakdown.png]
![](example/20180619_MadeiraBeachFL_ortho_5cm_10_12_filt_fig_breakdown.png)

a) original image
b) wavelet denoised image, where noise over a range of scales is removed and mostly affects very small scale (pixel level) noise. This step isnt crucial but I always like to denoise imagery if I can as a precaution
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