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underwater_videography_with_gopro [2025/05/07 22:42] – update attenuation coefficient to 0.05 which matches literature a bit better and regen intensity table; fix wildly incorrect figures for sensor size comparison qlyoungunderwater_videography_with_gopro [2025/07/27 16:35] (current) – qlyoung
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 For air *k* is around 0.0001. For seawater *k* is more like 0.05. That gives us roughly the following: For air *k* is around 0.0001. For seawater *k* is more like 0.05. That gives us roughly the following:
  
-| Depth (m) | Light Intensity (%) | +| Depth (m) | Depth (ft) | Light Intensity (%) | 
-|------------|---------------------| +|------------|------------|---------------------| 
-| 0          | 100.00%             | +| 0          | 0          | 100%                | 
-| 5          | 77.88%              | +| 5          | 15         | 78%                 | 
-| 10         | 60.65%              | +| 10         | 35         | 61%                 | 
-| 15         | 47.24%              | +| 15         | 50         | 47%                 | 
-| 20         | 36.79%              | +| 20         | 65         | 37%                 | 
-| 25         | 28.65%              | +| 25         | 80         | 29%                 | 
-| 30         | 22.31%              | +| 30         | 100        | 22%                 | 
-| 35         | 17.38%              | +| 35         | 115        | 17%                 | 
-| 40         | 13.53%              | +| 40         | 130        | 14%                 | 
-| 45         | 10.54%              | +| 45         | 150        | 11%                 | 
-| 50         | 8.21%               |+| 50         | 165        | 8%                  | 
  
  
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 Without this adjustment stabilization will still work, just not as well. GoPro Labs docs say that without it, Hypersmooth is about 70% effective compared to shooting in air. Without this adjustment stabilization will still work, just not as well. GoPro Labs docs say that without it, Hypersmooth is about 70% effective compared to shooting in air.
 +
 +To get an idea for the difference, compare the results of distortion correction calibrated for air (left) versus water (right):
 +
 +{{:air.png?400 |}} {{:water.png?400 |}}
 +
  
 ### GoPro specifics ### GoPro specifics
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 - It is performed on the camera CPU in real time and thus has hard compute limits to contend with - It is performed on the camera CPU in real time and thus has hard compute limits to contend with
 - It does not know what will happen in the future and cannot benefit from the additional information; stabilization in post can view the entire gyro track and perform smoothing over a larger time window, improving results - It does not know what will happen in the future and cannot benefit from the additional information; stabilization in post can view the entire gyro track and perform smoothing over a larger time window, improving results
 +- As mentioned above, distortion correction is not calibrated for water reducing stabilization quality
  
 For these reasons I do not use Hypersmooth when shooting underwater. For these reasons I do not use Hypersmooth when shooting underwater.
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 - A binary track containing gopro-specific metadata. This is where gyro, GPS and other metadata is stored. - A binary track containing gopro-specific metadata. This is where gyro, GPS and other metadata is stored.
  
-By default, GyroFlow will drop the metadata tracks when producing a stabilized output. This metadata is valuable and other tools such as Telemetry Overlay rely on it to function, so you want to keep this track.+By default, GyroFlow will drop the metadata tracks when producing a stabilized output. This metadata is valuable and other tools such as Telemetr 
 +y  
 +Overlay rely on it to function, so you want to keep this track.
  
 ## Denoising ## Denoising
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