Kdenlive/Manual/Clip Menu/Stabilize/en: Difference between revisions
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====Stabilize==== | ====Stabilize==== | ||
This menu item is available from [[Special:MyLanguage/Kdenlive/Manual/Projects_and_Files/Project_Tree#Project Tree - Right Click Menu|right click]] on a clip in the | This menu item is available from [[Special:MyLanguage/Kdenlive/Manual/Projects_and_Files/Project_Tree#Project Tree - Right Click Menu|right-click]] on a clip in the Project Tree or under the [[Special:MyLanguage/Kdenlive/Manual/Project_Menu|Project menu]] when a clip is selected in the Project Tree. | ||
This feature applies image stabilization algorithms to the clip which can reduce the shakiness of a | This feature applies image stabilization algorithms to the clip which can reduce the shakiness of a bit of footage. | ||
In versions | In versions 0.9.8 and earlier of Kdenlive, there were two different methods of stabilization available: vstab and transcode. In version 0.9.10, the vstab method was removed leaving us with just the "transcode" method (based on [http://public.hronopik.de/vid.stab/ this] work). | ||
This video shows a side by side comparison between vstab and transcode stabilize methods. | This video shows a side by side comparison between vstab and transcode stabilize methods. | ||
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===== Stabilize ===== | ===== Stabilize ===== | ||
[[File:Kdenlive stabilise transcode.png|frame|left|Transcode Dialog in version 0.9.2]] | |||
This menu item was called ''stabilize (transcode)'' in versions 0.9.2 and earlier. | |||
<br clear=all> | <br clear=all> | ||
[[File:Kdenlive Stablise transcode v0.9.3.png|frame|left|Transcode Dialog in version 0.9.3 and higher]] | |||
[[File:Kdenlive | In version 0.9.3, the transcode GUI was simplified. | ||
<br clear=all> | <br clear=all> | ||
Based on the tooltips from this screen and the docs [http://public.hronopik.de/vid.stab/features.php?lang=en here], this is what all the options mean: | |||
''' | '''optzoom''' = use optimal zoom (calculated from transforms). Causes video to zoom until 90% of transformations are hidden. Default is checked. Hint: You can further zoom in with the zoom option. | ||
''' | '''accuracy''' = accuracy of shakiness detection. Should be >= shakiness factor. 1: low (fast processing). 15: high (slow processing). Default: 4. Recommended: 8. | ||
''' | '''algo''' = algorithm used. Checked = small measurement fields. Default = checked. Unchecked means use brute force algorithm. The brute force algorithm is deprecated and this option is not available after version 0.9.3. | ||
''' | '''maxangle''' = maximum angle to rotate in radians. Default = -1, which means no limit. | ||
''' | '''relative''' Unchecked = absolute transform (don't use this). Checked = relative transform. Default is checked. This option is not available in version 0.9.3 - it uses relative transform. | ||
''' | '''zoom''' - Additional zoom during transform. Percentage to zoom > 0 = zoom in, < 0 = zoom out. The zoom specified here is in addition to the optimum zoom calculated by the program when optzoom is checked. Default = 0. | ||
''' | '''shakiness''' How shaky is the video? And how quick is the camera? 1: little (fast processing). 10: very strong/quick (slow processing). Default = 4. Note: large values may also reduce the accuracy. This is due to the internals of the movement-detection. Typically you don't need a value greater than 7. | ||
''' | '''invert''' Invert the transform. Default = unchecked. Inverting the transform is pointless - leave unchecked. This option is not available in version 0.9.3. | ||
''' | '''sharpen''' Sharpen transformed image. Amount of sharpening: 0: no sharpening. Uses filter unsharp with 5x5 matrix. Default = 0.8. | ||
''' | '''stepsize''' Step size of search process. Region around minimum is scanned with 1 pixel resolution. Default = 6. | ||
''' | '''show''' 0 = draw nothing, 1 or 2 = show fields and transforms. Use 1 or 2 to preview what the process is going to do. [http://public.hronopik.de/vid.stab/files/skiing_veryshaky_visualized8_short.ogv example]. Default = 0. Non-zero values of this parameter are not relevant in the '''Kdenlive''' implementation - use zero. This option is not available in version 0.9.3. | ||
'''mincontrast''' Below this contrast, the field is discarded. Range 0-1. Default = 0.3. You may want to use a smaller value for a really low contrast clip. | |||
'''smoothing''' Controls the amount of smoothing/stabilization. The larger the value for smoothing, the more camera movements are compensated. The resulting clip has a lower change in camera speed. | |||
Technically it is the number of frames for lowpass filtering = (smoothing * 2) + 1. | |||
For example, with a with 25 fps clip, a value of 12 for the smoothing factor means we would smooth over one second - 12 frames behind the current frame + the current frame (1) + 12 frames after the current frame. Default =10. | |||
Demo of the difference [http://public.hronopik.de/vid.stab/files/skiing_veryshaky_short_vs_longsmoothing_above.ogv here] (top:3, bottom: 30) | Demo of the difference [http://public.hronopik.de/vid.stab/files/skiing_veryshaky_short_vs_longsmoothing_above.ogv here] (top:3, bottom: 30). | ||
'''maxshift''' | '''maxshift''' Maximal number of pixels to translate image. Default = -1. No limit. | ||
'''crop''' | '''crop''' Unchecked means the border of the transformed frames contains the pixels from previous frames. Checked = black background. Default = unchecked. | ||
Example of the effect of running stabilize - transcode from the original author - Georg Martius | Example of the effect of running stabilize - transcode from the original author - Georg Martius. | ||
Side by side | Side by side |
Revision as of 14:07, 24 January 2015
Stabilize
This menu item is available from right-click on a clip in the Project Tree or under the Project menu when a clip is selected in the Project Tree.
This feature applies image stabilization algorithms to the clip which can reduce the shakiness of a bit of footage.
In versions 0.9.8 and earlier of Kdenlive, there were two different methods of stabilization available: vstab and transcode. In version 0.9.10, the vstab method was removed leaving us with just the "transcode" method (based on this work).
This video shows a side by side comparison between vstab and transcode stabilize methods.
Stabilize
![](/images.userbase/8/85/Kdenlive_stabilise_transcode.png)
This menu item was called stabilize (transcode) in versions 0.9.2 and earlier.
![](/images.userbase/a/a0/Kdenlive_Stablise_transcode_v0.9.3.png)
In version 0.9.3, the transcode GUI was simplified.
Based on the tooltips from this screen and the docs here, this is what all the options mean:
optzoom = use optimal zoom (calculated from transforms). Causes video to zoom until 90% of transformations are hidden. Default is checked. Hint: You can further zoom in with the zoom option.
accuracy = accuracy of shakiness detection. Should be >= shakiness factor. 1: low (fast processing). 15: high (slow processing). Default: 4. Recommended: 8.
algo = algorithm used. Checked = small measurement fields. Default = checked. Unchecked means use brute force algorithm. The brute force algorithm is deprecated and this option is not available after version 0.9.3.
maxangle = maximum angle to rotate in radians. Default = -1, which means no limit.
relative Unchecked = absolute transform (don't use this). Checked = relative transform. Default is checked. This option is not available in version 0.9.3 - it uses relative transform.
zoom - Additional zoom during transform. Percentage to zoom > 0 = zoom in, < 0 = zoom out. The zoom specified here is in addition to the optimum zoom calculated by the program when optzoom is checked. Default = 0.
shakiness How shaky is the video? And how quick is the camera? 1: little (fast processing). 10: very strong/quick (slow processing). Default = 4. Note: large values may also reduce the accuracy. This is due to the internals of the movement-detection. Typically you don't need a value greater than 7.
invert Invert the transform. Default = unchecked. Inverting the transform is pointless - leave unchecked. This option is not available in version 0.9.3.
sharpen Sharpen transformed image. Amount of sharpening: 0: no sharpening. Uses filter unsharp with 5x5 matrix. Default = 0.8.
stepsize Step size of search process. Region around minimum is scanned with 1 pixel resolution. Default = 6.
show 0 = draw nothing, 1 or 2 = show fields and transforms. Use 1 or 2 to preview what the process is going to do. example. Default = 0. Non-zero values of this parameter are not relevant in the Kdenlive implementation - use zero. This option is not available in version 0.9.3.
mincontrast Below this contrast, the field is discarded. Range 0-1. Default = 0.3. You may want to use a smaller value for a really low contrast clip.
smoothing Controls the amount of smoothing/stabilization. The larger the value for smoothing, the more camera movements are compensated. The resulting clip has a lower change in camera speed. Technically it is the number of frames for lowpass filtering = (smoothing * 2) + 1. For example, with a with 25 fps clip, a value of 12 for the smoothing factor means we would smooth over one second - 12 frames behind the current frame + the current frame (1) + 12 frames after the current frame. Default =10.
Demo of the difference here (top:3, bottom: 30).
maxshift Maximal number of pixels to translate image. Default = -1. No limit.
crop Unchecked means the border of the transformed frames contains the pixels from previous frames. Checked = black background. Default = unchecked.
Example of the effect of running stabilize - transcode from the original author - Georg Martius.
Side by side
Deshaked
Original
stabilize (vstab) - ver <=0.9.8
This is based on this work and is not available in versions of kdenlive >= 0.9.10.
This tutorial shows how to use the stabilize feature - vstab version:
The "shutter angle" setting that the narrator says he does not know what it does (1:35) ... Shutter angle is an angle that images could be maximum rotated for stabilization. see here.