Kdenlive/Manual/Clip Menu/Stabilize/ru: Difference between revisions
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Эта функция применяет для клипа, алгоритм стабилизации изображения, который может уменьшить дрожание кадра, обусловленное нестабильным положением камеры (например съёмка с рук и т.п.) | Эта функция применяет для клипа, алгоритм стабилизации изображения, который может уменьшить дрожание кадра, обусловленное нестабильным положением камеры (например съёмка с рук и т.п.) | ||
There are two different methods of stabilization available in '''Kdenlive''' - vstab and transcode. | |||
This video shows a side by side comparison between vstab and transcode stabilize methods. | |||
{{#ev:youtube|86SUhodScDE}} | |||
=== stabilize ( vstab) === | === stabilize ( vstab) === | ||
This is based on [http://vstab.sourceforge.net/ this] work. | |||
В этом учебнике показано, как использовать функцию стабилизации - vstab версии: | В этом учебнике показано, как использовать функцию стабилизации - vstab версии: | ||
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Based on the tooltips from this screen and the docs [http://public.hronopik.de/vid.stab/features.php?lang=en here] this what all the options mean: | Based on the tooltips from this screen and the docs [http://public.hronopik.de/vid.stab/features.php?lang=en here] this what all the options mean: | ||
'''optzoom''' = use optimal zoom (calculated from transforms). Causes video to zoom until 90% of transformations are hidden. default - checked. | '''optzoom''' = use optimal zoom (calculated from transforms). Causes video to zoom until 90% of transformations are hidden. default - 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 | '''accuracy''' = accuracy of shakiness detection. Should be >=shakiness factor. 1: low (fast processing) 15: high (slow processing) - default 4. Recommended 8 | ||
'''algo''' (= algorithm used) | '''algo''' (= algorithm used) checked= small measurement fields - default = checked. Unchecked means use brute force algorithm. The brute force algorithm is deprecated. | ||
'''maxangle''' = maximum angle to rotate - in radians. default = -1 which means no limit | '''maxangle''' = maximum angle to rotate - in radians. default = -1 which means no limit | ||
'''relative''' unchecked = absolute transform, checked = relative transform. Default is checked. | '''relative''' unchecked = absolute transform (don't use this), checked = relative transform. Default is checked. | ||
'''zoom''' - Additional zoom during transform. Percentage to zoom > 0 = zoom in, <0 = zoom out. The zoom specified here is additional to the optimum zoom calculated by the program when optzoom is checked. default = 0 | '''zoom''' - Additional zoom during transform. Percentage to zoom > 0 = zoom in, <0 = zoom out. The zoom specified here is additional 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 | '''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 | '''invert''' - invert the transform. default = unchecked. Inverting the transform is pointless - leave unchecked. | ||
'''sharpen''' - sharpen transformed image. amount of sharpening: 0: no sharpening. uses filter unsharp with 5x5 matrix Default = 0.8 | '''sharpen''' - sharpen transformed image. amount of sharpening: 0: no sharpening. uses filter unsharp with 5x5 matrix Default = 0.8 | ||
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'''stepsize''' - step size of search process, region around minimum is scanned with 1 pixel resolution- default = 6 | '''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 | '''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. | ||
'''mincontrast''' below this contrast - the field is discarded. Range 0-1 default =0.3 | '''mincontrast''' below this contrast - the field is discarded. Range 0-1 default =0.3. You may want to used a smaller value for a really low contrast clip. | ||
'''smoothing''' | '''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. | |||
Eg 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) | |||
'''maxshift''' maximal number of pixels to translate image. (default = -1 no limit) | '''maxshift''' maximal number of pixels to translate image. (default = -1 no limit) | ||
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'''crop''' unchecked = The border of the transformed frames contains the pixels from previous frames. Checked = black background. default = unchecked | '''crop''' unchecked = 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 | |||
{{#ev:youtube|HYE3KAl8RAQ}} | |||
Deshaked | |||
{{#ev:youtube|c3CEm8bgVQ0}} | |||
{{#ev:youtube| | Original | ||
{{#ev:youtube|cRA5H1LYzM4}} | |||
Revision as of 19:33, 9 January 2013
Стабилизация
Этот пункт меню доступен из контекстного меню клипа, находящегося в дереве проекта или в меню Проект, когда клип выделен в дереве проекта.
Эта функция применяет для клипа, алгоритм стабилизации изображения, который может уменьшить дрожание кадра, обусловленное нестабильным положением камеры (например съёмка с рук и т.п.)
There are two different methods of stabilization available in Kdenlive - vstab and transcode.
This video shows a side by side comparison between vstab and transcode stabilize methods.
stabilize ( vstab)
This is based on this work.
В этом учебнике показано, как использовать функцию стабилизации - vstab версии:
Настройки "shutter angle" - расказчик говорит что не знает что это такое (1:35) ... Shutter angle - это угол съёмки - максимальный угол на который может быть повернуто изображение, подлежащее стабилизации. См. здесь.
stabilize (transcode)
Based on the tooltips from this screen and the docs here this what all the options mean:
optzoom = use optimal zoom (calculated from transforms). Causes video to zoom until 90% of transformations are hidden. default - 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.
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.
zoom - Additional zoom during transform. Percentage to zoom > 0 = zoom in, <0 = zoom out. The zoom specified here is additional 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.
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.
mincontrast below this contrast - the field is discarded. Range 0-1 default =0.3. You may want to used 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.
Eg 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 = 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