Kdenlive/Руководство/меню Проект/Стабилизация
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.)
stabilize ( vstab)
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.
accuracy = accuracy of shakiness detection. Should be >=shakiness factor. 1: low (fast processing) 15: high (slow processing) - default 4
algo (= algorithm used) unchecked =brute force. checked= small measurement fields - default = checked
maxangle = maximum angle to rotate - in radians. default = -1 which means no limit
relative unchecked = absolute transform, 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
invert - invert the transform. default = 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
mincontrast below this contrast - the field is discarded. Range 0-1 default =0.3
smoothing = number of frames for lowpass filtering. Used to calculate number of frames to be used for lowpass filtering used for stabilizing. Number of frames = smoothing * 2 + 1. default =10. A larger smoothing means that we transform away more camera movements. The resulting clip has a lower change in camera speed. Demo of the difference here
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
This video shows a side by side comparison between vstab and transcode stabilize methods.