cutcutcodec.core.filter.video.equation.FilterVideoEquation
- class cutcutcodec.core.filter.video.equation.FilterVideoEquation(in_streams: Iterable[StreamVideo], *colors: Basic | Real | str)[source]
Apply any equation on each pixels.
The relation is only between the pixel at the same timestamp at the same position.
Attributes
- colorslist[sympy.core.expr.Expr]
The luminosity expression of the differents channels (readonly).
Examples
>>> from cutcutcodec.core.filter.video.equation import FilterVideoEquation >>> from cutcutcodec.core.generation.video.noise import GeneratorVideoNoise >>> (stream_in,) = GeneratorVideoNoise(0).out_streams >>> (stream_out,) = FilterVideoEquation([stream_in], "b0", "(b0+g0+r0)/3", "0").out_streams >>> stream_in.snapshot(0, (2, 2)) FrameVideo(0, [[[127, 101, 236], [ 38, 57, 254]], [[184, 95, 125], [235, 3, 208]]]) >>> stream_out.snapshot(0, (2, 2)) FrameVideo(0, [[[127, 155, 0], [ 38, 116, 0]], [[184, 135, 0], [235, 148, 0]]]) >>>
Initialise and create the class.
Parameters
- in_streamstyping.Iterable[Stream]
Transmitted to
cutcutcodec.core.classes.filter.Filter.- *colorsstr or sympy.Basic
The brightness of the color channels. The channels are interpreted like is describe in
cutcutcodec.core.classes.frame_video.FrameVideo. The return values will be cliped to stay in the range [0, 1]. The value is 0 for min brightness and 1 for the max. If the expression gives a complex, the module is taken. The variables that can be used in these functions are the following:- iThe relative position along the vertical axis (numpy convention).
This value evolves between -1 and 1.
- jThe relative position along the horizontal axis (numpy convention).
This value evolves between -1 and 1.
t : The time in seconds since the beginning of the video.
- bi: The blue channel of the stream index i, i starts from 0 included.
This value evolves between 0 (dark) and 1 (light).
- gi: The green channel of the stream index i, i starts from 0 included.
This value evolves between 0 (dark) and 1 (light).
- ri: The red channel of the stream index i, i starts from 0 included.
This value evolves between 0 (dark) and 1 (light).
- ai: The alpha channel of the stream index i, i starts from 0 included.
This value evolves between 0 (transparent) and 1 (blind).