BLIND-GAUSS-BLUR(1)

NAME
blind-gauss-blur - Apply Gaussian blur to a video

SYNOPSIS
blind-gauss-blur [-j jobs] [-s spread | -s 'auto'] [-achvy] sd-stream

DESCRIPTION
blind-gauss-blur reads a video from stdin and a mask video from sd-stream. The video is printed to stdout, with all pixels are blurred using Gaussian blur with a standard deviation calculated for each pixel individually. The standard deviation is calculated by multiplying the X, Y, or Z value with the alpha value of the corresponding pixel and frame in sd-stream. The X value is used when blurring the X channel, and analogously for Y and Z. If the standard deviation is 0, the pixel is not blurred.

If stdin is longer than sd-stream, the remainder of stdin is printed without any changes. If stdin is shorter than sd-stream, the remainder of sd-stream is ignored but may be partially read.

OPTIONS

-a  Used to optimise performance if it is known that the video is opaque, and to ensure that the output video is opaque.

-c  Blur the chroma only, not the luma.

-h  Blur horizontally only. Has no affect if -v is also specified.

-j jobs
    Process the video in parallel, using jobs processes.

-s spread
    Pixels with Manhattan distances exceeding spread shall not affect each other. If 'auto' is specified, this value is calculated from the standard deviation used to blir a pixel. If -s is not used, there will not be distance limit.

-v  Blur vertically only. Has no affect if -h is also specified.

-y  Use the Y value (multiplied by the alpha value) from sd-stream as the standard deviation all channels.

REQUIREMENTS
blind-compress requires enough free memory to load three full frames into memory. A frame requires 32 bytes per pixel it contains.

SEE ALSO
blind(7), blind-single-colour(1), blind-time-blur(1)

AUTHORS
Mattias Andrée <maandree@kth.se>