VsTCanny

Revision as of 03:05, 10 March 2022

Description

Builds an edge map using canny edge detection.

vsTCanny is a port of the VapourSynth plugin TCanny.

Requirements

• [x86]: AviSynth+ or AviSynth 2.6
• [x64]: AviSynth+
• Supported color formats: Y8, YV12, YV16, YV24, YV411
  • AviSynth+: all planar formats (8/10/12/14/16/32-bit, Y, YUV(A), and RGB(A) with or without alpha) are supported.

Syntax and Parameters

vsTCanny (clip, float "sigmaY", float "sigmaU", float "sigmaV", float sigma_vY", float "sigma_vU", float "sigma_vV", float "t_h", float "t_l", int "mode", int "op", float "scale", int "y", int "u", int "v", int "opt")

clip   =

A clip to process. All planar formats are supported.

float  sigmaY = 1.5

float  sigmaU =

float  sigmaV =

Standard deviation of horizontal gaussian blur.

Must be positive value.

Setting to 0 disables gaussian blur.

Default:

sigmaY = 1.5

sigmaU = sigmaY / horizontal_chroma_subsampling_factor

sigmaV = sigmaU

float  sigma_vY = sigmaY

float  sigma_vU =

float  sigma_vV =

Standard deviation of vertical gaussian blur.

Must be positive value.

Setting to 0 disables gaussian blur.

Default:

sigma_vY = sigmaY

if sigma_vY not defined: if horizontal and vertical subsampling factors are equal sigma_vU = sigmaU else sigma_vU = sigmaU * horizontal_chroma_subsampling_factor

if sigma_vY defined: sigma_vU = sigma_vY / vertical_chroma_subsampling_factor

sigma_vV = sigma_vU

float  t_h = 8.0

High gradient magnitude threshold for hysteresis.

float  t_l = 1.0

Low gradient magnitude threshold for hysteresis.

Must be lower than t_h.

int  mode = 0

Sets the output format:

• -1 : Gaussian blur only.
• 0 : Thresholded edge map (2^bitdepth-1 for edge, 0 for non-edge).
• 1 : Gradient magnitude map.

int  op = 1

Sets the operator for edge detection:

• 0 : The operator used in tritical's original filter.
• 1 : The operator proposed by P. Zhou et al.
• 2 : The Sobel operator.
• 3 : The Scharr operator.
• 4 : The Kroon operator.
• 5 : The Kirsch operator.
• 6 : he FDoG operator.

float  scale = 1.0

Multiplies the gradient.

This can be used to increase or decrease the intensity of edges in the output.

Must be greater than 0.0.

int  y = 3

int  u = 3

int  v = 3

Planes to process.

• 1 : Return garbage.
• 2 : Copy plane.
• 3 : Process plane. Always process planes when the clip is RGB.

int  opt = -1

Sets which cpu optimizations to use.

• -1 : Auto-detect.
• 0 : Use C++ code.
• 1 : Use SSE2 code.
• 2 : Use AVX2 code.
• 3 : Use AVX512 code.

Examples

vsTCanny with default settings (for YUV420):

AviSource("blah.avi")
vsTCanny(sigmaY=1.50, sigmaU=0.75, sigmaV=0.75, sigma_vY=1.50, sigma_vU=0.75, sigma_vV=0.75, \
          t_h=8.0, t_l=1.0, mode=0, op=1, scale=1.0, Y=3, U=3, V=3, opt=-1)

vsTCanny with default settings (for YUV444):

AviSource("blah.avi")
vsTCanny(sigmaY=1.50, sigmaU=1.50, sigmaV=1.50, sigma_vY=1.50, sigma_vU=1.50, sigma_vV=1.50, \
          t_h=8.0, t_l=1.0, mode=0, op=1, scale=1.0, Y=3, U=3, V=3, opt=-1)

Changelog

Version      Date            Changes

v1.1.7       2022/03/10      - Changed the behavior of default sigma_vU.

v1.1.6       2022/03/07      - Fixed default sigma_U/V/vU/vV for RGB formats.
                             - Changed default sigma_vU/vV. Now they are inherited from sigmaU/V.

v1.1.5       2022/01/25      - Fixed the processing of planes for RGB formats.
                             - Properly clamped float mask to 0-1 range in mode=1. (VS plugin r14)

v1.1.4       2022/01/03      - Fixed the behavior when y/u/v=1

v1.1.3       2021/12/28      - Fixed the uninitialized variables when the clip has only one plane

v1.1.2       2021/12/28      - Fixed a bug when sigma=0 and the plane is not processed

v1.1.1       2021/12/26      - Fixed the processing of clips with one plane

v1.1.0       2021/12/17      - Changed chroma planes range from -0.5..0.5 to 0.0..1.0 (float clips). (VS plugin r13)
                             - Added AVX512 code. (VS plugin r13)
                             - Added Kroon, Kirsch and FDoG operatos. (VS plugin r13)
                             - Renamed gmmax parameter to scale and changed its default to 1.0. (VS plugin r13)
                             - Changed default sigma_vY from 1.5 to sigmaY

v1.0.1       2021/08/25      - Fixed sigma for RGB clips

v1.0.0       2020/09/15      - Initial release; port of the VapourSynth plugin

External Links

GitHub - Source code repository.

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