TCannyMod

Abstract
Author	Chikuzen
Version	v0.1.1
Download	tcannymod-0.1.1.zip
Category	Edge Detection
License	GPLv2
Discussion	Doom9 Thread

Description

TCannyMod is a Canny edge detection filter. It's based on tcanny written by Kevin Stone (a.k.a. tritical) but rewritten from scratch exclusively for AviSynth 2.6.

Requirements

• AviSynth 2.6.0 or greater
• Supported color formats: Y8, YV12, YV16, YV24, YV411

• SSE2 capable CPU
• Microsoft Visual C++ 2010 SP1 Redistributable Package (x86)

Syntax and Parameters

TCannyMod

Builds an edge map using Canny edge detection.

TCannyMod (clip, int "mode", float "sigma", float "t_h", float "t_l", bool "sobel", int "chroma")

clip   =

Input clip; only planar formats are supported.

int  mode = 0

Sets the output format:

• 0 : thresholded edge map (255 for edge, 0 for non-edge)
• 1 : gradient magnitude map.
• 2 : edge pixel only gradient direction map (non-edge pixels set to 0)
• 3 : gradient direction map

Gradient direction are normalized to 1, 3, 7 and 15.

1 = horizontal

3 = 45' up

7 = vertical

15 = 45' down

• 4 : Gaussian blurred frame.

float  sigma = 1.5

Standard deviation of Gaussian blur. 0 means no blurring before edge detection.

(0 <= sigma <= 2.83, default = 1.5)

float  t_h = 8.0

float  t_l = 1.0

High and low gradient magnitude threshold for hysteresis; t_h must be greater than t_l.

bool  sobel = false

If set to true, edge detection will use a Sobel operator instead of [1, 0, -1].

int  chroma = 0

Chroma processing:

• 0 : do not process
• 1 : process
• 2 : copy from input clip.
• 3 : fill with 0x80(128), output is grayscale.

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GBlur

Gaussian blur filter. Just an alias for TCannyMod(mode=4).

GBlur (clip, float "sigma", int "chroma")

clip   =

Input clip; only planar formats are supported.

float  sigma = 0.5

Standard deviation of Gaussian blur. 0 means no blurring before edge detection.

(0 <= sigma <= 2.83, default = 0.5)

int  chroma = 1

Chroma processing:

• 0 : do not process
• 1 : process
• 2 : copy from input clip.
• 3 : fill with 0x80(128), output is grayscale.

Examples

TCannyMod with default settings:

AviSource("blah.avi")
TCannyMod (mode=0, sigma=1.5, t_h=8.0, t_l=1.0, sobel=false, chroma=0)

GBlur with default settings:

AviSource("blah.avi")
GBlur (sigma=0.5, chroma=1)

Changelog

Version      Date            Changes

v0.1.1       08/21/2013      - fix crash when sigma is too large
                             - add new argument 'sobel'
                             - add new function 'GBlur'

v0.1.0       08/017/2013     - Initial release

Archived Downloads

Version	Download	Source code	Mirror
v0.1.1	tcannymod-0.1.1.zip	TCannyMod-master.zip

External Links

• GitHub - Source code repository.
• Doom9 Forum - TCannyMod discussion.

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