TCannyMod

Revision as of 12:36, 3 April 2016

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.

• NOTE: TCannyMod requires appropriate memory alignments. Thus, if you want to crop the left side of your source clip before this filter, you have to set Crop(align=true).

Requirements

• AviSynth 2.6.0 or greater
• x64 version requires AviSynth+ r1576 or greater
• Supported color formats: Y8, YV12, YV16, YV24, YV411

• SSE2 capable CPU
• Microsoft Visual C++ 2015 Redistributable Package (x86 / x64)

*** vcredist_x86.exe required for TCannyMod-x86

*** vcredist_x64.exe required for TCannyMod-x64

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", float "gmmax", int "opt")

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 31, 63, 127 and 255.

31 = horizontal

63 = 45' up

127 = vertical

255 = 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.
• 4 : fill with 0.

float  gmmax = 255.0

Used for scaling gradient magnitude into [0,255] for mode=1.

gmmax is internally set to 1.0 if you set it to < 1.0.

opt  int = -1

Specify which CPU optimization are used (default = auto).

• 0 - forth SSE2 + SSE routine.
• 1 - forth SSE4.1 + SSE2 + SSE routine.

Others - use AVX2 + FMA3 + AVX routine.

GBlur

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

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

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.
• 4 : fill with 0.

opt  int = -1

Specify which CPU optimization are used (default = auto).

• 0 - forth SSE2 + SSE routine.
• 1 - forth SSE4.1 + SSE2 + SSE routine.

Others - use AVX2 + FMA3 + AVX routine.

EMask

Generate gradient magnitude edge map. Just an alias for TCannyMod(mode=1).

EMask (clip, float "sigma", float "gmmax", int "chroma", bool "sobel", int "opt")

clip   =

Input clip; only planar formats are supported.

float  sigma = 1.5

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

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

float  gmmax = 50.0

Used for scaling gradient magnitude into [0,255] for mode=1.

gmmax is internally set to 1.0 if you set it to < 1.0.

int  chroma = 1

Chroma processing:

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

bool  sobel = false

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

opt  int = -1

Specify which CPU optimization are used (default = auto).

• 0 - forth SSE2 + SSE routine.
• 1 - forth SSE4.1 + SSE2 + SSE routine.

Others - use AVX2 + FMA3 + AVX routine.

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, gmmax=255.0, opt=-1)

GBlur with default settings:

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

EMask with default settings:

AviSource("blah.avi")
EMask (sigma=1.5, gmmax=50.0, chroma=0, sobel=false, opt=-1)

Changelog

Version      Date            Changes

V1.1.1       04/03/2016      - Add AVX2 support for 32bit.

v1.1.0       03/28/2016      - Add EMask().
                             - Implement simd non-maximum-suppression.
                             - a bit optimized gaussian-blur/ hysteresis.

v1.0.0       03/26/2016      - Almost rewrite.
                             - VS2013 to VS2015.
                             - Add AVX2(64bit only) / SSE4.1(both 32bit and 64bit) support.
                             - Change direction values from 1,3,7,15 to 31,63,127,255.
                             - Reduce waste processes.

v0.2.0       09/13/2015      - add option "gmmax"
                             - update avisynth.h
                             - VS2010 to VS2013 and code cosmetics

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

External Links

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

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