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2021-02-25T07:50:44Z

‎External Links

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#REDIRECT [[External_filters#Sharpeners]]
{{FilterCat|External_filters|Adjustment_filters|Sharpeners}}

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 <br>
 == External Links ==
-*[https://web.archive.org/web/20171116052500/http://forum.gleitz.info/showthread.php?33105-Neues-Plugin-zum-Video-sch%E4rfen-Patent-Problem!&p=321585#post321585 Gleitz Forum] - AVSShock discussion in German.
+*[https://web.archive.org/web/20171116052500/http://forum.gleitz.info/showthread.php?33105-Neues-Plugin-zum-Video-sch%E4rfen-Patent-Problem!&p=321585#post321585 Gleitz Forum] - AVSShock discussion in German (original forum archived) / [https://gleitz.info/forum/index.php?thread/33105-neues-plugin-zum-video-sch%C3%A4rfen-patent-problem/ forum after update].
 <br>
 <br>
 -----------------------------------------------
 '''Back to [[External_filters#Sharpeners|External Filters]] &larr;'''

← Older revision		Revision as of 07:42, 25 February 2021
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−	~~#REDIRECT~~ [[~~External_filters#~~Sharpeners]]	+	{{FilterCat\|External_filters\|Plugins\|Restoration_filters\|Sharpeners}}
−	{{~~FilterCat~~\|~~External_filters~~\|~~Adjustment_filters~~\|~~Sharpeners~~}}	+	{{Filter3
		+	\|1=AMSS0815
		+	\|2=2008-02-23
		+	\|3=[https://web.archive.org/web/20160905074720if_/http://forum.gleitz.info/attachment.php?attachmentid=91901&d=1203778580 AVSShock-2008.02.23.zip]
		+	\|4=[[:Category:Sharpeners\|Sharpeners]]
		+	\|5=[https://www.gnu.org/licenses/gpl-2.0.txt GPLv2]
		+	\|6=[http://forum.doom9.org/showthread.php?t=122443 Doom9 Thread]}}
		+	<br>
		+	== Description ==
		+	This Shock Filter sharpens edges of images by applying erosions or dilations depending on the sign of the Laplacian (or the so called Haralick-Canny edge detector).
		+
		+	Common sharpening algorithms often evolve the heat equation backwards (so called Gabor algorithm). This is done by convoluting the image with a mask with negative weights (like AviSynths build-in Sharpen function does). As this method violates a so called maximum principle (values of pixels calculated may be outside the value range of the original image), instabilities arise after some iterations, which can be observed as high oscillations.
		+
		+	This filter uses a morphological approach: In each iterations step, pixels are replaced by one of their neighbors. To avoid sharpening noise, a blurred version of the image is used only for the choice of each neighbor. This way high oscillations can be avoided even on large scales.
		+	<br>
		+	<br>
		+	<span style="color:red">'''Note:'''</span> AVSShock is a C-plugin so it must be loaded using [[Plugins#LoadCPlugin\|LoadCPlugin]], except if you're using AviSynth+, it allows autoloading of C-plugins.
		+	<br>
		+	<br>
		+	== Requirements ==
		+	* [x86]: [[AviSynth+]] or [https://sourceforge.net/projects/avisynth2/ AviSynth 2.6]
		+	* Supported color formats: [[YUY2]], [[YV12]]
		+	<br>
		+
		+	== [[Script variables\|Syntax and Parameters]] ==
		+	:{{Template:FuncDef\|Shock(clip Clip, int "Steps", float "Strength", bool "Canny", float "Blur", int "BlurSize")}}
		+	<br>
		+	::{{Par2\|\|clip\| }}
		+	:::Clip gives the source clip. YV12 or YUY2 are the only colorspaces currently allowed. The resulting clip will have the same properties as the source clip.
		+	<br>
		+	::{{Par2\|Steps\|int\|1}}
		+	:::Unsharp masking threshold.
		+	:::Steps gives the number of iterations applied to each video frame. (Default: 1). If Steps is zero, the clip is returned unmodified. Use a negative number to display a copyright message (along with an error message).
		+	<br>
		+	::{{Par2\|Strength\|float\|1.0}}
		+	:::Strength gives the size of each iterations step. Values between 0.0 and 1.0 are allowed (Default: 1.0). The effective scale of the shock filter will be Steps∗Strength. If this product is zero, the source clip will be returned unchanged.
		+	<br>
		+	::{{Par2\|Canny\|bool\|false}}
		+	:::Canny: If true, the Haralick-Canny edge-detector will be used, which is more precisely and requires more computation time. Otherwise, the Laplacian will be used. (Default: False).
		+	<br>
		+	::{{Par2\|Blur\|float\|1.0}}
		+	:::Blur defines how strong each frame will be blurred before the edge detector is applied. Note that the blurred image will not be processed further. After applying the edge-detector, the erosions and dilations are applied to the original frame. The Blur value is the standard deviation of a Gaussian convolution kernel which is applied to the frame for blurring. (Default: 1.0). If Blur is zero, the blurring step is completely omitted and computation will be considerably faster.
		+	<br>
		+	::{{Par2\|BlurSize\|int\|}}
		+	:::BlurSize is the size of the blurring kernel: The kernel used will be a (2∗BlurSize+1)×(2∗BlurSize+1) matrix. (Default: Ceil(2∗Blur)). If BlurSize is zero, the blurring step is completely ommited and computation will be considerably faster.
		+	<br>
		+
		+	== Examples ==
		+	AVSShock with default settings:
		+	[[AviSource]]("Blah.avi")
		+	Shock()
		+	<br>
		+
		+	== Changelog ==
		+	<pre>
		+	2006.12.19
		+
		+	Initial Version.
		+
		+	2007.01.04
		+
		+	Changed the Blur default from 2.0 to 1.0.
		+	Changed the BlurSize default from Round(2∗Blur+1) to Ceil(2∗Blur).
		+	Added this helpfile
		+	Maybe memory consumption reduced: Source frame is released before second temporary frame is allocated. I don't know how AviSynth exactly handles frame allocation stuff.
		+	About 25% speed up: Temporary memory was allocated by creating frames, now malloc is used.
		+	Some minor code improvement. Numbering of pixels inside a 3×3 block is more elegant. Maybe undetectable speed up.
		+
		+	2007.01.25
		+
		+	Small extensions in the help file.
		+	Small corrections in the help file html-layout.
		+	Small corrections/improvements in code: Added forgotten calling-convention macro to Shock_Free, moved color space dependent undefs in CS-file.
		+	Bug corrected: When an unknown color space was used (e.g. Y8), a "out of memory"-message came up.
		+	Raised gcc optimization level from -O1 to -O3 (silly me).
		+
		+	2007.02.19
		+
		+	Simplified distinction of standard deviation and heat equation scale in Code.
		+	GetFrame function rewritten. Size of binary reduced by 1 kB.
		+	Added filter name to error messages.
		+	Changed error handling in filter create function to avoid multiple memory allocation.
		+	Small corrections in help file.
		+	First public version.
		+
		+	2008.02.23
		+
		+	AviSynth_C.dll is not needed anymore (I updated MinGW (see the makefile) — thanks to Fizick).
		+	Changed a lot floats to doubles, which increased blurring accuracy and speed.
		+	Blur intensity is checked for too small values now.
		+	Minor change to CreateGaussKernel function.
		+
		+	</pre>
		+	<br>
		+	== Archived Downloads ==
		+	{\| class="wikitable" border="1"; width="600px"
		+	\|-
		+	!!width="100px"\| Version
		+	!!width="150px"\| Download
		+	!!width="150px"\| Mirror
		+	\|-
		+	!2008-02-23
		+	\|[https://web.archive.org/web/20160905074720if_/http://forum.gleitz.info/attachment.php?attachmentid=91901&d=1203778580 AVSShock-2008.02.23.zip]
		+	\|
		+	\|-
		+	!2007-02-19
		+	\|[https://web.archive.org/web/20160905074728if_/http://forum.gleitz.info/attachment.php?attachmentid=85900&d=1171916753 AVSShock-2007.02.19.zip]
		+	\|
		+	\|}
		+	<br>
		+	== External Links ==
		+	*[https://web.archive.org/web/20171116052500/http://forum.gleitz.info/showthread.php?33105-Neues-Plugin-zum-Video-sch%E4rfen-Patent-Problem!&p=321585#post321585 Gleitz Forum] - AVSShock discussion in German.
		+	<br>
		+	<br>
		+	-----------------------------------------------
		+	'''Back to [[External_filters#Sharpeners\|External Filters]] ←'''

AVSShock - Revision history

Reel.Deal: /* External Links */

Reel.Deal: add documentation

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