EEDI2

Revision as of 03:23, 2 June 2016

Description

EEDI2 (Enhanced Edge Directed Interpolation) resizes an image by 2x in the vertical direction by copying the existing image to 2*y(n) and interpolating the missing field. It is intended for edge-directed interpolation for deinterlacing (i.e. not really made for resizing a normal image, but can do that as well).

• EEDI2_092_ICL13.7z is an optimized version built with Intel C++ Compiler 13. See discussion.

Requirements

• AviSynth 2.5.8 or greater
• Supported color formats: YUY2, YV12

Syntax and Parameters

EEDI2 (clip, int "mthresh", int "lthresh", int "vthresh", int "estr", int "dstr", int "maxd", int "field", int "map", int "nt", int "pp")

clip   =

Input clip.

int  mthresh = 10

int  lthresh = 20

int  vthresh = 20

These all control edge detection used for building the initial edge map.

• mthresh is the edge magnitude threshold... its range is from 0 to 255, lower values will detect weaker edges.
• lthresh is the laplacian threshold... its range is 0 to 510, lower values will detect weaker lines.
• vthresh is the variance threshold... its range is 0 to a large number, lower values will detect weaker edges.

Use the "map" option to tweak these settings as needed.

int  estr = 2

int  dstr = 4

These are used for dilation and erosion of the edge map.

• estr sets the required number of edge pixels (<=) in a 3x3 area, in which the center pixel has been detected as an edge pixel, for the center pixel to be removed from the edge map.
• dstr sets the required number of edge pixels (>=) in a 3x3 area, in which the center pixel has not been detected as an edge pixel, for the center pixel to be added to the edge map.

Use the "map" option to tweak these settings as needed.

int  maxd = 24

Sets the maximum pixel search distance for determining the interpolation direction.

Larger values will be able to connect edges and lines of smaller slope but can lead to artifacts. Sometimes using a smaller maxd will give better results than a larger setting. The maximum possible value for maxd is 29.

int  field = -1

Controls which field in the resized image the original image will be copied too.

When using AviSynth's internal parity value top field first (tff) = 1 and bottom field first (bff) = 0. Possible options:

• -2 = alternates each frame, uses AviSynth's internal parity value to start
• -1 = uses AviSynth's internal parity value
• 0 = bottom field
• 1 = top field
• 2 = alternates each frame, starts with bottom
• 3 = alternates each frame, starts with top

int  map = 0

Allows one of three possible maps to be shown. Possible settings:

• 0 - no map
• 1 - edge map (edge pixels will be set to 255 and non-edge pixels will be set to 0.)
• 2 - original scale direction map
• 3 - 2x scale direction map

int  nt = 50

Defines a noise threshold between pixels in the sliding vectors, this is used to set initial starting values.

Lower values should reduce artifacts but sacrifice edge reconstruction... while higher values should improve edge reconstruction but lead to more artifacts. The possible range of values is 0 to 256.

int  pp = 1

Enables two optional post-processing modes aimed at reducing artifacts by identifying problems areas and then using plain vertical linear interpolation in those parts. The possible settings are:

• 0 - no post-processing
• 1 - check for spatial consistency of final interpolation directions
• 2 - check for junctions and corners
• 3 - do both 1 and 2

Using the pp modes will slow down processing and can cause some loss of edge directedness.

Examples

EEDI2 with default settings:

AviSource("blah.avi")
EEDI2(mthresh=10, lthresh=20, vthresh=20, estr=2, dstr=4, maxd=24, field=-1, map=0, nt=50, pp=1)

Changelog

   06/07/2006  v0.9.2

       + various internal changes to help reduce artifacts around repeated
         patterns and to improve construction of lines/edges with small slope
       - Changed map from bool to int
       - Changed default maxd value from 12 to 24
       - Changed default pp value from 0 to 1
       - a few minor bugfixes


   04/03/2006  v0.9.1

       + Added pp parameter and pp modes 1, 2, and 3
       - A few minor internal changes
       - Fixed some documentation errors (field parameter)
       - do a vi.SetFieldBased(false) in constructor
       - fixed a bug causing reads past the last line and incorrect interpolation
         of the very top or very bottom line in some cases


   11/29/2005  v0.9

       - Initial release

Archived Downloads

External Links

• Doom9 Forum - EEDI2 discussion.
• Doom9 Forum - EEDI2 0.9.2 built with ICL13.
• Doom9 Forum - EEDI2 for VapourSynth.
• GitHub - HandBrake's EEDI2 port with nicely commented source code: eedi2.c, eedi2.h

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