DePulse

Abstract
Author	hanamahanama
Version	2005/04/11
Download	depulse.zip DePulseC05061403.zip
Category	VHS Restoration
License	Open source
Discussion	Doom9 Forum

Description

DePulse is dropout remover, removes white/black noise horizontal streaking in analogue captures. Spatio-Temporal.

DePulseC is sister product of DePulse. Just applying the same algorithm to the color difference. Reduces color pulse noise. Integrate with DePulse.

Dropouts mainly present themselves as a horizontal line sometimes teardrop shaped, usually bright that pops on screen for one or two frames that can be staggered in intensity.

Requirements

• [x86]: AviSynth+ or AviSynth 2.5.8 or greater
• Supported color formats: YUY2

Syntax and Parameters

DePulse

DePulse (clip, int "h", int "l", int "d", bool "debug")

clip   =

Input clip must be YUY2. Assumes TFF (top field first) field order interlacing.

int  h = 180

Pixel brightness values greater than h (high) are targeted as white noise.

If a pixel (t) is target'ed as white noise then surrounding pixels (above, below, before and after [temporal], Not left and right) are tested and if ALL of them are less than (t - d) the target pixel t is depulsed.

Range: 0-255

int  l = 60

Pixel brightness values less than l (low) are targeted as black noise.

If a pixel (t) is target'ed as black noise then surrounding pixels (above, below, before and after [temporal], Not left and right) are tested and if ALL of them are greater than (t + d) the target pixel t is depulsed.

Range: 0-255

int  d = 30

If the brightness is different from the pixels in the front and back (upper and lower) fields for d or more, it is determined as noise. (Common for white and black noise).

Range: 0-255

bool  debug = false

If debug=true, pixels judged to be black or white noise are coloured pink or green.

DePulseC

DePulseC (clip, int "h", int "l", int "d", bool "debug")

clip   =

Input clip must be YUY2. Assumes TFF (top field first) field order interlacing.

int  h = 180

Color difference values greater than h (high) are targeted as color noise.

If a pixel (t) is target'ed as white noise then surrounding pixels (above, below, before and after [temporal], Not left and right) are tested and if ALL of them are less than (t - d) the target pixel t is depulsed.

Range: 0-255 (does not concern itself with the 128 chroma offset, so args 'h' and 'l' are range 0-255 (16-240))

int  l = 60

Color difference values less than l (low) are targeted as color noise.

If a pixel (t) is target'ed as black noise then surrounding pixels (above, below, before and after [temporal], Not left and right) are tested and if ALL of them are greater than (t + d) the target pixel t is depulsed.

Range: 0-255 (does not concern itself with the 128 chroma offset, so args 'h' and 'l' are range 0-255 (16-240))

int  d = 30

If the color difference between the pixels in the front and back (upper and lower) fields is more than d, it is determined as noise.

Range: 0-255

bool  debug = false

If debug=true, pixels judged to be color noise are coloured white or black.

Examples

DePulse with default settings:

AviSource("Blah.avi")
DePulse (h=180, l=60, d=30, debug=false)

DePulseC with default settings:

AviSource("Blah.avi")
DePulseC (h=180, l=60, d=30, debug=false)

• DePulseC Hint: First, adjust h to around h=50, l=200 and adjust d (about 20 to 50?).
  You may have some side effects. After that, gradually increase h and lower l to reduce side effects.

Archived Downloads

Version	Download	Mirror
v1.0	Depulse_25_dll_v1.0_20170803.zip	Depulse_25_dll_v1.0_20170803.zip
2005/04/11	depulse.zip DePulseC05061403.zip	depulse.zip DePulseC05061403.zip

• v1.0 by StainlessS. See discussion: https://forum.doom9.org/showthread.php?p=1814102#post1814102
  • Fixed pitch for before and after frames, pitch can change within clip (crop/interleave/splice).
  • Added string Prefix arg, when set non "" will set Int Global variable,

External Links

• Homepage (in Japanese)

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