Debilinear

Abstract
Author	Prunedtree
Version	r6
Download	debilinear r6.zip
Category	Resize
License	Closed source
Discussion

Description

This filter is designed to reverse the effects of bilinear upsampling. Parameters and sampling pattern try to mimic AviSynth's BilinearResize. Debilinear is only effective on "ideal" or close to ideal conditions. The conditions are that the material has to be a pure bilinear upscale, and you have to know exactly what was the original resolution and the possible sub-pixel shifts. Any other material overlayed on top of the upscale (like native 1080i/1080p credits) will cause ringing or visual defects. Same with compression artefacts, which will be amplified to death, so debilinear is clearly not suited for TV streams or any other low quality sources.

Note: Descale is recommended as a modern replacement for Debilinear.

Requirements

• [x86]: AviSynth+ or AviSynth 2.5.8 or greater
• Supported color formats: RGB24, RGB32, YV12

• SSE2 capable CPU

Limitations

• Sampling at 1:1 resolution is known to be unstable.
• This filter is not made for upsampling.

Syntax and Parameters

debilinear (clip, int target_width, int target_height, float "src_left", float "src_top", float "src_width", float "src_height", bool "lsb_inout")

debilinearY (clip, int target_width, int target_height, float "src_left", float "src_top", float "src_width", float "src_height", bool "lsb_inout")

clip   =

Input clip.

int  target_width =

int  target_height =

presumed 'native' resolution.

float  src_left = 0

float  src_top = 0

float  src_width =

float  src_height =

Optional crop rectangle in the input frame.

bool  lsb_inout = false

16-bit input and output; uses DitherTools' Stack16 format.

• debilinearY ignores chroma planes.

Changelog

Version      Date            Changes

r6           07/26/2012      + more optimizations (~50% speedup)
                             - fixed 16-bit rounding bug

r5           07/20/2012      + some small optimizations (~35% speedup)
                             - fixed UV shift glitch

r4           07/16/2012      - fixed RGB highdepth bug
                             - fixed border glitch

r3           07/01/2012      - memory leak fixed

r2           07/01/2012      + some SSE code (~4x speedup)
                             - fixed little glitch in 16-bit mode
                             + full YV12 support

r1           06/30/2012      + changed sampling patterns (mimics bilinearResize)
                             + YV12 luma support
                             + 16-bit (dithertools format) support

Archived Downloads

Version	Download	Mirror
r6	debilinear r6.zip

External Links

• Doom9 Forum - Using Debilinear with Canon EOS cameras.
• Doom9 Forum - Debilinear444 discussion.
• MediaFire - DebilinearM.avsi - a function to mask native 1080p content when using Debilinear.

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