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Old 5th June 2014, 21:55   #1  |  Link
cretindesalpes
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CRT emulation with scanline and phosphor effects

Download: crt_display v1.0

This function emulates a CRT display using aperture grille (Trinitron) or Cromaclear technologies. It is slow but gives interesting results. Could be nice to chain after a NTSC defect emulator like dotcrawlplus. It implements various features like:
  • Works at any (non-integer) upscaling factor
  • Various ways of adjusting the scanline thickness and beam shape
  • Low-pass filtering of the input signal
  • Specific gamma target
  • Beam glow
  • Optional colored phosphor effect and shadow mask
  • Colors shift caused by beam misalignment
  • Automatic contrast adjustment
  • Halation
  • Very large upscale is possible, showing the grid of phosphors.

Requirements: Dither 1.26.0 or above and its dependencies, Avisynth 2.6, RGB colorspace.

Detailed instructions in the .avsi file. Prototype:
Code:
Function crt_display (clip src, float sw, float sh, float "voff", float "ppp",
\	float "cutoff", float "scandist", float "sharpv", float "sharph",
\	float "blurh", float "glowgain", float "glowh", float "glowv",
\	float "glowsens", float "contrast", float "gamma", float "softclip",
\	float "mix", float "beamshape", bool "phosphor", bool "pgrid",
\	float "vcs", float "cromaclear", float "maskpp", float "gainb",
\	float "halgain", float "halrange", string "pixel_type")

Examples of real NTSC footage with aperture grille (left) and Cromaclear shadow mask (right):

Code:
ar = 10.0 / 11.0
crt_display (2*ar, 2, ppp=1*ar, blurh=2.0) # Left
crt_display (2.5*ar, 2.5, ppp=1.25*ar, maskpp=1.25, cromaclear=1.0, voff=0.25) # right
Make sure to check the pictures at their original size.
Note that the scanline density (480) makes difficult to reproduce the Cromaclear effect in a limited resolution and exhibits unwanted pattern effects. We would need at least three lines per scanline to give it a better look.

But it works very well for upscaling 240p content, especially old-school videogame captures:

Sources, point-resized:

I don’t know at which gamma these pictures should be viewed so I kept them untouched like if they were in standard sRGB.

Cromaclear display type:

Code:
ar = 8.0 / 7.0
crt_display (5*ar, 5, ppp=2.5*ar, blurh=1.0, maskpp=2.5, cromaclear=1, scandist=1.5, cutoff=0.9, glowgain=0.125, halgain=0.03)
Aperture grille display type:

Code:
crt_display (5*ar, 5, ppp=2.5*ar, blurh=0.75, scandist=1, cutoff=0.9, glowgain=0.125, halgain=0.03)
The scanline effect and variable-width beam could have been more pronounced just by adding sharpv=2, beamshape=2.

Simple scanlines without phosphor effect:

Code:
crt_display (5*ar, 5, ppp=2.5*ar, blurh=1.0, maskpp=2.5, phosphor=false, scandist=3, cutoff=0.8, glowgain=1.0, glowh=6, glowv=0, halgain=0.03, sharpv=2)
This is just insane but gives an idea about how it could look with extreme settings.

More screenshots here. Default settings are generally OK, but tweaking the parameters can improve the results a lot.

My 15 kHz CRT is gone for a long time and I only have half-decent monitor photos for reference, so any advice based on real CRTs is welcome to improve the emulation.
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Last edited by cretindesalpes; 7th September 2018 at 17:04. Reason: Fixed the gallery url
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Old 5th June 2014, 23:41   #2  |  Link
Motenai Yoda
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It's look very like my old Sony Triniton!!!

But Triniton have also a defect, there were some horizontal gray lines.

http://www.dansdata.com/sg400.htm
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Last edited by Motenai Yoda; 5th June 2014 at 23:44.
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Old 6th June 2014, 00:07   #3  |  Link
TheSkiller
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Impressive!
Being a CRT expert and lover I definitely have to say this is the most authentic CRT simulation I've seen. Goes very nice especially with old games. I'll have some fun with this, even though I have plenty real CRTs right here.


Edit: One thing I noticed is the scanlines in your simulation are more pronounced with the Cromaclear setting compared to the Trinitron setting. Well, in my experience, and I have a Trinitron as well as a shadow mask CRT side by side here, the scanlines are generally more pronounced with Trinitrion masks and slightly less with shadow masks. This is also commonly known among retro gamer "CRT fetishists" on the internet. Trinitrons have slightly more pronounced scanlines compared to shadow masks.

Last edited by TheSkiller; 6th June 2014 at 00:18.
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Old 6th June 2014, 00:24   #4  |  Link
cretindesalpes
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TheSkiller:

Thanks. I agree with the Cromaclear/Trinitron mismatch. I just put different settings to show the versatility of the function, of course itís possible to increase the scanline effect with the Trinitron.

Motenai Yoda:

Indeed, I havenít included the ďdamping wireĒ effect. Iím not sure if itís a wanted featureÖ
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Old 6th June 2014, 03:52   #5  |  Link
Reel.Deel
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This is nice, it reminds me of much simpler times.
Kudos cretindesalpes.
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Old 6th June 2014, 04:29   #6  |  Link
Lyris
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Outstanding attention to detail. That really puts the crummy "Old TV effect" in NLEs to shame.
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Old 6th June 2014, 07:17   #7  |  Link
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Here's another thread about CRT simulation.

Btw. I get this error (crt_display.avsi is in the plugins folder)... any idea what could be the cause? I have this version and the plugins.
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Old 6th June 2014, 08:33   #8  |  Link
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Quote:
Originally Posted by creaothceann View Post
I get this error (crt_display.avsi is in the plugins folder)... any idea what could be the cause? I have this version and the plugins.
You need an updated MaskTools fully compatible with 2.6a4 - see here.
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Old 6th June 2014, 17:55   #9  |  Link
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Mmmh...
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Old 6th June 2014, 21:14   #10  |  Link
Motenai Yoda
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Quote:
Originally Posted by creaothceann View Post
U must delete old mt dlls
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Old 17th June 2014, 13:21   #11  |  Link
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This is so awesome...

It would be sweet if someone could turn these particular effects into shaders (or provide SweetFX/etc. settings that can emulate them)
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Old 22nd September 2014, 13:48   #12  |  Link
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To the author of this script/OP of the thread, I know I asked this via e-mail, but is there any way to help with the speed for rendering a video with this? Rendering to an MP4 file on my machine takes sometimes upwards of a day for a five minute recording.
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Old 22nd September 2014, 22:03   #13  |  Link
cretindesalpes
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Yes I saw your email but the previous week was quite intense for me IRL and I hadn’t the time to reply. Anyway I’m not sure about what is slow in the script, and if it can be optimized. I’ll try to benchmark it and narrow down the slowest parts in the next days but I cannot guarantee that I can come with significant speed improvement.

EDIT: I just found that vertical resizing/convolution in Dither_resize16 was not multi-threaded… Got a 75 % speed-up just by fixing it. More later.
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Last edited by cretindesalpes; 23rd September 2014 at 12:47.
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Old 23rd September 2014, 18:53   #14  |  Link
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As stated in my previous edited post, updating Dither to v1.26.5 will give a significant speed boost to crt_display. You can also maximize the CPU usage and double again the fps throughput by splitting the source video into 2 or 3 parts and encode them simultaneously.

These are probably the only large speed improvement left without altering the quality and accuracy of the emulation. I think implementing a native Dither_lut16 implementation (instead of a wrapper function around several mt_lutxy calls) could help a little too, as the function is heavily used.

Next, there’s a great amount of finetuning to do (like cutting the number of taps to the strict minimum for the gaussian blurs, or reducing the vertical oversampling of the beam), but this is a lot of work for little results.
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Old 4th October 2014, 18:50   #15  |  Link
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Thanks greatly for the reply. As I'm using AVISynth 2.6, what would you suggest further to improve? I've updated the dither plugins as suggested, and you've mentioned something about multi-threading. If it helps, here are my specs as well:

CPU: Intel Core i7-920 @2.8GHZ overclock
RAM: Corsair XMS3 DDR3-10666
GPU: PNY GeForce GTS-450
Motherboard: Gigabyte X58A-UD3Rv1
PSU: Corsair TX750
HDD: 3x500GB Seagate Barracuda 7200rpm
Capture Card 1: Startech PEXHDCAP (for anything above composite or s-video)
Capture Card 2: Pinnacle Dazzle DVC-101

[Edit] Here's an error that shows up all too often for me. I wonder what I'm doing wrong?
Attached Images
 

Last edited by NightSprinter; 5th October 2014 at 01:15. Reason: Add error screenshot
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Old 7th October 2014, 00:32   #16  |  Link
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Quote:
Originally Posted by NightSprinter View Post
[Edit] Here's an error that shows up all too often for me. I wonder what I'm doing wrong?
Use this version of Masktools, which should help speed a bit as well.
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Old 9th October 2014, 03:39   #17  |  Link
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That seemed to work, though I guess even 6GB of memory may not even be enough to render the 240p deinterlaced image up to 1280x960 in VirtualDub. I had to use AVIDemux and its AVSProxy companion to render the video I had set up in my script.
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Old 9th October 2014, 08:58   #18  |  Link
cretindesalpes
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With a regular Avisynth 2.6 version (32-bit single-threaded) you shouldn’t need such a huge RAM amount. Playing back a 224p to 1080p conversion in VirtualDub uses only 700 MB here. What is your script?
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Old 9th October 2014, 12:59   #19  |  Link
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My script looks like this (as I'm using the MT version of AVISynth, and did some deinterlacing of footage captured with a Dazzle at 640x480i)

Code:
SetMemoryMax(512)
SetMTMode(3)
SetMTMode(2)
Import("crt_display.avsi")
AviSource("converttorgb.avi")
SeparateFields(AssumeTFF)
#PointResize(640,480)
#Scanlines(STRENGTH=0)
ar = 1.0 / 1.0 
crt_display (2*ar, 4, ppp=2.5*ar, blurh=1.0, maskpp=2.5, cromaclear=1, scandist=1.5, cutoff=0.9, glowgain=0.125, halgain=0.03)
The render takes an entire night's worth of time via the AVIDemux program setup I have in order to render the final MP4 video.
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Old 27th April 2015, 02:34   #20  |  Link
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Anyone got any idea what would cause this?

I'd really like to try this script on some DOSBox captures

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