SubLCD-3:
twice as many pixels on LCD screens and similar.

It doubles the horizontal resolution, while avoiding colour fringing, and patents. Nice for 3D headsets, because real 3D effects depend on sharpness.

Twice as sharp pictures on LCD screens are possible with this method, which is very simple, visually good, and not patented.

If seriously interested, you may contact me:
kim.oyhus@gmail.com

Index

Source code.
How does it work?
What about the Cleartype patent?
SubLCD is different from Cleartype

Examples

Normal SubLCD-3
GIF GIF
Note how thin and fine the lines are here!

Normal
JPG GIF JPG

SubLCD-3
JPG GIF JPG

Normal SubLCD-3
JPG JPG

Source code?

Here it is:
SubLCD-3.c

Use it like this:
./SubLCD-3 < input_file_in_binary_raw.ppm > halved_output_file.ppm

It can be compiled like this:
gcc -o SubLCD-3 SubLCD-3.c -lm -O3

The license is Gnu Public License version 3. The copyright is mine.
So, if you want to use SubLCD-3 commercially, you should make a deal with me.
If you want to use it in freedom software, you can, because of GPL v3.

How does it work?

The picture goes through SubLCD-1 first, which shrinks it to half the size, but double the resolution. This results in colour fringing at some thin vertical lines. With a model of the eye, SubLCD-3 estimates these colour artifacts, and removes them

1.

To demonstrate this process,
I start with this test picture:		 GIF

2.

After being processed by SubLCD-1,
this is the result, with colour fringes:		 GIF

3.

The colour fringes are
then modeled,
giving this:		 GIF

4.

Correcting for them
gives the final result:		 GIF

What about the Cleartype patent?

Not a real problem, because: As for my competence talking about this:
I made one of my patent applications myself: PCT/NO2005/000027.
It can be found at WIPO by searching for "Oyhus".

Prior art

SubLCD has prior art even if Cleartype does not, because SubLCD uses green and purple pixels, as did the prior art.

Obvious

Again, the prior art shows how obvious this was. And the fact that I independently invented something so like it, is yet another sign of its obviousness.

SubLCD will never be patented

I promise that.

SubLCD is different from Cleartype

And here we come to the part where patents are discussed.
Thanks to David Turner for rounding them up here.

The reasons SubLCD falls outside all the independent claims of all the patents are:

The effect of this green and red-blue pixel strategy of SubLCD is to decrease luminosity artifacts, in such as giving diagonal edge steps more equal luminosity, so they look better.

Here they are:

Changelog

2008-11-29
2 days of reading patents and claims. Gah!
Put the analysis of them here.

2007-11-20
I put it on the net.