h a l f b a k e r yLike a magnifying lens, only with rocks.
add, search, annotate, link, view, overview, recent, by name, random
news, help, about, links, report a problem
browse anonymously,
or get an account
and write.
register,
|
|
|
There are many ways to do colour 2d barcodes, like
HCCB...
But how viable is it to merge 3 QR or Datamatrix codes
into
separate Red/Green/Blue colour channels?
The benefit of this, is you can use existing barcode
algorithms
(not easy rolling your own!). Plus you can embed 3x as
much
information on the same area.
Backward compatibility with black and white QR cameras
is
probably not possible. But the ease of programmer
implementations might help speed up adoption.
If combining the data from 3 channels into one file, then
combine in this sequence of
RedData+GreenData+BlueData. aka R/G/B .
Good mnemonic.
----
Edits:
There is two additional concept added based on this
discussion:
1. Tracking reference colours (BigSleep). To deal with
various
lighting conditions, perhaps add reference colours to the
to the tracking boxes of each QR. Need to adjust vision
algo perhaps, so its a bit more complex.
2. Mono Fallback (BigSleep): Embed a mono channel QR
by
adjusting luminosity per pixel. This allows for embedding
a mono channel QR code that can survive black and
white photocopy, and also is compatible with most QR
code readers. Needs more complex reader tho.
CYMK QR Code concept
http://briankhuu.co...CYMK_QR/CYMK_QR.png
Can't seem to blend RGB in inkscape D: ! But this is not too bad. [mofosyne, Dec 20 2014]
CYMK QR Code concept (with integrated reference colour)
http://briankhuu.co...CYMK_QR_compact.png
This one doesn't need reference colour bar, since it already has colour reference integrated in the tracking pixels. [mofosyne, Dec 20 2014]
8 colour level vs 4 colour level 2d HCCB barcode
http://spong.com/ne...-Just-Selling-_.jpg
HCCB is cool, except its owned by microsoft. And they tried pushing... microsoft tag.... (8 level is Cyan, Yellow, & Magenta) (4 level is Cyan & Yellow only) [mofosyne, Dec 20 2014]
.net paint layer filtering
http://briankhuu.co...QR/CYMK_QR_Test.pdn
Just activate and deactivate layers to expose each QR colour layers. [mofosyne, Dec 22 2014]
Mono Fallback Concept for CYMK QR
http://briankhuu.co...QR_monofallback.png
okay bigsleep, is this what you mean? [mofosyne, Dec 22 2014]
Real Character, could be done in CMYK if you really wanted to ...
http://en.wikipedia...Lord%27s_Prayer.jpg
[not_morrison_rm, Dec 23 2014]
Color barcodes - stanford
http://web.stanford...asins/research.html
[mofosyne, Dec 23 2014]
Color Classifiers for 2D Color Barcodes
https://fedcsis.org...s/2013/pliks/67.pdf
Marco Querini and Giuseppe F. Italiano University of Rome “Tor Vergata”, 00133 Rome, Italy [mofosyne, Aug 22 2015]
Reliability and Data Density in High Capacity Color Barcodes ?
http://www.doiserbi...20-02141400054Q.pdf
Marco Querini and Giuseppe F. Italiano [mofosyne, Aug 22 2015]
High Capacity Colored 2-Dimensional (HCC2D) Code
https://en.wikipedi...sional_(HCC2D)_Code
It's coming? [mofosyne, Aug 22 2015]
[link]
|
| |
Wonder when HCCB (High Capacity Colour Barcode) be as
free to use as QR... |
|
| |
Relatively simple for use with phones or similar readers.
Most dedicated readers tend to use monochromatic readers
(most commonly monochrome cameras). This would raise
the cost of your reader. |
|
| |
Also, this raises the risk of a misread. Unless your color
discrimination is perfect, you might get crosstalk. |
|
| |
Yea, hence I would think this is more for consumer purpose,
rather than industry. E.g. Encryption key distribution is
more realistic with higher density barcodes. |
|
| |
Industry specific barcodes would just stick to the lowest
common denominator barcode for speed, and reliability.
And plus they don't need to store much information on it
anyway. |
|
| |
The only way you could truly store 3x the data is if some of
the colored spots overlapped. Which then means you need
to be able to discriminate not just Red Green and Blue, but
the various combinations as well (since when they overlap
you get other colors). |
|
| |
Kind of like the test colour mark you see on cereal boxes?
(Used to check alignment, and colour quality) |
|
| |
Maybe set of coloured box of R/G/B and RG/GB/RB pixels
next to the QR code as a calibration mark for the
smartphone? So in any lighting condition, just check for the
(R/G/B/RG/GB/RB) mark and use it as a known reference
colour point. |
|
| |
Added a few [link] of a few CYMK QR mockups images. |
|
| |
Don't want to modify these "must be present pixels", they
are for tracking, so need them to be present in all layers.
So keeping reference pixel seperate... |
|
| |
Hmm... on second thought. Could work, if the
smartphone is smart enough. So added that example in as
well. |
|
| |
Anyhow, the examples uses CYMK, since I am not leet
enough with inkscape to do additive blending of RGB
layers. So am using CYMK colour blending scheme. This
might actually be a better idea, since that's what most
print shop actually prefer I'm sure. |
|
| |
Anyhow, now we got some concept CYMK QR codes. So if
anybody knows how to do visual processing, I'll be curious
if anybody is able to decode what I posted here. |
|
| |
Double bun if this works on printed paper from a
smartphone. ( Maybe you got some Cyan, Yellow or
Magenta colour filters lying around?) |
|
| |
since we are embedded C,Y,M layers, and these pixels
may merge in any combination. That means there is 2^3 =
8 colour levels you need to distinguish. (It's possible to do
so as well, since if you remember... HCCB also has 8 level
colour mode. They also have 4 level colour mode as well,
which judging by the colour scheme, is restricted to just
Cyan and Yellow ) |
|
| |
This is confirmed to be working at least via .net paint
colour filtering. To extract the Cyan layer, I used the
Yellow and Magenta filters (via 'mixing' blend option in
.net paint). |
|
| |
Give it a shot in .net paint, via the .pdn file attached in
[link] |
|
| |
Wasn't too sure what you mean bigsleep, so I made a
mockup in the [link] as "mono fallback". |
|
| |
It's scannable by my phone, however my biggest concern
would be the difficulty of decoding the colour information
embedded in it. Especially in an uncontrolled lighting
environment on paper via smartphone. How easy is it to
equalize luminosity anyway, and how much colour
information can be preserved? |
|
| |
But if anybody is able to make this work, and make it
popular. Then they will by my hero :D |
|
| |
Also another thought: This fallback is really great when
dealing with paper. Because even if it is scanned black
and white, not all information is lost. |
|
| |
So in the context of... say a business card. If people
photocopy the card, you want to at least keep the mono
channel active, and storing the most important details
like your phone number. The colour channel can store the
non critical but helpful data instead. |
|
| |
[-] Due to colour fading on posters/t-shirts, and different "warmth" settings on display devices, the information resolution would be unreliable. You might be able to use a pure red, green or blue, just not orange or purple or brown. |
|
| |
How do you explain the existence of HCCB bar-
codes
then? They use colour, and was used for the
smartphone app Microsoft Tag. |
|
| |
Plus this is not going to replace mono QR codes.
It's meant to be complimentary to it. So you'll see
this more often in computer screens or printed
paper. |
|
| |
On the issue of colour variations. One potential
approach is to provide a reference colour of RGB,
or CYM, colours in the barcode for calibration. |
|
| |
Get it over and done with, just use the Real Character.. |
|
| |
NB why was all this old stuff written by an Igor...I mean "trefpafs" |
|
| |
//just use the Real Character// Just use the ad itself: have recognition software look for the matching image in a generic web storehouse, and get the URL from that. No blotches, no codes, nuthin'. |
|
| |
[mofo] deboned, I initially read the post as suggesting there'd be a high bit depth. |
|
| |
Yea, which is why I really like bigsleep's idea of mono QR
fallback mode for the CYMK barcode. |
|
| |
Btw noticed a stanford research on this. Looks very
similar
to the CYMK QR concept, but they coloured the tracking
boxes with the 6 reference colours (excluding black and
white) levels. |
|
| |
So really, this all seems quite possible. But the real
question
is if mono fallback mode is practical |
|
| |
BigSleep :~ Credits for the tracking box and mono fallback
is corrected. |
|
| |
On observation, it does seem
that the change in luminosity might make the colour
harder to discern. |
|
| |