This is NOT a QNX specific question. It has to do with JPEG graphic images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8 byte
serial number. The serial number should NOT be visible. But if it does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any kind
then all bets are off.
You must have got a contract form Al-Qaeda Bill
This is one of ways bad guys use to communicate over internet. Yes what you
want is possible, although I don’t know any details.
This is NOT a QNX specific question. It has to do with JPEG graphic
images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8
byte
serial number. The serial number should NOT be visible. But if it does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and
extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any kind
then all bets are off.
You must have got a contract form Al-Qaeda Bill >
This is one of ways bad guys use to communicate over internet. Yes what you
want is possible, although I don’t know any details.
It’s called “steganography” or “watermarking” (I guess depending on how much
information you want to transfer).
I’ve thought about doing this for watermarking purposes.
How much budget do you have for this Bill?
Lossy encodings like JPEG could be problematic; non-lossy like GIF should
be dead simple to use the LSB of one of the colours.
What do you mean by “inconspicuous”? That’s just too vague; one suggestion
would be do alter the start colour of each line in some way that JPEG
encoding won’t alter it (significantly).
This is NOT a QNX specific question. It has to do with JPEG graphic
images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8
byte
serial number. The serial number should NOT be visible. But if it does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and
extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any kind
then all bets are off.
\
–
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Books, Video-based and Instructor-led
Training and Consulting at www.parse.com.
Email my initials at parse dot com.
Well, I don’t know what photo editing programs are out there for QNX but this a
relatively simple task using Adobe Photoshop or Paint Shop Pro in Windows. You
might see what photo programs are out there for Qnx or Linux and that should do
the trick for you.
good luck
Shawn
“Bill Caroselli (Q-TPS)” wrote:
Hi all
This is NOT a QNX specific question. It has to do with JPEG graphic images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8 byte
serial number. The serial number should NOT be visible. But if it does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any kind
then all bets are off.
It’s called “steganography” or “watermarking” (I guess depending on how much
information you want to transfer).
There is a much simpler way than this. JPEG supports an additional data block known
as EXIF. My digital camera stores all the camera settings for a photo using an EXIF
information block. It should be VERY easy to extend a normal JPEG to include such
a data block as it does not require hiding/obfuscating any information in the image
data itself. I imagine a google search for JPEG and EXIF should provide the details
you need.
Robert Krten <> nospam83@parse.com> > wrote:
It’s called “steganography” or “watermarking” (I guess depending on how much
information you want to transfer).
There is a much simpler way than this. JPEG supports an additional data block known
as EXIF. My digital camera stores all the camera settings for a photo using an EXIF
information block. It should be VERY easy to extend a normal JPEG to include such
a data block as it does not require hiding/obfuscating any information in the image
data itself. I imagine a google search for JPEG and EXIF should provide the details
you need.
Yes, but the question then becomes, does he want the end-user to be able to “easily”
modify the watermark or not? Or even easily read the watermark?
Cheers,
-RK
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Books, Video-based and Instructor-led
Training and Consulting at www.parse.com.
Email my initials at parse dot com.
You must have got a contract form Al-Qaeda Bill >
This is one of ways bad guys use to communicate over internet. Yes what
you
want is possible, although I don’t know any details.
This is NOT a QNX specific question. It has to do with JPEG graphic
images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8
byte
serial number. The serial number should NOT be visible. But if it does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and
extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any kind
then all bets are off.
camz@passageway.com > wrote:
Robert Krten <> nospam83@parse.com> > wrote:
It’s called “steganography” or “watermarking” (I guess depending on how
much
information you want to transfer).
There is a much simpler way than this. JPEG supports an additional data
block known
as EXIF. My digital camera stores all the camera settings for a photo
using an EXIF
information block. It should be VERY easy to extend a normal JPEG to
include such
a data block as it does not require hiding/obfuscating any information
in the image
data itself. I imagine a google search for JPEG and EXIF should provide
the details
you need.
Yes, but the question then becomes, does he want the end-user to be able
to “easily”
modify the watermark or not? Or even easily read the watermark?
And some programs will remove this extra data when saving the file.
Cheers,
-RK
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Books, Video-based and Instructor-led
Training and Consulting at > www.parse.com> .
Email my initials at parse dot com.
Igor Kovalenko <> Igor.Kovalenko@motorola.com> > wrote:
You must have got a contract form Al-Qaeda Bill >
This is one of ways bad guys use to communicate over internet. Yes what
you
want is possible, although I don’t know any details.
It’s called “steganography” or “watermarking” (I guess depending on how
much
information you want to transfer).
I’ve thought about doing this for watermarking purposes.
How much budget do you have for this Bill? >
Lossy encodings like JPEG could be problematic; non-lossy like GIF should
be dead simple to use the LSB of one of the colours.
What do you mean by “inconspicuous”? That’s just too vague; one
suggestion
would be do alter the start colour of each line in some way that JPEG
encoding won’t alter it (significantly).
This is NOT a QNX specific question. It has to do with JPEG graphic
images
which I know very little about.
What we’d like to do is encode information into a JPEG file, like an 8
byte
serial number. The serial number should NOT be visible. But if it
does
alter the image in an inconspicuous way, that’s OK.
We’d like to be able to look at that picture later down the road and
extract
that serial number from it. Is this possible?
I realize that if the image is piped through an image editor of any
kind
then all bets are off.
\
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Books, Video-based and Instructor-led
Training and Consulting at > www.parse.com> .
Email my initials at parse dot com.
Robert Krten <> nospam83@parse.com> > wrote:
It’s called “steganography” or “watermarking” (I guess depending on how
much
information you want to transfer).
There is a much simpler way than this. JPEG supports an additional data
block known
as EXIF. My digital camera stores all the camera settings for a photo
using an EXIF
information block. It should be VERY easy to extend a normal JPEG to
include such
a data block as it does not require hiding/obfuscating any information in
the image
data itself. I imagine a google search for JPEG and EXIF should provide
the details
you need.
