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| Science Forum Index » Compression Forum » Loseless image compression method... |
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| Earl_Colby_Pottinger... |
 Posted: Mon Jun 29, 2009 5:27 am |
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It would help to know more about the nature of the images.
B/W, Gray-Scale, Colour?
Bit depth?
Size (useful to determine speed of convertion)?
I don't know enough to make suggestions, but I know the more info you
supply, the better the help you will get. |
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| Thomas Richter... |
| Posted: Tue Jun 30, 2009 1:52 am |
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Abhishek Vora wrote:
[quote:1c4863fb5d]On of our system require heavy usage of image upload and download.
Images are satellite images and are in TIFF format.
[/quote:1c4863fb5d]
TIFF is not a compression format, it is a container. Specifically, you
can have a JPEG wrapped in a TIFF, so that doesn't mean much. You likely
mean: TIFF uncompressed? Or TIFF with LZW compression?
[quote:1c4863fb5d]Recently I have been assigned a task to find best suitable lossless
image compression technique to compress these images.
[/quote:1c4863fb5d]
What are your demands? Only compression? Or scalable compression (i.e.
do you need to extract several scales of the image, and/or certain
qualities?)
What is the nature of the image? B/W, RGB, multispectral? What is the
expected bit-depth?
My recommendation list is as follows:
o) Damn quick and pretty easy, but non-scalable: JPEG-LS.
o) Not so quick, but damn flexible: JPEG 2000 (lossless).
For the latter, I afraid most open implementations are not well-suited
to compress large images (i.e. typically images must fit into the memory
to be compressible by these codecs), however, the compression format
allows for "compression on the go" for potentially infinitely sized
images (long strips), and commercial software can do that for you.
So long,
Thomas |
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