|
|
|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [WM]: Need some image sets for testing
----- On Thursday, April 06, 2006 electrical engineers wrote: -----
[... stuff cut ...]
> I 'd like to ask you a question, when you bring some image database
> the unique question always is " talk about this database of
> images", what do you think they want me to tell them?
[... stuff cut ...]
When a database of images is used as test source material for a research project, it is important to know how many images are in the
database, their resolution, color representation, and color depth, how they were digitized (digital photos or scanned), what
processing has been done, are they compressed (if so, how). There are probably a host of other important issues. Someone should
put together a FAQ.
The goal of using a large number of images rather than a single image is to predict how an approach would work in "the real world"
with real images. It is important to understand to what extent the database of test images represents the distribution of real
images. This is context and application dependent. For example, the images in the database you've pointed out wouldn't be
appropriate for a watermarking technique targeting x-ray imagery or ultrasound imagery or animation, etc. The images are all
compressed, so it might not be representative for an application that adds authentication marks during the acquisition process. By
fully describing the images in the database, researchers can select the appropriate database for their context.
- Jeffrey
-----------------------------------------------------
Jeffrey A Bloom, Content Security Research Group Thomson Corporate Research, Princeton, NJ, USA
(609) 987-7727, (609) 987-7299 fax
______________________________________________________________________________
Watermarking Mailing List - http://www.watermarkingworld.org/ml.html
To unsubscribe send email to "majordomo@watermarkingworld.org" with
"unsubscribe watermarking YOURMAIL" in the body.
______________________________________________________________________________
|
