> Just thought I'd ask here to see what you guys might think about storing
> this kind of data within Valentina. I am writing a program that downloads
> temperature images from the net and then stores the images in a BLOB field.
> Now, I need to also parse the image and get the color value of all the
> pixels - (1037x477) - so about 495,000 pixels. I need to be able to compare
> this data to another images data - so I can find the rate of temperature
> change between the images.
Getting the change between 2 images is easy; just subtract one from the
other.
> Would it be wise to store the color data in a list and then put that into a
> varChar field? I need somehow to store the color values of each image so
> that they don't need to be processed each time a comparison is made...
I get the feeling that to analyse this data you need to do some reasonable
stats in order for it to be meaningful - for example, assessing rate of
change of temperature is dependent on your sample rate, and is thus subject
to aliasing. How you store all this data is more of a problem - you could
perhaps maintain a "moving average" image and compare new samples to it to
try and save you storing everything. This may not be useful as any
temperature image already represents the sum of heating and cooling that
have taken place.
It might help if you told us what the sample rates and precision are likely
to be, and perhaps the subject?
Marcus
--
Marcus Bointon
Synchromedia Limited: Putting you in the picture
marcus At synchromedia .D.O.T co.uk | http://www.synchromedia.co.uk
©2001 Marcus Bointon |
