Contam is also fun!

Today I happened to find out that NIST has developed some software and they are free. So I downloaded one of them, Contam 2.4, followed the tutorials and finished my first ever Contam project. It's fun, though I am not sure how accurate the results could be.

Here's the link for the software:
http://www.bfrl.nist.gov/IAQanalysis/index.htm

And this is my results:

Generate an input data array to train the neural network

A simple loop-in-loop program.


%matlab code 
clc; clear all; close all;
A=[0.1, 0.2, 0.3, 0.1, 0.1, 0.2]; % assumed initial value
B=[0.5, 0.1, 0.1, 0, 0.2, 0.1];
C=[0, 0.2, 0.2, 0.4, 0.1, 0.1]; 
final=[];
r=1;
for i= 0:10
    for j=0:10
         for k=1:10
sum_up=(i*A+j*B+k*C);
                total=sum(sum_up);
                result=sum_up/total;
                row=[i, j, k, result];
final(r,:)=row;
                r=r+1;
    end
    end
end

Download Matlab toolbox manual - Fuzzy logic toolbox

I would like to share a good book to show you how to use Fuzzy Logic Toolbox in Matlab. You can download it from:

http://www.box.net/shared/xe94kj9ej1

Enjoy!

How to import JPG/JPEG image into AutoCAD 2009?

It's very hard to find the right button on the menu (or navigation panel ?)of AutoCAD 2009. So just type the command:

IMAGEATTACH

That's it!

A GREAT way to reduce the .TIF file size while keep same high quality

Use Microsoft Office Picture Manager to open the original .TIF file, then export, set export size to 100%, DONE!

I had a >70MB .TIF image with 10000*10000 pixel, after applying this method, the image was shrinked to ~3MB. It's still 10000*10000 pixel and the quality is still good. That's amazing!

Use Sigmaplot to export high quality .TIF/.TIFF file

Sigmaplot is a powerful tool for drawing scientific charts, and it is also powerful at exporting high quality .TIF/.TIFF file, which can be directly submitted to the journal editors. Here's what I found out how to get high quality images from Sigmaplot:

Firstly, scale down the original graph. The default size of charts are relatively big, usually ~100mm*100mm. It's better to scale them down to 30%. Then select the items, and use highest DPI possible (for me, 600DPI). And change the exporting size to about 3 -5 time larger than the chart size. This will give you a large and clear TIF image.

AutoCAD TIF output quality Experiments

Since I don't really understand the relationship between DPI, PPI, image size, color mode, and the image quality, I decided to test them out by myself. Although it took me a whole nigh last night, I thought it is worth doing. Now I do know how to get a .TIF image with good quality (no blurry edges of letters and lines) and appropriate image size (several thousand pixels in each dimension, and the file size is about several tens MB).

Here's some tricks what I found out:

1. Scale down the drawing in AutoCAD. This won't decrease the image quality. Actually this can help decrease the file size of the output .TIF file. I used same settings for two prints, one is 10 times scaled up of the other one. And the two files are ~2MB and ~70MB respectively.

2. Use smaller print size in AutoCAD. At first I though I should print a very large size, maybe A2 or A1, to get a good image. Actually this has nothing to do with the image quality. When this size is large, the final .TIF image will be very large. I got a 10,000*10,000 pixel .TIF and my computer got stuck!

3. Usually 600dpi or 720dpi will be good enough.

4. Use 24Bit color. Other color mode doesn't work as well as 24Bit color.