Thread Subject: Need help with Image Processing

Hi all,


I'm new to Matlab. Right now, I'm working on a project named " Face controlled Electronic wheel chair " and i m using Digital image processing Technique.

Since i'm new, i got stuck halfway.

What i did so far is, i wrote codes for capturing image from camera , then convert it to grayscale, removing salt and pepper noise and then converted it to binary image.


What i have to do next is , i need to compare this image with a set of images.

For example :

if testimg = img1 , then a message like " move forward" has to be displayed.

if testimg = img2 , then " move left " message and so on .


Can anyone tell me which technique i have to use for comparing this images and which function to display message ?


If possible, please include some helpful links too ...

"Nithin Chandy" <diskoverx@gmail.com> wrote in message <jbpvi4$daj$1@newscl01ah.mathworks.com>...
> Hi all,
>
>
> I'm new to Matlab. Right now, I'm working on a project named " Face controlled Electronic wheel chair " and i m using Digital image processing Technique.
>
> Since i'm new, i got stuck halfway.
>
> What i did so far is, i wrote codes for capturing image from camera , then convert it to grayscale, removing salt and pepper noise and then converted it to binary image.
>
>
> What i have to do next is , i need to compare this image with a set of images.
>
> For example :
>
> if testimg = img1 , then a message like " move forward" has to be displayed.
>
> if testimg = img2 , then " move left " message and so on .
>
>
> Can anyone tell me which technique i have to use for comparing this images and which function to display message ?
>
>
> If possible, please include some helpful links too ...
Start by checking the newsgroup for keywords like: compare images
This will give you a large number of relevant hits. There is an example of a very simple method suggested by imageanalyst, along with other answers that give you a feeling for the complexity of your question--especially if you have color images.
Barry

Why on earth do you have salt and pepper noise? That shouldn't
happen. You need to get a new camera. Lots of ways to compare images
depending on how similar they are, such as normxcorr2(), or
calculating the PSNR. You should also check out the sections here:
http://iris.usc.edu/Vision-Notes/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics