Hello All, I found octave to be good for signal processing applications. But is octave good for doing image processing too? The...

Hello All, I found octave to be good for signal processing applications. But is octave good for doing image processing too? The reason why I am asking this, is sometimes back I was using scilab for image processing applications. when I ventured more in depth I found it to be dead slow for processing large amounts of data, and specially if there were any ...

I made a similar post sci.image.processing a while back. I'm trying to understand why a my natural images are higher entropy than...

I made a similar post sci.image.processing a while back. I'm trying to understand why a my natural images are higher entropy than uniform noise. The order from lowest to highest is constant (0 obviously), uniform noise, LPF'd image, same image not LPF'd, gaussian noise My theoretical calculation for uniform noise agrees with what I'm getting -- about 1/256*log2(256)*241^2. Now there a...

John Costella schrieb: > Thanks, mate; I've tried to break it but my resources are limited. > (Would be much easier if my name was Bill...

John Costella schrieb: > Thanks, mate; I've tried to break it but my resources are limited. > (Would be much easier if my name was Bill Gates, but then > everyone would be throwing things at me.) Could you send me > the image that killed it? (Or are you telling me that it dies for all > images with that build?) Pretty any image does that, see below for what I believe the problem is. >

John Costella schrieb: > 12:30 pm CST, November 22, 2007 > > > I am pleased to announce the release of a new image format, which I > ...

John Costella schrieb: > 12:30 pm CST, November 22, 2007 > > > I am pleased to announce the release of a new image format, which I > have somewhat mischievously dubbed "JPEG-Clear", which is optimized > for the following uses, among others: > > * Transmission of images or image sequences compressed losslessly or > lossily through a limited bandwidth channel (such as the Internet), >

Hi, I have been searching for a lecture series on Digital image Processing. Not just a set of lecture notes, but a classroom lecture series....

Hi, I have been searching for a lecture series on Digital image Processing. Not just a set of lecture notes, but a classroom lecture series. I am sure that there is some university somewhere that has recorded a course on Image Processing. Thank You Tom tom_cip_11551@hotmail.com

hello, I have a question about image processing and Matlab :). How is it possible to do radial/circular average of 2D FFT. I have an image, I...

hello, I have a question about image processing and Matlab :). How is it possible to do radial/circular average of 2D FFT. I have an image, I did 2D FFT on it, and now I would like to have amplitude over r (r = radius). So, the 2D FFT of my image represents a "spot" now, so I would like to take different values of radius r (to say 10-20, for example), for every radius to calculate the mean v...

http://www.robotix.in/ Hello People The Robotix Team of IIT Kharagpur has shifted to its new site. A new design, new problem...

http://www.robotix.in/ Hello People The Robotix Team of IIT Kharagpur has shifted to its new site. A new design, new problem statements. Please visit www.robotix.in for details. The Image Processing event can be reached at http://www.robotix.in/image.php

hi.... first of all i would like to introduce myself... my name is johan... right now i'm doing my S1 thesis in information technology..... i...

hi.... first of all i would like to introduce myself... my name is johan... right now i'm doing my S1 thesis in information technology..... i take image restoration topic and.... i'm a newbie in this topic (so... i need a lot of help to understand about the step) and.... i use handbook : image processing theory, algorithms, & architectures by Maher A. Sid-Ahmed it is said that one of the proced...

Dear friends, I just started PhD in image processing at Monash University and am currently looking for latest hot topic for my thesis. Does...

Dear friends, I just started PhD in image processing at Monash University and am currently looking for latest hot topic for my thesis. Does anyone know any research group working on areas of face recognition, medical images (in terms of image retrieval)? Or, anyone can suggest good topic, or professor, etc? Thank you

Hi! I am working over high quality image processing algorithms (image shifts, image rotation, etc). I am trying to use 1D sinc interpolation,...

Hi! I am working over high quality image processing algorithms (image shifts, image rotation, etc). I am trying to use 1D sinc interpolation, but it produces Gibbs artifacts. Is it possible to modify sinc interpolation in some way in order to reduce these artidacts? Perhaps, it is better to use some other interpolations for the case of sharp edges? I have tried to apply some windows (Hann, La...

Hi all, I am new member to this group. Actually, I have read a data file of an image from its sub header stored the data in a buffer.*imdata is...

Hi all, I am new member to this group. Actually, I have read a data file of an image from its sub header stored the data in a buffer.*imdata is a pointer to the buffer for data. The data size is 100x100x81 and no. of bytes per pixel is 4 bytes and the format type is float. Now I have to take the center slice of this 3d image and locate ROI (region of interest) and find mean within this region. ...

Here's a little something I'd like to get suggestions for so I can try them. My problem is the following, for an original image of...

Here's a little something I'd like to get suggestions for so I can try them. My problem is the following, for an original image of given dimensions, you're only given (for example) 6 lower resolution images and by combining them try to obtain something as close as possible to the original full resolution image. Here are in my example the characteristics of the 6 low resolution images : 1st...

i m doing a project in image watermarking .any of you guys know that how to convert image in to binary bits sequence . i have tried this...

i m doing a project in image watermarking .any of you guys know that how to convert image in to binary bits sequence . i have tried this simple code , a=imread('lena.jpg'); b= round(a./256) but i got binary bits like this= column 1 to some columns 1 0 1 0 0 1 0 0 0 0 0 0 0 1 0 1 0 1 0 0 . . . 1 0 0 0 0 0 0 0 0 ...

Hi all, I want to represent image in physical world units. Basically, the image consists of some dots, circles, ellipses, lines, and...

Hi all, I want to represent image in physical world units. Basically, the image consists of some dots, circles, ellipses, lines, and rectangles, etc. But their units should be meters or inches used in the physical world, instead of pixels we often used in the computer world. Is there any data structure and functions (in Matlab) that can facilitate the representation and rendering of such ...

Dear all, I am facing with the following image/signal processing problem: In order to measure image local activity, I take variance....

Dear all, I am facing with the following image/signal processing problem: In order to measure image local activity, I take variance. But variance involves square operation, suppose I am working on NxN blocks, then the N^2 square will need a lot of computation, which is very costly in my current application. Is there any techniques of measuring local activity by way of lower complexity co...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do surface interpolation to reconstruct the missing pixels. Which surface interpolation algorithm can do this job best? I hope this surface interpolation approach will be a lot better than bilinear interpolation, or separable interpolation, am I right? ...

Dear all, I want to ask how to downsample an image and avoid aliasing? How to make sure that an downsampled image can be reconstructed...

Dear all, I want to ask how to downsample an image and avoid aliasing? How to make sure that an downsampled image can be reconstructed perfectly? I guess I am too acquainted with time as my x-axis, now when it comes to 2D spatial domain, I get perplexed... Can anybody give me some enlightenment? Thanks a lot, -Walala

Hi all, I encounter some "problem" while using polyphase filter for interpolation. I have implemented a 8 zero crossing with upsampling of...

Hi all, I encounter some "problem" while using polyphase filter for interpolation. I have implemented a 8 zero crossing with upsampling of L=32. The image I used are a simulated image with 4 sinc impulse response near the four corner. All pixels values are positive. While performing interpolation, such as for rotation operation, I found that some of the values return is negative? ...

Hi all, We used camera to do some imaging and got some raw image data, which are very noisy at the low signal end(where there should be some...

Hi all, We used camera to do some imaging and got some raw image data, which are very noisy at the low signal end(where there should be some low signal) or the dark end(where there should be no signal theoratically)... And there are some some spikes on both dark and bright regions. The bright parts of the image are also noisy... Please advise which type of filter can be best for den...

Hi all, I am not sure I completely understood... but I've heard people say that an image is non-stationary, blah blah blah, what does...

Hi all, I am not sure I completely understood... but I've heard people say that an image is non-stationary, blah blah blah, what does that mean? and what does that imply? I vaguely heard that people say since an image is not-stationary, so Fourier Transform should not be applied, etc... Can anybody throw some lights to me? thanks a lot!