Hi there Thanks to those people who replied to my phase wrapping problem, I think I understand the situation better now. I have (possibly...

Hi there Thanks to those people who replied to my phase wrapping problem, I think I understand the situation better now. I have (possibly obvious) question with regards to Fraunhofer diffraction, please help! Basically I'm confused as to the difference between a point spread function (obtained using an FFT) and the images that you see on photographic film in standard optics textbooks, e.g. f...

Hello Thanks for ur replies..... I did that and now I get one more error. Basically I have wrritten small code which are used in the final...

Hello Thanks for ur replies..... I did that and now I get one more error. Basically I have wrritten small code which are used in the final code. such as extbeamlts.m and it is used here. Again this extbeamlts.m file has 2 different codes in them named extractboundary.m, integral.m and weight4.m . Please see this errror and let me know what to do.. is it because the size of my image is t...

hi all, Is anyone doing a project in 'feature based digital image watermarking'? if so, mail me.i want know more abt mexican hat ...

hi all, Is anyone doing a project in 'feature based digital image watermarking'? if so, mail me.i want know more abt mexican hat filtering using matlab.waiting for the reply. friendly, bala.

hello forum a question about the DFT amplitudes: Using matlab, I can take the fft2 of an image (NxN). To obtain the correct amplitudes for...

hello forum a question about the DFT amplitudes: Using matlab, I can take the fft2 of an image (NxN). To obtain the correct amplitudes for the freq.. components, do I need to multiply the DFT output by N^2? Does the intersample distance deltax play any role? thanks marco

Hi all I'm trying to convert RGB to ycbcr420. but I don't know how to do that, if one bmp image is converted to ycbcr,I'll try to this...

Hi all I'm trying to convert RGB to ycbcr420. but I don't know how to do that, if one bmp image is converted to ycbcr,I'll try to this code, ycbcrimage=rgb2ycbcr(RGBimage); but this ycbcrimage is 4:4:4 mode, isn't it? What can I do to get ycbcr420? Help me,anyone who know that! thank you

Hi, everybody I believe everyone has already used line(), plot() and plot3() functions to draw line 2-D or 3-D image. My quesion is how do...

Hi, everybody I believe everyone has already used line(), plot() and plot3() functions to draw line 2-D or 3-D image. My quesion is how do these function work, which kind of algorithm or formulas are they based on? Thank you Hao

Hello everyone, I am trying to copy a JPEG file to the GUI using the below command A =...

Hello everyone, I am trying to copy a JPEG file to the GUI using the below command A = imread('picture1','jpeg'); image(A) The problem is that it gets copied on the axis where I have to plot my graph .I need the figure to be placed some where on the GUI for the user to see it.I created the GUI by drag...

Hi, I am looking for a subroutine, which defines a region of interest (ROI) on an image using the mouse. The output should be a...

Hi, I am looking for a subroutine, which defines a region of interest (ROI) on an image using the mouse. The output should be a matrix containing only the pixels within the ROI. I am currently using Matlab 6.1. Thanks in advance,

Hi I'm facing this problem while executing some image compression codes in matlab. " Maximum recursion limit of 500 reached. Use...

Hi I'm facing this problem while executing some image compression codes in matlab. " Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit. Be aware that exceeding your available stack space can crash MATLAB and/or your computer."

hi How can I find number of edge points in a image.I don't want to use the built-in function.

hi How can I find number of edge points in a image.I don't want to use the built-in function.

hi i am using matlab for the first time and have heard that ppl in this group r quite helpful. i am not able to understand...

hi i am using matlab for the first time and have heard that ppl in this group r quite helpful. i am not able to understand properly these two commands : 1)To create the binary gradient mask BWs = edge(I, 'sobel', (graythresh(I) * .1)); what is sobel ,

i want to do an average filtering to a binary image. here's how i do it : i = imread('someimage.bmp'); fil = ones(3,3)/9; ...

i want to do an average filtering to a binary image. here's how i do it : i = imread('someimage.bmp'); fil = ones(3,3)/9; i2 = imfilter(i,fil,'replicate'); and then i compare it to a code that i wrote. it essentially calculates the avg ofa 3x3 neighborhood.

Hi all, I am doing a digital fingerprinting project and I am stuck on how to perform a normalized autocorrelation on a radon transform could...

Hi all, I am doing a digital fingerprinting project and I am stuck on how to perform a normalized autocorrelation on a radon transform could anyone on this forum help me please? I have literally taken the radon transform of the image which returns R and xp matrices, then apply xcorr2 to R...the computation takes over 4 minutes and I need to log map it

Hi, I have a matrox videocard which can support 10 bits/color. (1024 levels per color) I was wondering if there is a way in...

Hi, I have a matrox videocard which can support 10 bits/color. (1024 levels per color) I was wondering if there is a way in Matlab to display 1024x1024x1024 images. Thanks, Osman

Hi, I am working on the particle analysis and automatic cell counting. I have successfully managed to threshold the image. However,there is...

Hi, I am working on the particle analysis and automatic cell counting. I have successfully managed to threshold the image. However,there is another thing that is a problem. I get a lot of unclosed circles. This is happening because part of the nanocrystal is merged with the background.I would like to close the circles first and then use "imfill" to fill them. Does anyone know how to comple...

Hi, I am using mpeg-2 like compression. I intend to use only I frames and P frames for my intial implementation (no B...

Hi, I am using mpeg-2 like compression. I intend to use only I frames and P frames for my intial implementation (no B frames). I have following questions about each of them, please see if u can help me: 1. For I frame: I have obtained quan

Hi ppl, I am using matlab for working on a BRAIN IMAGE. By using the imcontour command, i was able to plot the different parts of the...

Hi ppl, I am using matlab for working on a BRAIN IMAGE. By using the imcontour command, i was able to plot the different parts of the brain as contours. I have to find out the areas enclosed in those contours. I have stored the contour as [C,h]=imcontour(x); I am not able to extract information for a particular patch (using its handle)

Hello everybody, I am working on image compression. I use Matlab to make all my tests. Now I want to use a DSP, and I probably will convert...

Hello everybody, I am working on image compression. I use Matlab to make all my tests. Now I want to use a DSP, and I probably will convert all my .m in .c. I ve got two questions : 1- Is it better to use -mcc, or write myself all the functions in c ? I suppose I know the answer... so my 2nd question will be : is it easy to convert matlab functions in c ? (because I use a lot of ma...

I am interested in extracting features from an acoustic echo signal, which shall be lauched into the sea. if somehow we can extract features...

I am interested in extracting features from an acoustic echo signal, which shall be lauched into the sea. if somehow we can extract features which would be unique to objects in the sea, eg ships submarienes etc, it can help in classifying them. i believe features should not get affected from the channel like sea, and i must be able to reconstruct a 3D image of the target being interogated. P...

Deepak, my bad. it should be fname = ['pic' num2str(i) '.bmp']; (see those little single inverted commas that i...

Deepak, my bad. it should be fname = ['pic' num2str(i) '.bmp']; (see those little single inverted commas that i missed previously) this shud work Tarang On Wed, 8 Sep 2004 12:32:44 -0700 (PDT), deepak ropireddy