gradient of an image

Started by ceg9901 in Matlab DSP15 years ago 1 reply

Hi, How to find horizontal and vertical gradidnet of an image.is there any command derivation of an image?. ...

Hi, How to find horizontal and vertical gradidnet of an image.is there any command derivation of an image?.


segment image into same block size (3*3matrix)

Started by becool_hem in Matlab DSP12 years ago

hi all i hav an image and i want to segment that image into 3*3 matrix for further processing can anyone tell me the technique to solve my...

hi all i hav an image and i want to segment that image into 3*3 matrix for further processing can anyone tell me the technique to solve my problem thanks in advance


image processing

Started by Nidur SINGH in Matlab DSP15 years ago

hi all. I have one question for people who are working in Image processing area.Is there facilty available in matlab to segment the 3D image...

hi all. I have one question for people who are working in Image processing area.Is there facilty available in matlab to segment the 3D image toget the section views like MRI scan images. plz confirm it as soonas possible bye to all Nidur


Prob in Image Processing

Started by Moniba Shams in Matlab DSP14 years ago

Dear All I ve a prob with a grey level image in double. When I apply some functions on the image for example IMVIEW and IMSHOW, the display...

Dear All I ve a prob with a grey level image in double. When I apply some functions on the image for example IMVIEW and IMSHOW, the display contains three images instead of one. Can anyone tell why is to so? If the files are required PL let me know. Regards Moniba _______________


Color Identification using imhist

Started by Imran Akthar in Matlab DSP17 years ago 1 reply

Hi all, I am trying to get the maximum occourence of a particular color in an image using imhist command in an image .I first...

Hi all, I am trying to get the maximum occourence of a particular color in an image using imhist command in an image .I first converted the RGB image to indexed image usnig rgb2ind command RGB=imread('a.jpg'); [x,map]=rgb2ind(RGB,128); imhist(x,map);


image filter

Started by kianogo in Matlab DSP16 years ago

Anyone can help with designing exponentially increasing or decreasing image filter? the filtered image looks right but the...

Anyone can help with designing exponentially increasing or decreasing image filter? the filtered image looks right but the amplitudes are wrong !! s=10.*rand(8); %signal [f1 f2] = freqspace(8,'meshgrid'); r = sqrt(f1.^2 + f2.^2); F=exp(r.*30); FS=S.*F;


Entropy of image

Started by Prateek Shrivastava in Matlab DSP17 years ago 1 reply

Hi all, In the calculation of the entropy of an image, ENTROPY = - SIGMA(p log p ) j j 2 j how can we define the parameter...

Hi all, In the calculation of the entropy of an image, ENTROPY = - SIGMA(p log p ) j j 2 j how can we define the parameter 'probability' for an image? Regards, Prateek.


image bands in matlab

Started by nourhan_breem in Matlab DSP13 years ago

hello if anyone can help me in specify image bands using matlab, plzzz replay as soon as possible this is my image registration algorithm...

hello if anyone can help me in specify image bands using matlab, plzzz replay as soon as possible this is my image registration algorithm in which step 8 is related to image band 1. Apply FFT to images I1 and I2 ? F1(x, h) and F2(x, h); 2. Compute the absolute values of F1(x, h) and F2(x, h); 3. Apply a high pass filter to the absolute values to remove low freque...


mrf based segmentation

Started by sonali mehra in Matlab DSP14 years ago

hi all, i am working on image compression, i have encountered a problem while implementing mrf for image segmentation. Could anyone of u...

hi all, i am working on image compression, i have encountered a problem while implementing mrf for image segmentation. Could anyone of u help me by suggesting any link or code source for image segmentation using Markov Random Fields. Please help me. Thanks in advance sonali


Dividing an Image into smaller equal parts

Started by knenny2000 in Matlab DSP14 years ago

Hi all, I am trying to divide a 250x250 image into 25 equal parts each having 50x50 pixels. To divide the image into small parts is not...

Hi all, I am trying to divide a 250x250 image into 25 equal parts each having 50x50 pixels. To divide the image into small parts is not difficult, however when the number of smaller parts of the image gets large it gets quite complicated. Do you know of anything which makes it easier? Thanks Kenny


problem with imwrite

Started by rukmanimohan04 in Matlab DSP15 years ago

hi, I am presently workin on datamarking of images using DCT. I have created the datamark first by splitting the...

hi, I am presently workin on datamarking of images using DCT. I have created the datamark first by splitting the image into 8*8 blocks and then applying DCT to each individual blocks. Then i got the marked image using IDCT. i tried saving this image usi


Image procesing

Started by cesar acosta in Matlab DSP12 years ago

HI, I want to "filter" an image and only left a color, in other words, i want to supress all color that arent the color choosen. I have...

HI, I want to "filter" an image and only left a color, in other words, i want to supress all color that arent the color choosen. I have read the both demo of image segmentation but i really dont understand it. Any ideas ?? Thanks in anvance. Regars, Cesar Acosta


how can i takt wavelet transform from an image and then inverse(transform) it ?

Started by ali_khodaie2002 in Matlab DSP11 years ago 1 reply

hi my dear freinds around the world, i wanted to transform(dwt) an image(barbara)and inverse it.it is my first time i have worked with dwt.these...

hi my dear freinds around the world, i wanted to transform(dwt) an image(barbara)and inverse it.it is my first time i have worked with dwt.these are my codes: X=((imread('barbara.bmp'))); [cA,cH,cV,cD] = dwt2(X,'haar'); Y = idwt2(cA,cH,cV,cD,'haar'); figure,imshow(Y) but the resulting image isn`t like the first image . what `s wrong with my codes? thanks in advance.


Image Segmentation by Quadtree Decomposition

Started by albakrif in Matlab DSP14 years ago

Dear all I'm working on image analysis using quadtree decomp, but I don't know how I can reconstruct the image after applying the...

Dear all I'm working on image analysis using quadtree decomp, but I don't know how I can reconstruct the image after applying the command S = qtdecomp(I,threshold,[mindim maxdim]) Plz if any one can help me with the appropriate command.


Fit image on pushbutton

Started by sjoh...@condor.cnbc.cmu.edu in Matlab DSP14 years ago

Hi, I am using CData property of pushbutton to insert image on a button control. Is there anyway to stretch or shrink the image to fit...

Hi, I am using CData property of pushbutton to insert image on a button control. Is there anyway to stretch or shrink the image to fit the pushbutton dimensions? In my application, the size of the pushbutton may vary based on other factors. Thanks, Sindy


Measure intensity of grayscale image

Started by Syed Nabi Hossain in Matlab DSP11 years ago

Hi, I am using MATLAB R2007a. I am trying to find the number of pixels and each pixel intensity in a given image in simulink. I want to...

Hi, I am using MATLAB R2007a. I am trying to find the number of pixels and each pixel intensity in a given image in simulink. I want to find this for the entire Image. Waiting for the reply as soon as Possible. Thanks in Advance, Syed


Divide image into sub-images

Started by John Adedapo Ojo in Matlab DSP11 years ago 1 reply

Hi all, I am working on image pre-processing. So, in trying to implement a method described in a journal paper, I tried to divide an image into...

Hi all, I am working on image pre-processing. So, in trying to implement a method described in a journal paper, I tried to divide an image into subimages and perform some preprocessing. the challenge was that the pixel info are not being copied into the new sub-images, they are just plain. Please help


code for grey level co-occurrence matrix(GLCM)

Started by raghav_bme in Matlab DSP14 years ago

hai friends, i need matlab code for getting GLCM of an image and also calculate the different features from it like entropy, inertia,...

hai friends, i need matlab code for getting GLCM of an image and also calculate the different features from it like entropy, inertia, homogenity etc., by using this i want to segment the medical image i.e., the mri image of head. with regards: raghav


image processing

Started by Anonymous in Matlab DSP19 years ago

hello, i've a little problem!! i would like to extract from an image with some objects, the center of inertia of each object... ...

hello, i've a little problem!! i would like to extract from an image with some objects, the center of inertia of each object... i don't have the image processing toolbox so i can't use the blob descriptors and the blob m files... HELP ME PLEAZ Thx by advance


Re: segmentation

Started by Tarang Dadia in Matlab DSP15 years ago

I think this code should work It basically segments the image and stores it in a 3 dimensional array which can be accessed by varying...

I think this code should work It basically segments the image and stores it in a 3 dimensional array which can be accessed by varying the 3rd dimension of the array 'a' in code below Hope this helps Tarang im = imread('image.jpg'); % I assume that image size is 144 x 144 xLength = 12; yLength = 12;