Color Identification using imhist

Started by Imran Akthar in Matlab DSP16 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);


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 registration fucntions

Started by Anonymous in Matlab DSP18 years ago

Hi, I have Image processing toolbox version 2.2. Some new functions have been introduced in version 3.0 relating to Image...

Hi, I have Image processing toolbox version 2.2. Some new functions have been introduced in version 3.0 relating to Image registration. is there anyway, I can use these new functions without having to pay for the upgradation...some one please help, this is urgent. Thanks,


camera calibration !

Started by Mahmood Zeydabadi in Matlab DSP14 years ago

Dear all, To do a task I need to compute some line's slopes in an acquired image. the problem is that these slopes must be computed in an...

Dear all, To do a task I need to compute some line's slopes in an acquired image. the problem is that these slopes must be computed in an image with ideal intrinsic parameters.In other word I need to normalize the image in hand. the question is that is it enough to idealize(normalize) only two points of each line?


subplot images with different palettes !!!

Started by Khaled Z in Matlab DSP18 years ago 1 reply

Hi every body; I have a very simple question. I need to plot several images in the same figure. I use subplot then imagesc for...

Hi every body; I have a very simple question. I need to plot several images in the same figure. I use subplot then imagesc for each image. when I use colormap after each image, the pallete change affects all images. Is it possible to make each image with its own palette ?? Than


Drawing lines in output image

Started by MOINUL ISLAM in Matlab DSP13 years ago 1 reply

Hi, I have a problem with drawing line between two cordinates in an output image file. I want to display a line in an image generated by...

Hi, I have a problem with drawing line between two cordinates in an output image file. I want to display a line in an image generated by imshow(). Can anybody give me the solution to this? Thanks.


FFT2 question

Started by matlaborioso in Matlab DSP16 years ago

Hi friends, we have a problem. We've an image of 576x768 pixels reconstructed with a CCD camera of 6.35x7.4 micron/pixel. ...

Hi friends, we have a problem. We've an image of 576x768 pixels reconstructed with a CCD camera of 6.35x7.4 micron/pixel. We need make the image FFT2 to know the frequencies of that. We need make a change of phase of Fourier transform of the image because we need


Texture Mapping onto the Mesh

Started by Frederick in Matlab DSP14 years ago

Hi, Given an image and a mesh, how do I map the image on to the mesh by matlab assumed that the texture mapping is known? The things are...

Hi, Given an image and a mesh, how do I map the image on to the mesh by matlab assumed that the texture mapping is known? The things are known: the 3D points the triangular mesh the image the correspondence between the image pixels and points Is there any commands in MATLAB doing the texture mapping? Please give me a short example. Thank you for your help. Regrd, fred


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;


How to use griddata to reconstruct image?

Started by anub...@gmail.com in Matlab DSP12 years ago

I have a randomly sampled grayscale image. How do I reconstruct the image using the griddata function in matlab? i've gone through the help file...

I have a randomly sampled grayscale image. How do I reconstruct the image using the griddata function in matlab? i've gone through the help file but cant understand how to get the input for the function. Can somebody help pls?


colour image processing in matlab

Started by Anonymous in Matlab DSP15 years ago 2 replies

hi, I am trying to apply FFT2 to a colour image (RGB). For this i am thinking of seperating the given image into its...

hi, I am trying to apply FFT2 to a colour image (RGB). For this i am thinking of seperating the given image into its monochrome components and process each one seperately. Is this idea right? If so do we have any matlab function to decompose the given RGB ... ? And moreover after


Neural Network and image segmentation

Started by sam_chensha in Matlab DSP15 years ago

Dear All, I am trying to use Matlab to perfrom image segmentation. I want to set up a Neural network model for image...

Dear All, I am trying to use Matlab to perfrom image segmentation. I want to set up a Neural network model for image processing. Does anyone know the detailed procedures? Is there any mature codes which can be downloaded from Interent? I do appreciate your kin


[Image Processing] Overlaying two dicom Image Files

Started by kalyanramu vemishetty in Matlab DSP15 years ago

Hi all, I am looking for command/method in MATLAB. I have two dicom files. I want to overlay two of these files such...

Hi all, I am looking for command/method in MATLAB. I have two dicom files. I want to overlay two of these files such that the resultant image looks like a 3d picture. Is there any command or example code for this purpose. Any help would


about using an output image in another program as input.

Started by ali_khodaie2002 in Matlab DSP10 years ago

hi, i have 2 different program.i want to use the output image of first program as input image for the second program. image is 512*512.but when...

hi, i have 2 different program.i want to use the output image of first program as input image for the second program. image is 512*512.but when i want to save it it`s size increase to 1024*623. so i can`t use it. can you help me?


Block operation

Started by slumberjer in Matlab DSP18 years ago 1 reply

Hello I have a problem here. If i have a 256-256 image and i want to divide this image into small part say 32x32 block. But!...

Hello I have a problem here. If i have a 256-256 image and i want to divide this image into small part say 32x32 block. But! each of this subimage must overlap 50% by it's nearest neighbors. so a 256x256 can has 15x15 =255 subimage. Then each sub image multipy with 2D hamming w


too long an image

Started by ritwik kumar in Matlab DSP15 years ago

hi, I need to display an image which is much longer and won't fit into a single screen. Using MATLAB GUI is there a way this can...

hi, I need to display an image which is much longer and won't fit into a single screen. Using MATLAB GUI is there a way this can ths image can be displayed with scroll bars attahced automatically? Is there some other convinient way to display such long images in MATLAB GU


Re: how to upsample an image?!

Started by kpk_...@yahoo.co.in in Matlab DSP10 years ago

hi Fatemah The function 'upsample' upsamples the image but inserts zeros in the extrapolated regions. This is the reason you notice checkered...

hi Fatemah The function 'upsample' upsamples the image but inserts zeros in the extrapolated regions. This is the reason you notice checkered appearance in the image as the value '0' gives no (or dark) luminance. Try repeating the previous values instead of inserting zeros. I can give you a function to do this if you want it urgently. otherwise i would suggest you to write a function to d...


spatial filtering

Started by Marinus Lamabelawa in Matlab DSP9 years ago 1 reply

thx form moderator i'm a new member in this group & beginner in matlab may i question about problem in spatial filtering in image...

thx form moderator i'm a new member in this group & beginner in matlab may i question about problem in spatial filtering in image processing how we count convolution method using robert cross gradient operator example : robert operator -1 0 ?0 1 image : A B C D E F G H I J K L M N O P new image in : A11 = A...


image processing

Started by vijetha_moolya in Matlab DSP13 years ago

Hi friends, Can anybody tell me how to construct the pairwise similarity graph for image segmentation using matlab.

Hi friends, Can anybody tell me how to construct the pairwise similarity graph for image segmentation using matlab.


Re: plot on image

Started by Ibrahim muhammed in Matlab DSP9 years ago

I got it! hold on, plot (I,'r'), Done! Ibra ________________________________ From: Ibrahim muhammed To: matlab yahoogroups ...

I got it! hold on, plot (I,'r'), Done! Ibra ________________________________ From: Ibrahim muhammed To: matlab yahoogroups Sent: Sun, August 22, 2010 3:28:01 PM Subject: plot on image Hi guys, I'm really stuck on plotting a line on an image. Any help will be highly appreciated! 1) data=[72 x 154] double figure, pcolor(data), shad