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


How to obtain the result faster when dealing with array?

Started by vin_ng_2000 in Matlab DSP16 years ago

I find that it is very time-consuming when using for loop to access the array. Here is my problem: I have to construct a 3D...

I find that it is very time-consuming when using for loop to access the array. Here is my problem: I have to construct a 3D array by comparing two image files. I have to compare the pixel (r, c) in the left image and (r, c-d) in the right image, where d is 0 to 20.


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


Batch Image Processing

Started by roopireddy in Matlab DSP15 years ago 3 replies

Hi, I have a specific problem in Image Processing. I have an image in BMP format and I perform contrast enhancement on this...

Hi, I have a specific problem in Image Processing. I have an image in BMP format and I perform contrast enhancement on this image and write it in jpeg format. But, the problem is I have to perform this operation on 500 images. Can I write a matlab script file to perform batch


viewing a file as an image..??...

Started by Khubaib in Matlab DSP17 years ago 3 replies

Dear members..i am an electrical engg.. And doing an image processing project. The problem is that i want to view a Y pixels file...

Dear members..i am an electrical engg.. And doing an image processing project. The problem is that i want to view a Y pixels file (.Y file) as an image. So, that a print of it can be taken..Is there any command in matlab that can take a file ( having pixel values in it), and pr


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


Writing the colorbar to an image

Started by Sean in Matlab DSP16 years ago 1 reply

I'm trying to get the color bar from the current figure along with the numeric annotations along the side of the bar into a standard...

I'm trying to get the color bar from the current figure along with the numeric annotations along the side of the bar into a standard color image matrix in order to write the color bar--and nothing else-- to an image file (e.g., Windows BMP). Is this possible? Due to figure dim


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


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,


3D DCT of a image

Started by suganya boopathy in Matlab DSP17 years ago

Hello,   I am involved in a project work on image compression. I want to get an image and find 3D DCT (8x8x8 block). Tell me...

Hello,   I am involved in a project work on image compression. I want to get an image and find 3D DCT (8x8x8 block). Tell me how to get a sequence of 8 images and find DCT.   Thankyou, Suganya


too long an image

Started by ritwik kumar in Matlab DSP16 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


camera calibration !

Started by Mahmood Zeydabadi in Matlab DSP15 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?


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


Drawing lines in output image

Started by MOINUL ISLAM in Matlab DSP14 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.


Dynamic Axes Creation in MATLAB GUI

Started by imagetigers au in Matlab DSP15 years ago 1 reply

Hello Friends, I'm doing my  project in the area of image storage and retrieval in image databases. In my retrieval GUI,i need to...

Hello Friends, I'm doing my  project in the area of image storage and retrieval in image databases. In my retrieval GUI,i need to create axes(to display the image) dynamically.The number of axes will be known only at the run time(by means of a variable).If anyone could help me


Image

Started by Ramesh in Matlab DSP15 years ago 1 reply

Hi,     Is there any function in MATLAB that can divide a given image into blocks of desired size. I know there's blkproc that...

Hi,     Is there any function in MATLAB that can divide a given image into blocks of desired size. I know there's blkproc that can divide the image into blocks aof desired size..but then it does some processsing as well.....I need a function that just divides the image into blocks


[Image Processing] Overlaying two dicom Image Files

Started by kalyanramu vemishetty in Matlab DSP16 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


How to use griddata to reconstruct image?

Started by anub...@gmail.com in Matlab DSP13 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?


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


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?