relational "convolution"

Started by Fabio Mazzone in Matlab DSP17 years ago

Hi Matlabist! i want to process an image, precisely i need to build a relational filter, applying a kind of convolution (but...

Hi Matlabist! i want to process an image, precisely i need to build a relational filter, applying a kind of convolution (but relationa, i can't use a normal convolution) on the whole image. i want to process the image step by step on small region of interest on it, let's say a


Cylindrical Coordinates 2D Image

Started by amit ailiani in Matlab DSP16 years ago

Hello All,   I want to  find the center of the image and defined one variable as theta which is fixed. Draw a line...

Hello All,   I want to  find the center of the image and defined one variable as theta which is fixed. Draw a line passing thru the center of the 2 dimensional image at fixed angle theta and consider those pixels which lie on that particular line and display as


Drawing a line

Started by aniketsamant2004 in Matlab DSP14 years ago

I have an image, and the magnitude and the orientation values of the gradient of the image. I want to draw the gradients in the image. The ...

I have an image, and the magnitude and the orientation values of the gradient of the image. I want to draw the gradients in the image. The length of the line represents the magnitude and the angle denotes the orientation of the gradients. Is there any way of drawing this in MATLAB?


Image help

Started by Laiq Azam in Matlab DSP13 years ago 1 reply

Hello all!! I am trying to write a simple code: I've to read a jpeg color file stored in my hard drive, select a small portion of the...

Hello all!! I am trying to write a simple code: I've to read a jpeg color file stored in my hard drive, select a small portion of the image, and reproduce it with another name. Any help is appreciated.... Thanks. -- Laiq


Is there any algorithm to produce glary effect on digital image.

Started by shashi kumar in Matlab DSP15 years ago 1 reply

hi there,           i am working in the field of image processing for past 6 months, rigth now i am stuck in the middle...

hi there,           i am working in the field of image processing for past 6 months, rigth now i am stuck in the middle of my project where in  it is required to produce a glare/ shining surfces in a dull digital image. please if any of u know t


GUI -- HOW TO Get a dynamic filename based on input filenames - MATLAB GUI

Started by vishwa in Matlab DSP13 years ago 1 reply

Dear Sir/friends I have a GUI for image processing. In that I have TWO push buttons for loading two images. Third push button for CALCULATE...

Dear Sir/friends I have a GUI for image processing. In that I have TWO push buttons for loading two images. Third push button for CALCULATE (histogram) Here I should have an option of saving the set of two input images, resulting histogram data as a .MAT file for later retrieval. The file name should be = cocatenation of the two image file names (since I may use any image pairs) I used ...


Raw data to image format conversion

Started by anujack_21 in Matlab DSP16 years ago 1 reply

Hi all, Can a raw data file be stored as an image file without any loss? I read a raw data file into matlab using fread...

Hi all, Can a raw data file be stored as an image file without any loss? I read a raw data file into matlab using fread command( the file size is around 35MB and is 12 bit precision).When I used imwrite to save this raw data file to an image file, there was loss of data


Reg Image processing

Started by Yogesh Ganapathy in Matlab DSP14 years ago 1 reply

Hello friends, I am doing a project in lossless image compression. Do any of you have the coding in matlab for SPIHT algorithm or for...

Hello friends, I am doing a project in lossless image compression. Do any of you have the coding in matlab for SPIHT algorithm or for integer wavelet transform. If you know the source from where to get the code then pls mention the web address. Thanks Yours friendly, Yogesh


how to upsample an image?!

Started by Fatemeh Ardakani in Matlab DSP11 years ago

hi everybody i have problem upsampling an image! this is my...

hi everybody i have problem upsampling an image! this is my code: image_1=image(:,:,1); image_2=image(:,:,2); image_3=image(:,:,3); image_1_up=upsample((upsample(image_1,2))',2)'; image_2_up=upsample((upsample(image_2,2))',2)'; image_3_up=upsample((upsample(image_3,2))',2)'; image_up(:,:,1)=image_1_up; image_up(:,:,2)=image_2_up; image_up(:,:,3)=image_3_up; imshow(image_up) but it...


scaling an image

Started by gandhi mathi in Matlab DSP17 years ago 2 replies

hai, How can I scale an image and imshow it. mathi

hai, How can I scale an image and imshow it. mathi


PCA image compression

Started by Valeria in Matlab DSP15 years ago

Dear all, I am looking for some Matlab code that implement image compression using Principal Component Analysis (PCA). Best...

Dear all, I am looking for some Matlab code that implement image compression using Principal Component Analysis (PCA). Best regards, Valeria Leite


show red only in image

Started by icearie55 in Matlab DSP15 years ago 2 replies

Hi, sorry for 2nd msg....maybe i did not make myself clear in the first. i know that red in colorspace is [:,:,1] but, if i am...

Hi, sorry for 2nd msg....maybe i did not make myself clear in the first. i know that red in colorspace is [:,:,1] but, if i am supposed to write codes for an image of array, say [200 180] how do i go about getting to know how many pixels of red are there in the above array? knowing that rgb is 255 0 0 for red, but, i need to do a


Handling Large Image

Started by Najmus Sadat in Matlab DSP11 years ago

I am new in Matlab Image Processing. I cant read large images(2Kx2K) with imread function. Can any1 help me regarding this? sadat.

I am new in Matlab Image Processing. I cant read large images(2Kx2K) with imread function. Can any1 help me regarding this? sadat.


estimating the background pixel values

Started by ashwin99m in Matlab DSP12 years ago

hi all the need to extract the background pixel values of an image. for this i have written the following...

hi all the need to extract the background pixel values of an image. for this i have written the following code: background=imopen(I,strel('rectangle',[480,640])); i need the background pixel values for the pixels in the image and here I is a gray scale image with size 480*640. could anyone tell me if this is the correct code or does this need any changes. plz explain thanks i...


color image

Started by Laiq Azam in Matlab DSP13 years ago 3 replies

Hello all, Does anybody have a simple code of reading and processing a color image in matlab, taking average of pixel (4 next pixels left and...

Hello all, Does anybody have a simple code of reading and processing a color image in matlab, taking average of pixel (4 next pixels left and right)..... I would appreciate any feedback.... Thanks. -- Laiq


Blurring an image

Started by sanguinettir in Matlab DSP16 years ago 1 reply

Hello, everybody... I would like to know how I can blur an image using matlab. Is there any pre-existing command to perform it?...

Hello, everybody... I would like to know how I can blur an image using matlab. Is there any pre-existing command to perform it? Thanks in advance.. Ralph


Ridge frequncy estimation of fingerprint image for Gabor filter

Started by paria rahmani in Matlab DSP14 years ago

Hi.I'm working on fingerprint image enhancement & minutiae extraction,i don't know how to estimate ridge frequency of fingerprint image to...

Hi.I'm working on fingerprint image enhancement & minutiae extraction,i don't know how to estimate ridge frequency of fingerprint image to filtering by Gabor filter(in time domain not in frequency domain).if anyone can help me,please contact me. Thanks a lot.


image segmentation

Started by Anshu in Matlab DSP15 years ago 1 reply

Hi all   I have a 144 X 144 image and I want to divide it into 144 images of 12X 12 size each.Is there any matlab function to...

Hi all   I have a 144 X 144 image and I want to divide it into 144 images of 12X 12 size each.Is there any matlab function to do this?   Anshu __________________________________________________


Need info about image processing

Started by cesar acosta in Matlab DSP11 years ago

Hi everyone, i need any information about the basic aspect of image processing using matlab and simulink. If you could refer me a good free...

Hi everyone, i need any information about the basic aspect of image processing using matlab and simulink. If you could refer me a good free tutorial or book will be nice. regards, Cesar Acosta


gray scale image

Started by Laiq Azam in Matlab DSP12 years ago

Hello all, I m trying to use imread command to read a jpg file. When I use image command to show the matrix, it gives me color, although the...

Hello all, I m trying to use imread command to read a jpg file. When I use image command to show the matrix, it gives me color, although the file I read was gray scale. Even with imshow, it shows weird colors, any help?????? A=imread('babby.jpg'); image(A) figure; imshow(A); title('Original Picture'); -- Laiq