## Forums Search for: Image

## convert uint16 image (data) to uint8 image (data)

inHello! I want to convert uint16 data to uint8 data. I try with uint8 function but it returns only 255. Ok i understand, what is more than 255...

Hello! I want to convert uint16 data to uint8 data. I try with uint8 function but it returns only 255. Ok i understand, what is more than 255 in original image (uint16) rounds to 255. Is there any function that does also rescaling data from range [0 65535] to [0 255]. Thank you!!! Marko

## code for sum and difference hisograms of an image

hai friends, can any one from our gruop help me in writing code for "Sum and difference histograms of an image" , so that i can caluculate...

hai friends, can any one from our gruop help me in writing code for "Sum and difference histograms of an image" , so that i can caluculate the features like ENTROPY, CONTRAST, HOMOGENITY,CORRELATION etc., And also please let me known whether this approach is better when compared with CO-OCCURRENCE MATRIX. with regars: Raghav

## magnitude of FFT of an image

Hai, how can I get the magnitude of the FFT of an image. gandhi

Hai, how can I get the magnitude of the FFT of an image. gandhi

## Hi

I have a problem of for loops. I saw the messages about them but it did not help me. I want to filter my matrix(actually an...

I have a problem of for loops. I saw the messages about them but it did not help me. I want to filter my matrix(actually an image) by a filter and I want to convolve(2D) my filter with my image. If I use for loops, I need two of them, but the execution is too slow. Can

## Boundary Detection using MATLAB

Does anyone have any experience on detecting a boundary of a 2D image using MATLAB and/or obtaining the co-ordinates of points...

Does anyone have any experience on detecting a boundary of a 2D image using MATLAB and/or obtaining the co-ordinates of points along the boundary of a 2D image ? Please let me know. Thank You, Aditya

## Image Processing Toolbox - Image transformation

I am using the cpselect function in order to identify certain points in two images. I then try to transform these images with...

I am using the cpselect function in order to identify certain points in two images. I then try to transform these images with a linear conformal mapping. My trouble is this: the two images are slightly shifted in the x and y dir. When using the tool box I can only seem

## rows and columns of an image

inDears Matlab users. Hi: I want to know how could I know the number of rows and colums of an image. I mean, I select with some...

Dears Matlab users. Hi: I want to know how could I know the number of rows and colums of an image. I mean, I select with some function the element (x,y) of a matrix and I want to know the values of x and y (the row and the column that these values represents). What is the func

## Intensity Profile

inHi Everybody, I am a newbie to Matlab ..I am facing problem while plotting the intensity profile for the entire image.... Can...

Hi Everybody, I am a newbie to Matlab ..I am facing problem while plotting the intensity profile for the entire image.... Can anybody suggest me the fuction which supports to retrieve the intensity values for each pixel in the Image.. Thanks in Advancce...I need this help very urgently... With Regards, Ambika.S

## simple images in GUI

inHi! I need to put a logo in a GUI, but I don't want to make any image processing stuff on it. I've use the imread and the image...

Hi! I need to put a logo in a GUI, but I don't want to make any image processing stuff on it. I've use the imread and the image commands but it takes a lot of time since matlab convert the picture in a matrix. Is there a way to "fastload" the picture in the GUI? I

## Image Registration..

Hai everybody, I am trying to register two color images(one is the reference and the other is the rotated as well as shifted and...

Hai everybody, I am trying to register two color images(one is the reference and the other is the rotated as well as shifted and scaled) using Log polar transform.Here is the algorithm: I first converted the color to gray scale image Then applied fourier transform

## iptregistry.dll ??

hi I have been working ona video watermarking code, in which i have used some image processing functions of image processing...

hi I have been working ona video watermarking code, in which i have used some image processing functions of image processing toolbox. Everything works fine as a matlab .m file, but if I compile the program into a .C executable file., then it gives the follwing er

## Image segmentation and tracking .... HELP!!! anyone got a clue?

inHI, I would appreciate some help.... I am trying to write a program in MATLAB that will segment moving objects, for example cars, from a...

HI, I would appreciate some help.... I am trying to write a program in MATLAB that will segment moving objects, for example cars, from a series of images (extracting each frame from a video) and that superimposes on each object its bounding box. Has any one got an idea? The images are RGB. and the bounding boxes must be seen on the RGB image not binary or grayscale.

## Creating a symbolic 2D from spline format

Perhaps any of you has been dealing with this issue that has stopped me for some time. I have built a spline approximation to...

Perhaps any of you has been dealing with this issue that has stopped me for some time. I have built a spline approximation to an image, thus giving me a surface representation. I must do operations with this spline-approximated image and its gradient (sum, prod), in order to i

## Fast Fourier Transform

inHI All, Could you please let me know how I can calculate FFT to biary image? The image is Interfile file, that is raw data, in short integer...

HI All, Could you please let me know how I can calculate FFT to biary image? The image is Interfile file, that is raw data, in short integer coded on 2 bytes. The matric size is 128*128. Please help me as I am not familiar with MatLab. Khalid Alzimami Department of Physics School of Electronics & Physical Sciences University of Surrey Guildford, Surrey, GU2 7XH UK tel. +4...

## Hilbert transform of 2D image

Hi I am trying to Hilbert transform a 2D image using the function "hilbert.m". But it is not working as the imaginary part is always coming...

Hi I am trying to Hilbert transform a 2D image using the function "hilbert.m". But it is not working as the imaginary part is always coming zero. Can any body help me in this regard?

## MAT files conversion

inDear All Does anyone know how to convert a .MAT file into an image file The basic problem is that I am using the wavelet toolbox...

Dear All Does anyone know how to convert a .MAT file into an image file The basic problem is that I am using the wavelet toolbox which saves the image compression results in a Mat file so I need to convert it into some standard form to see the result another does anyone

## Please help on image analysis [1 Attachment]

Hai every one , this sis Ravi shastri iam doing my m.Tech project on image analysis to determine the particle size, i facing some errors in my...

Hai every one , this sis Ravi shastri iam doing my m.Tech project on image analysis to determine the particle size, i facing some errors in my code.here i want to do the calculations using matlab and that resut should be enter in Excel sheet. please any on help me regrading. if some one helps me iam very greatful to them . the code is clear all; clc; close all; str_path = ''; str...

## Bitwise Operation on Char type of Array and an Image

hi all, Can anyone tell me how can i perform bitwise opertions like 'bitand' with following input i) image of bmp type ii) text...

hi all, Can anyone tell me how can i perform bitwise opertions like 'bitand' with following input i) image of bmp type ii) text array I really need a help. Thanks in advance, nustian.

## How to normalize an image to zero mean and unit variance

Good everyone, I am working on face recognition. I need your help on how to normalize an image to zero mean and unit variance in MATLAB. In...

Good everyone, I am working on face recognition. I need your help on how to normalize an image to zero mean and unit variance in MATLAB. In addition, I will also appreciate simple explanation on it. Thank you very much. Lijing

## fft2 filtered image recover

inHi I need your help, can anyone tell me how I could recover the original image from a filtered one knowing the filter impulse...

Hi I need your help, can anyone tell me how I could recover the original image from a filtered one knowing the filter impulse response and using the fft2 matlab function. regards Pedro Pedrosa