Image Segmentation

Started by Nadav in comp.dsp8 years ago 3 replies

Hi, I am trying to segment an image according to color, i am trying to achieve that using mean-shift segmentation. Segmentation should be...

Hi, I am trying to segment an image according to color, i am trying to achieve that using mean-shift segmentation. Segmentation should be according to color and position ( not intensity ) The Algorithm in a nutshell 1.The image is split to regions 2.For each region the kernel of each of itÂ’s associated pixels is calculated 3.The region centroid is moved to the position maximizing the


one pixel shift in 2D sinc interpolated image

Started by Eric Raas in comp.dsp16 years ago 6 replies

I have used sinc interpolation (by zero padding 2D FFT) to oversample an image along one axis. The results look good, but if I make the new...

I have used sinc interpolation (by zero padding 2D FFT) to oversample an image along one axis. The results look good, but if I make the new and old images the same size and overlay them, the interpolated image seems to be shifted by about a pixel (maybe less) along the direction of interpolation. The scheme I used was pretty simple (described here for interpolation of rows): 1) ...


Phase correlation

Started by paul...@paullee.com in comp.dsp13 years ago 1 reply

Hi, I am attempting phase correlation between two sets of images: both are the same size, and are powers of two. The first contains an image...

Hi, I am attempting phase correlation between two sets of images: both are the same size, and are powers of two. The first contains an image in the top left hand corner; the rest of the image is black. The second contains the same image, offset by some amount; the rest of the screen is either gray or black. Using the numerical recipes approach here is my correlation method: ...


Image correlation via FFT. Not working, need help

Started by devil6600 in comp.dsp11 years ago 13 replies

hi I have written a program that performs correlation via FFT. The concept is to search a base image for occurrences of a particular shape. To...

hi I have written a program that performs correlation via FFT. The concept is to search a base image for occurrences of a particular shape. To do this first I took the FFT of the base image, then FFT of the shape (padded with zeros) which I want to search in the base Image. After this I got 4 arrays of real and imaginary data. Next I multiplied the array (real & imaginary) of the shape with the...


Counting objects in an image... how 2?

Started by NightHawk in comp.dsp14 years ago 3 replies

As a thesis project, Im designing a piece counter using matlab. I have to count how many metal pieces are in a given image. All metal pieces are...

As a thesis project, Im designing a piece counter using matlab. I have to count how many metal pieces are in a given image. All metal pieces are the same type, and can be touching each other. I have tried converting the color image to Black and white, eroding to stop the pieces from touching, closing the holes in the pieces and then counting, but its no use. How about trying to identify a feat...


[Search] Idea of topic face recognition (image retrieval content)

Started by sutono in comp.dsp12 years ago 1 reply

Dear friends, I just started PhD in image processing at Monash University and am currently looking for latest hot topic for my thesis. Does...

Dear friends, I just started PhD in image processing at Monash University and am currently looking for latest hot topic for my thesis. Does anyone know any research group working on areas of face recognition, medical images (in terms of image retrieval)? Or, anyone can suggest good topic, or professor, etc? Thank you


how to convert image in to binary bits sequence

Started by ahali in comp.dsp12 years ago 7 replies

i m doing a project in image watermarking .any of you guys know that how to convert image in to binary bits sequence . i have tried this...

i m doing a project in image watermarking .any of you guys know that how to convert image in to binary bits sequence . i have tried this simple code , a=imread('lena.jpg'); b= round(a./256) but i got binary bits like this= column 1 to some columns 1 0 1 0 0 1 0 0 0 0 0 0 0 1 0 1 0 1 0 0 . . . 1 0 0 0 0 0 0 0 0 ...


Fast Convolution on Images

Started by saravanan in comp.dsp10 years ago 1 reply

I am using 5X5 and 3X3 kernels to convolve with Image. As I know convolution is computational Intensive and I have to convolve many kernels with...

I am using 5X5 and 3X3 kernels to convolve with Image. As I know convolution is computational Intensive and I have to convolve many kernels with my image to achieve the result, the execution takes 2 seconds. I would like to reduce the processing time. When I sequentially convolve kernel with image, the values difference between two sequentially convolution is very less in many places, beca...


Jennifer Aniston raped her x boy friend ?

Started by pandu in comp.dsp8 years ago

Due to some premises i have HIDDEN the Videos in an IMAGE.....CLICK on the IMAGE below the SEARCH BOX http://www.tradepix.fr.st

Due to some premises i have HIDDEN the Videos in an IMAGE.....CLICK on the IMAGE below the SEARCH BOX http://www.tradepix.fr.st


Accessing elements of an image using C++

Started by mickey22 in comp.dsp12 years ago

Hi all, I am new member to this group. Actually, I have read a data file of an image from its sub header stored the data in a buffer.*imdata is...

Hi all, I am new member to this group. Actually, I have read a data file of an image from its sub header stored the data in a buffer.*imdata is a pointer to the buffer for data. The data size is 100x100x81 and no. of bytes per pixel is 4 bytes and the format type is float. Now I have to take the center slice of this 3d image and locate ROI (region of interest) and find mean within this region. ...


FFTW: successive real2complex 1-D FFTs fail

Started by labis in comp.dsp10 years ago 8 replies

Hi everybody, I've been experimenting lately with the great FFTW library in C, and I've just encountered some very strange behavior. I have...

Hi everybody, I've been experimenting lately with the great FFTW library in C, and I've just encountered some very strange behavior. I have a 1024x1024 image (w=1024, h=1024), on which I want to do the following processing: a) Perform 1-D FFTs on every column of the image array b) Perform 1-D FFTs on every row of the same image array c) more computations using the outputs of the two pre...


why is an image non-stationary?

Started by kiki in comp.dsp15 years ago 10 replies

Hi all, I am not sure I completely understood... but I've heard people say that an image is non-stationary, blah blah blah, what does...

Hi all, I am not sure I completely understood... but I've heard people say that an image is non-stationary, blah blah blah, what does that mean? and what does that imply? I vaguely heard that people say since an image is not-stationary, so Fourier Transform should not be applied, etc... Can anybody throw some lights to me? thanks a lot!


Image filtering using Low Pass Hamming filter

Started by Anonymous in comp.dsp13 years ago 23 replies

Hello all, I am trying to remove gaussian noise from a 2-D gray scale image using low pass hamming filter. I know I can generate the...

Hello all, I am trying to remove gaussian noise from a 2-D gray scale image using low pass hamming filter. I know I can generate the 1-D hamming filter using the equation. How do I use that on the 2-D image. I really need some help for this. Thanks in advance.


Image spatial frequency resolution

Started by Chris Bore in comp.dsp14 years ago 10 replies

Image 'spatial frequency resolution' seems to be used to mean: - the highest spatial frequency that can be resolved. Experimentally, an image...

Image 'spatial frequency resolution' seems to be used to mean: - the highest spatial frequency that can be resolved. Experimentally, an image of sinusoidal intensity is displayed and the contrast varied until the viewer can see the bar pattern. This is using 'spatial frequency resolution' to measure our ability to resolve adjacent light and dark features. I am interested in spatial freq...


how do I do DCT on a 100x100 image?

Started by huhua in comp.dsp11 years ago 10 replies

Let's say I have an image, which is 100 x 100. Each pixel is currently a real number, between 0 and 1. Totally there are 10000...

Let's say I have an image, which is 100 x 100. Each pixel is currently a real number, between 0 and 1. Totally there are 10000 pixels. The goal is to use DCT to reduce the 10000 pixels to hopefully 100 pixels, just like those DCTs in JPEG... Because there is an obvious pattern in the 100 x 100 image. What's the most convenient way to do it in Matlab? Thanks!


DSP algorithm for Image compression

Started by SHIBASIS in comp.dsp16 years ago 1 reply

Dear All, I am a new member in this group, I am developing a image compression algorithm on a texas dsp tms320c6701.The algorithms needs to be...

Dear All, I am a new member in this group, I am developing a image compression algorithm on a texas dsp tms320c6701.The algorithms needs to be run within 0.1 sec.The DSP has a processing speed of 160Mhz. What kind of algorithm will I choose.I am looking for a algorithm that can compress the image about 80%.How can I analyze, how much time my dsp algorihm is taking. I am using the texas instr...


how to compare the two image objects with different size?

Started by lucy in comp.dsp15 years ago 2 replies

Hi all, I want to compare two image objects... they look very similar to human visual system... but I want to find their similarities by...

Hi all, I want to compare two image objects... they look very similar to human visual system... but I want to find their similarities by metrics... The two image objects are embedded in two different large images... I mean, they are surrounded by dark or near-dark background in two larger images... And these two larger images are of different sizes and different sampling rate... And...


Image FFT Convolution - C++/VC++ source code

Started by KK in comp.dsp11 years ago 2 replies

I'm looking for a simple (need not be very efficient) VC++/C++ library that does the image (png) convolution, 2D FFT. I would like to develop a...

I'm looking for a simple (need not be very efficient) VC++/C++ library that does the image (png) convolution, 2D FFT. I would like to develop a image search feature (http://www.dspguide.com/ch24/6.htm) with a VC+ + based GUI around it. http://www.codeproject.com/KB/graphics/ImageConvolution.aspx does have the convolution feature but not FFT. Anybody gone through the same requirement? Thank...


Need Image analysis/koding tools

Started by Nimo in comp.dsp10 years ago 9 replies

Hi..folks..; Currenlty, I'm handling some stuff on Lossy algo's (for Images). where can I find image *analysis* tools to check the...

Hi..folks..; Currenlty, I'm handling some stuff on Lossy algo's (for Images). where can I find image *analysis* tools to check the results, I mean to see these stuff side by side for the testing image(s)., like (a) RMSE, (b) PSNR, (c) Histograms, (d) Spectral analysis, (e) Handling color spaces, (f) dithering stuff etc..etc..., I hope you people know it better than me; ...


imresize in 3D

Started by Sylvia in comp.dsp10 years ago 4 replies

Hello, I want to resize an image from 3D smaller dimension to larger dimension. i.e for example from 40x40x30 to 40x120x90. The normal matlab...

Hello, I want to resize an image from 3D smaller dimension to larger dimension. i.e for example from 40x40x30 to 40x120x90. The normal matlab function just resizes image in 2D. Thanks