## LTI Image Interpretation

Started by in comp.dsp7 years ago 7 replies

How would you interpretate this image about LTI systems and convolution?: [img]http://i.imgur.com/JAlHsYs.jpg[/img]

How would you interpretate this image about LTI systems and convolution?: [img]http://i.imgur.com/JAlHsYs.jpg[/img]

## image

Started by in comp.dsp4 years ago

hiiiiiiiiiiiiiiiiiiii i want to know the matlab code for image segmetation using genetic algorithm???????????????????????? plzzz help

hiiiiiiiiiiiiiiiiiiii i want to know the matlab code for image segmetation using genetic algorithm???????????????????????? plzzz help

## How to calculate the frequency of 2D FFT Output image?

Started by in comp.dsp12 years ago 1 reply

Hi, I have a surface image of 15x15 microns which is characterized by 512x512 matrix. (you can see the pic in...

Hi, I have a surface image of 15x15 microns which is characterized by 512x512 matrix. (you can see the pic in http://img363.imageshack.us/img363/7671/pic1tk8.jpg) Now I want to take a 2D FFT of that image. So in matlab I used "FFT = fftshift(fft2(InputImageData))" to get the FFT, which looks like in the pic http://img363.imageshack.us/img363/3346/pic2ne5.jpg But I am not able to judge ...

## Saving a matlab plot as an image help

Started by in comp.dsp10 years ago

Hi everyone, I have a matlab related quetion which can seem simple but it's taking me ages. I am plotting an x and o over an image and I...

Hi everyone, I have a matlab related quetion which can seem simple but it's taking me ages. I am plotting an x and o over an image and I want to save that image whith the same size as the original one. This is what I mean: figure, imshow('data0002.tif'), hold on, figure,plot(Z{2}(1,:),Z{2}(2,:),'rx',hat_X{2}(1,:),hat_X{2}(3,:),'co') With this command I manage to do that, the proble...

## Image Processing Algo on Processor

Started by in comp.dsp16 years ago 8 replies

Hi All, I am working on image compression algo,which needs to be finally processor based.i need some suggestion regarding the time taken...

Hi All, I am working on image compression algo,which needs to be finally processor based.i need some suggestion regarding the time taken to code,test the an image processsing algo in a standard DSP processor such as TI's or in Xilinx FPGA.which one would be better???in terms of time taken and performance..??? cheers MIA

## FFT in Matlab

Started by in comp.dsp15 years ago 1 reply

Hi, Thanks, but it is not an fftshift problem. The image I get is just a shrinking of the original image.

Hi, Thanks, but it is not an fftshift problem. The image I get is just a shrinking of the original image.

## Idea exploration - Image stabilization by means of software.

Started by in comp.dsp15 years ago 27 replies

Basically let the camera take it's picture though user's hand is shaky, and use a mechanism to record down the angle of user's handshake in...

Basically let the camera take it's picture though user's hand is shaky, and use a mechanism to record down the angle of user's handshake in steps of 1us, now I get V = [v0, v1, ...v(n-1)]; With this vector, I calculate displacement vector the image has moved in terms of number of pixels P. Assume the image sensor's voltage rises linearly w.r.t exposure time (or any charactized waveform). ...

## Jennifer Aniston raped her x boy friend ?

Started by in comp.dsp9 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

## Image Segmentation

Started by in comp.dsp9 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

## IIR for image processing in Matlab. How???? (Plz help)

Started by in comp.dsp15 years ago 2 replies

Hello, would any one out there can help me how to appy IIR to filter an 256x256 image using IIR in Matlab? is there any function for it (I...

Hello, would any one out there can help me how to appy IIR to filter an 256x256 image using IIR in Matlab? is there any function for it (I mean 2 D IIR filter). I have to use a IIR filter to filter a image and it is required that I do it in Matlab. I have done it in C and using difference equation: y(m,n)=a1*x(m,n)+a2*y(m-1,n)+..... and everything is fine. Now I have to do it in ...

## one pixel shift in 2D sinc interpolated image

Started by in comp.dsp17 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 in comp.dsp14 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 filtering using Low Pass Hamming filter

Started by in comp.dsp14 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.

## WSQ image library for Texas Instruments family microprocessors released

Started by in comp.dsp11 years ago 1 reply

Cognaxon has released "WSQ image library" for Texas Instruments family microprocessors (embedded systems). Importance of WSQ...

Cognaxon has released "WSQ image library" for Texas Instruments family microprocessors (embedded systems). Importance of WSQ format: Electronic fingerprints submitted to the FBI either through Integrated Automated Fingerprint Identification System (IAFIS), or Electronic Fingerprint Image Print System (EFIPS) may not be compressed with any technique other than WSQ. WSQ image format is su...

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

Started by in comp.dsp13 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

## Counting objects in an image... how 2?

Started by 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...

## Fast Convolution on Images

Started by in comp.dsp11 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...

## Accessing elements of an image using C++

Started by in comp.dsp13 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. ...

## radial/circular average of 2D FFT

Started by in comp.dsp13 years ago

hello, I have a question about image processing and Matlab :). How is it possible to do radial/circular average of 2D FFT. I have an image, I...

hello, I have a question about image processing and Matlab :). How is it possible to do radial/circular average of 2D FFT. I have an image, I did 2D FFT on it, and now I would like to have amplitude over r (r = radius). So, the 2D FFT of my image represents a "spot" now, so I would like to take different values of radius r (to say 10-20, for example), for every radius to calculate the mean v...

## FFTW: successive real2complex 1-D FFTs fail

Started by in comp.dsp11 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...