Hello! I have been trying to implement an image in image search algorithm using fft, as described in the dspguide, chapter 24...

Hello! I have been trying to implement an image in image search algorithm using fft, as described in the dspguide, chapter 24 (http://www.dspguide.com/), using FFT Convolution. As far as I have understood it, the search image is used as some kind of a filter (like sharpen, etc.) on the original image (in which I search) in order to give the resulting image a distribution of similarity of...

Hi, I hope this question about wavelets is not too far off topic in this forum... I have some image data with noise for which the noise...

Hi, I hope this question about wavelets is not too far off topic in this forum... I have some image data with noise for which the noise statistics (mean, variance) are known : noisy image = true image + noise in image domain In my case, the mean and variance is not constant over the image (correlated noise). When I perform a wavelet transform on this noisy image, I presume I can ...

I am always confused by the padding for image filtering. I have an 270x230 "image" and is to be filtered with a 250x250 "filter". I have...

I am always confused by the padding for image filtering. I have an 270x230 "image" and is to be filtered with a 250x250 "filter". I have made sure that the sum of all filter coefficients sum to be 1. In Matlab, sum(sum(filter)) =1.0000, then I do image filtering: result=imfilter(image, filter, 'same'); so the result is the also a 270x230 image... since I've used 'same' option,...

Hi, I have no experinece in either image processing or matlab. I am a little confused about image types and image processing toolbox...

Hi, I have no experinece in either image processing or matlab. I am a little confused about image types and image processing toolbox in matlab, and i appreciate if anyone could please clarify these confusions. So here is my problem: According to image processing tool box users's guide, an intensity image is stored in a single 'intensity matrix' that contains double precision values rang...

Under the same circumstances, I get 15 X ray images I1, I2, I3, ?,I15. Then two methods were used to get the noise only image. First...

Under the same circumstances, I get 15 X ray images I1, I2, I3, ?,I15. Then two methods were used to get the noise only image. First method: Noise image=(I1-I2)/sqrt(2). They said that subvided by sqrt(2) can maintain the variance of the Noise image identical to I1 and I2. Second method: Noise image=I1-(I1+I2+I3+?+I15)/15. Can this method maintain the variance of noise image identi

HI all, I am have a tiny image filtering with my 2D Gaussian filter. The Gaussian filter is 20 times larger than the tiny input image in both...

HI all, I am have a tiny image filtering with my 2D Gaussian filter. The Gaussian filter is 20 times larger than the tiny input image in both X and Y size. Are there any methods to speed up my convolution? Since I just want the same size output as my tiny input image size; can I truncate the Gaussian filter to be the same size as the tiny input to make the filter and the image the s...

I'm trying to display the picture that the dskCam takes on Code composer studio. However, the image that i see on Code composer studio(view->...

I'm trying to display the picture that the dskCam takes on Code composer studio. However, the image that i see on Code composer studio(view-> graph-> image) doesnt seem to be right. I captured the screeen which shows the image, and you can check that here -> http://www-personal.umich.edu/~dokang/image.bmp fllowings are parts of my code that i'm using. -> http://www-personal.umich.e

Looking for an experienced image processing algorithm development software engineer. Familiarity with TI 642 DSP processors, C++, and Code...

Looking for an experienced image processing algorithm development software engineer. Familiarity with TI 642 DSP processors, C++, and Code Composer is required. The candidate will be required to integrate and develop image compression and image stabilization algorithms. Experience in other image processing functions is beneficial. Location: Albuquerque NM Duration: 6 month Rate: $50 - $90/...

Hello, I have a program that performs FFT convolution to search for occurrences of a small image inside another image. I feel like I...

Hello, I have a program that performs FFT convolution to search for occurrences of a small image inside another image. I feel like I understand the concept, but my program doesn't do what it should. The small search image is simply cut out from the larger image, so I should see a bright spike in the resultant FFT convolution. But I am seeing a very ambiguous result. I created a web...

Hi all, I've recently begun trying to understand the fundamentals of lossy image compression via transforms such as DCT and...

Hi all, I've recently begun trying to understand the fundamentals of lossy image compression via transforms such as DCT and Wavelets (CDF9/7). In a paper I was reading it suggested that prior to applying a forward transform that a "reflection image" of the original image be created. This involves flipping the image vertically and horizontally and copy those flipped variants above, be...

I have a problem with one of my assignments and I hope any of you could help me out. Take the phase of the clown image(file clown.tif) and the...

I have a problem with one of my assignments and I hope any of you could help me out. Take the phase of the clown image(file clown.tif) and the magnitude of the Mandrill image (Mandrill.tiff) and combine them into a new synthetic image. Show the magnitude plot for the clown image,the phase plot for the mandrill image and inverse transformation of the result using(ifft2).

I have what I have to assume is a stupid mistake on my part. I am able to take the fft of an image and get back the half of the transformed image...

I have what I have to assume is a stupid mistake on my part. I am able to take the fft of an image and get back the half of the transformed image as I should. When I try to do a inverse fft on the data from the fft I get really big numbers like 10^71 size numbers. When I would expect to get my original image times 640*480, the size of my image. My first question is do I have to create the othe...

Hi All, I am performing Integer DCT on Lena image. I am using " C "& i am not able to reconstruct the image correctly. Before applying DCT I...

Hi All, I am performing Integer DCT on Lena image. I am using " C "& i am not able to reconstruct the image correctly. Before applying DCT I am subtracting 128 from all pixels of input image. After IDCT i am adding 128 to the result image. I want to compare my results with MATLAB . Is anybody know how to use dct i.e. dct2 function of MATLAB? if anyone has the related code in MATLAB please...

I was wondering if there was a relatively straightforward algorithm for compressing image using Fourier transforms. I was thinking that I could...

I was wondering if there was a relatively straightforward algorithm for compressing image using Fourier transforms. I was thinking that I could transform an image into frequency space and then perform a lowpass filter on the image to set all the lesser frequencies to zero, then perform a run-length-encoding on the data to pack the zeroes. However, I have been running into trouble with this me...

Hi! I'm developing an image processing algorithm for the ADSP21369 and trying it into de EZ-KIT 21369... I load the image (640*480 bmp image)...

Hi! I'm developing an image processing algorithm for the ADSP21369 and trying it into de EZ-KIT 21369... I load the image (640*480 bmp image) with the Image Viewer into SDRAM and process it directly from SDRAM. Trying to do it with the DMA I found that there are no significatively difference betwen them. That's possible?? Or I'm doing somethimg wrong?? I measure times like this: STA...

Hi friends, i am dinesh. i am doing texture analysis and image segmenatation using gabor wavelets in java.. so far i have successfully...

Hi friends, i am dinesh. i am doing texture analysis and image segmenatation using gabor wavelets in java.. so far i have successfully finished doing texture analysis using gabor wavelets.. now i have to do image segmentation.... actually my work is decamouflaging, that is multiple camouflage breaking, finding the objects that are hidden in the given image because of its same texture as t...

Is there a free tool for Matlab based (or other) for doing image/video enhancement: 1. Zooming in using various interpolation (bi-cubic...

Is there a free tool for Matlab based (or other) for doing image/video enhancement: 1. Zooming in using various interpolation (bi-cubic etc.), 2. image enhancement using spatial correlation, 3. image enhancement using succeeding images series. Thanks, IM

Hi, guys I've got a question on photographic correlation for doing inspection by cross correlation. I can find sub-image inside the original...

Hi, guys I've got a question on photographic correlation for doing inspection by cross correlation. I can find sub-image inside the original image, however, I don't have an idea if the images have been taken at far different distances, so the resolution of the big image and sub-image are different. Can anybody tell me theoratically on this? thank you very much. Sangthong

Hi all, I am a beginner in matlab and i seriously need your help. MY PROBLEM: I have a grayscale image(1024 X 1280) of a pyrovalve(a...

Hi all, I am a beginner in matlab and i seriously need your help. MY PROBLEM: I have a grayscale image(1024 X 1280) of a pyrovalve(a valve used in rocket engines, looks like a small piston cylinder arrangement). I was asked to do fourier analysis(2D) on this image. For that i took FFT2 of the image. I can get the absolute frequency values. I have to make a 3D plot of the frequency mag...

Hi Guys, One of the professors working with the IEEE Image Processing Society recently asked me to review a manuscript of an image...

Hi Guys, One of the professors working with the IEEE Image Processing Society recently asked me to review a manuscript of an image processing paper being considered for publication. After telling the professor that I wasn't qualified to review image processing papers he asked if I knew anyone who was qualified. I couldn't think of anyone but I told the professor that I would...