problem with image acquisition toolbox

Started by jacy...@wp.pl in Image Signal Processing10 years ago

Hi! I'm trying to acquire videos using the image acquisition toolbox (v3.0, matlab r2007b) for windows XP. When I acquire a video and transfer...

Hi! I'm trying to acquire videos using the image acquisition toolbox (v3.0, matlab r2007b) for windows XP. When I acquire a video and transfer it in the matlab workspace, everything works! But if I try to store the video (AVI) in my disk, when I set the filename in the logging option (Acquisition parameters), I get such exception: Exception in thread "AWT-EventQueue-0" java.lang.NumberFormat...


image,help

Started by mehrnaz_fani in Image Signal Processing10 years ago 2 replies

hi i want to use the imresize command in matlab but i need to specify the interpolation kernel by myself but i do not know how to use the...

hi i want to use the imresize command in matlab but i need to specify the interpolation kernel by myself but i do not know how to use the input argument {f,w} any body can help me urgent please


Have someone implemented watershed algorithm on the DSP?

Started by jogg...@gmail.com in Image Signal Processing10 years ago

Hi, Before my job is to implement the video codec on the DSP. Nowadays I was required to do image processing on DSP. So I am trying to...

Hi, Before my job is to implement the video codec on the DSP. Nowadays I was required to do image processing on DSP. So I am trying to implement watershed algorithm on C64x+. After reading some paper, I summarize the following: there are popular three implementations. 1. Vincent and Soille's implementation based on immersion 2. Meyer's implementation based on topographic distance 3. wa...


applying dct to colour image

Started by push...@yahoo.com in Image Signal Processing10 years ago 1 reply

I am doing a project in image processing.in this i have to apply dct to rgb image and encode it using turbo codes.after decoding i have to...

I am doing a project in image processing.in this i have to apply dct to rgb image and encode it using turbo codes.after decoding i have to retrieve my original rgb image by applying idct.anyone know this using matlab coding


Wavelet interpolation

Started by snehamoyc in Image Signal Processing10 years ago 1 reply

Hi, I am working on image interpolation using wavelet transformation. I am doing one level wavelet transformation of my data and interpolating...

Hi, I am working on image interpolation using wavelet transformation. I am doing one level wavelet transformation of my data and interpolating all 4 sub bands and inverse transformation to get interpolated image in spatial domain. I am trying with lena image but didn't get any satisfactory result. Here is my matlab code. Can anybody help me out what wrong I am doing with this program? load len...


masks: 2 in a row?

Started by in Image Signal Processing10 years ago 3 replies

Hi all I'm working on masks (prewitt, sobel, mean, etc) with the CImg library. Right now I can apply masks quite well, and I have a question...

Hi all I'm working on masks (prewitt, sobel, mean, etc) with the CImg library. Right now I can apply masks quite well, and I have a question about the next "natural" step. If I want to apply two masks consecutively, let's say mean and prewitt-x, deffined as: mean: 1/9, 1/9... 1/9 prewitt-x: 1,1,1|0,0,0|-1,-1,-1 then I have to apply first the mean mask to my initial image, img , resu...


Saturation and Intensity Stretching

Started by ac.a...@gmail.com in Image Signal Processing10 years ago

Hello, I am performing a project to enhance underwater images. Predominantly in such pictures, the blue color seems to envelop the image. I...

Hello, I am performing a project to enhance underwater images. Predominantly in such pictures, the blue color seems to envelop the image. I have referred a few texts and found out that once i convert the image from rgb to hsi, i ll need to perform intensity and saturation stretching to enhance the true color of the image.. unfortunately for me, i am unable to avail any texts on the same subj...


gaussian filtering

Started by marc...@gmail.com in Image Signal Processing10 years ago 1 reply

Hello forum, question about gaussian kernel. take an image 512x512. Does the gaussian filter size (usually and odd size), depend on...

Hello forum, question about gaussian kernel. take an image 512x512. Does the gaussian filter size (usually and odd size), depend on the standard deviation of the filter? What I mean is: the discrete approximation to the kernel makes it go to zero after 3 sigmas. If the kernel is, say, 5x5 for sigma1. If we increase the sigma such that sigma2=2*sigma1, do I need to increase the size of...


Masking - decompose convolution

Started by kian...@live.co.uk in Image Signal Processing10 years ago 2 replies

Hi, my project for master Eng. involves image masking. it uses A mask of size 8x8. i wish to make the masking process faster(if possible)....

Hi, my project for master Eng. involves image masking. it uses A mask of size 8x8. i wish to make the masking process faster(if possible). with this mask I need 64 MAC per point. I tried thinking of FFT but it does not make the process less in my case. I then I though if it is possible to break down the mask as below: G(8x8)=original mask Ga=? (smaller than 8x8) Gb=? (smaller than 8x8) G...


FFTW usage on images

Started by rech...@consolidated.net in Image Signal Processing10 years ago

I'm new to using FFTw but have experience with other FFT routines. My questions about FFTw software are: In this call planForward =...

I'm new to using FFTw but have experience with other FFT routines. My questions about FFTw software are: In this call planForward = fftw_plan_dft_r2c_2d ( iyLeng, ixLeng, fftInFor, fftOutFor, FFTW_ESTIMATE ); can fftInFor and fftOutFor share memory as in an in-place transform. In previous ffts I've used, they returned normalized data. In fftw it looks like I must scale the forward by...


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