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shimul


Active since 2013

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Professional Interests: image processing

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How to add 10dB or 30 dB noise to an image?
I want to add noises in an image so that the resulting PSNR becomes 10dB or 30 dB? How can I add noise of specified PSNR to a...

mer än 11 år ago | 1 answer | 0

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answer

Question


How can I estimate the variance of noise of an given image?
An input image is given, I am supposed to estimate the variance of noise of that image.

mer än 11 år ago | 1 answer | 0

1

answer

Question


How to apply adaptive soft threshold denoising on an image?
I want the code matlab code to do the following 1. Calculate the DWT of the image. 2. Threshold the wavelet coefficients.(Th...

mer än 11 år ago | 0 answers | 0

0

answers

Question


How can I reconstruct a color image to get its original version using wavelet?
Wavelet is considered to be completely invertible. That is if an image is decomposed using wavelet. then the image can be get ba...

mer än 11 år ago | 0 answers | 0

0

answers

Question


How to find the intensity of each pixel of an image?
Consider an image sample.jpg Now I want to count the number of pixels on that image have intensity value larger than 200(white ...

mer än 11 år ago | 2 answers | 0

2

answers

Question


how to find the width of edges in matlab?
I am able to find the edges of an image using sobel or canny filter. But I cant calculate the width of the edges. Actually I ...

mer än 11 år ago | 1 answer | 0

1

answer

Question


how to replace the center pixel of a 3X3 window with the min difference among its surronding pixels in matlab?
I want to replace the center pixel of a 3x3 window filter with the minimum difference among its surrounding pixels. I want to ...

mer än 11 år ago | 2 answers | 0

2

answers

Question


Anyone please explain how wavelet decomposition works (in case of image). And the concept of coefficient images .
Anyone please explain how wavelet decomposition works (in case of image). And the concept of coefficient images .

mer än 11 år ago | 0 answers | 0

0

answers

Question


I am applying dtw2 to an image (512*512)and after level 1 decomposition, I am getting approximation(256*256) and other details as coefficient images. How can I obtains actual images rather the coefficient images?
I am applying dtw2 to an image (512*512)and after level 1 decomposition, I am getting approximation(256*256) and other details a...

mer än 11 år ago | 0 answers | 0

0

answers

Question


How to construct image representation after applying low pass and high filter along the coloum using the dwt2 and before performing downsampling?
I am applying a discrete wavelet transformation on an image(suppose of size512*512) . according to the theory first the low ...

mer än 11 år ago | 0 answers | 0

0

answers

Question


I am applying dtw2 to an image (512*512)and after level 1 decomposition, I am getting approximation(256*256) and other details. How can I scale up only the 256*256 approximation to 512*512 size?
I am applying a discrete wavelet transformation on an image(suppose of size512*512) . Then I am getting 4 subband images after l...

mer än 11 år ago | 0 answers | 0

0

answers