I have a very fundamental question about image processing and distortion. Suppose that we have two images: I[i,j] and J[i,j], where "i"...

I have a very fundamental question about image processing and distortion. Suppose that we have two images: I[i,j] and J[i,j], where "i" ranges from 0 to 1919 and "j" ranges from 0 to 1199. Suppose that we create J[] from I[] by adding uniform white noise at each pixel of the image. Assume that each pixel is 24-bit RGB and that we add uniform white noise, independently, to the red plane,...

Dear all, I am curious about how CCD works to pick up images... more specifically, I wonder CCD camera can output more than just pixel...

Dear all, I am curious about how CCD works to pick up images... more specifically, I wonder CCD camera can output more than just pixel intensity information of an image? For example, I want to know the "variation" property of a block of an image, for example, a 8x8 block... roughly classified into "smooth" block and "non-smooth" block, two classes... I want to know if CCD can judge this ...

Dear all, I am facing with the following image/signal processing problem: In order to measure image local activity, I take variance....

Dear all, I am facing with the following image/signal processing problem: In order to measure image local activity, I take variance. But variance involves square operation, suppose I am working on NxN blocks, then the N^2 square will need a lot of computation, which is very costly in my current application. Is there any techniques of measuring local activity by way of lower complexity co...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do surface interpolation to reconstruct the missing pixels. Which surface interpolation algorithm can do this job best? I hope this surface interpolation approach will be a lot better than bilinear interpolation, or separable interpolation, am I right? ...

Dear all, I want to ask how to downsample an image and avoid aliasing? How to make sure that an downsampled image can be reconstructed...

Dear all, I want to ask how to downsample an image and avoid aliasing? How to make sure that an downsampled image can be reconstructed perfectly? I guess I am too acquainted with time as my x-axis, now when it comes to 2D spatial domain, I get perplexed... Can anybody give me some enlightenment? Thanks a lot, -Walala

Hi all, I encounter some "problem" while using polyphase filter for interpolation. I have implemented a 8 zero crossing with upsampling of...

Hi all, I encounter some "problem" while using polyphase filter for interpolation. I have implemented a 8 zero crossing with upsampling of L=32. The image I used are a simulated image with 4 sinc impulse response near the four corner. All pixels values are positive. While performing interpolation, such as for rotation operation, I found that some of the values return is negative? ...

Hi all, I want to represent image in physical world units. Basically, the image consists of some dots, circles, ellipses, lines, and...

Hi all, I want to represent image in physical world units. Basically, the image consists of some dots, circles, ellipses, lines, and rectangles, etc. But their units should be meters or inches used in the physical world, instead of pixels we often used in the computer world. Is there any data structure and functions (in Matlab) that can facilitate the representation and rendering of such ...

What is a good image algorithm that will convert a background of one color to another? One that will handle edge effects on the border between...

What is a good image algorithm that will convert a background of one color to another? One that will handle edge effects on the border between the background and the rest of the image? -- % Randy Yates % "With time with what you've learned, %% Fuquay-Varina, NC % they'll kiss the ground you walk %%% 919-577-9882 % upon." %%%%

Hi all, We used camera to do some imaging and got some raw image data, which are very noisy at the low signal end(where there should be some...

Hi all, We used camera to do some imaging and got some raw image data, which are very noisy at the low signal end(where there should be some low signal) or the dark end(where there should be no signal theoratically)... And there are some some spikes on both dark and bright regions. The bright parts of the image are also noisy... Please advise which type of filter can be best for den...

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!

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...

I uncover the secret of visual consciousness Proof of visual consciousness > From image formation by a plane mirror to the generation of...

I uncover the secret of visual consciousness Proof of visual consciousness > From image formation by a plane mirror to the generation of (human) visual consciousness image formation by a plane mirror , visual consciousness, transform, virtual image , overlap(superpose), dual identities, seeing an object How could an object become visible when observed by the eyes of the human beings,

The pictures shown in the following URL; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=2017 are the original image of...

The pictures shown in the following URL; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=2017 are the original image of Vesta (left), its de-convoluted image (middle / focus depth:=3.8, iteration:=8 / software: Focus Corrector ) and another de-convoluted image (right / focus depth:=4.3, iteration:=8 / software: Focus Corrector). For detail of Focus Corrector, visit...

Hi everybody! I don't know if my topics is really clear... In fact, lets say that 'I' is an image. I have the image of 'dI/dX' and...

Hi everybody! I don't know if my topics is really clear... In fact, lets say that 'I' is an image. I have the image of 'dI/dX' and 'dI/dY'. Is it possible to get the image 'I' from those slopes (using MATLAB)? I didn't find any topics related to this, hope I didn't miss it.

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: ...

Hello all, What would you experts do if you want to perform image compression (I am thinking jpeg), on a low power board? The data is...

Hello all, What would you experts do if you want to perform image compression (I am thinking jpeg), on a low power board? The data is captured from an image sensor and needs to be transmitted elsewhere. Would you use a MCU bundled with a DSP or would you use two separate MCU and DSP chips? I was thinking about using a PIC with nano watt technology along with a low power DSP from TI. Or ...

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.

Hi, I need to identify or find if a particular pattern( Actually it is hyperbola pattern) is present in an image. Infact, the shape of...

Hi, I need to identify or find if a particular pattern( Actually it is hyperbola pattern) is present in an image. Infact, the shape of the hyperbola can again vary as different shapes and sizes. What part of image processing is this related. Can anybody point me to certain topics and resources which will help me do this? Bye

Hi, I created an image in Matlab in the following way: I created 2 vectors that represent the image coordinates, and gave a value to...

Hi, I created an image in Matlab in the following way: I created 2 vectors that represent the image coordinates, and gave a value to each combination of the vectors. For example: a=[-0.4:0.02:0.4], b=a, image(y,x) is the value of a(y), b(x). Then I performed some operations that are like Fourier transform. I got new coordinates that were not equally spaced. So I made a grid, and interpolat...

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 ...