## Forums Search for: Image

## WSQ image library for Texas Instruments family microprocessors released

inCognaxon 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...

## what are the training algorithm you guys are using for adpative filtering for image processing?

inDear all, I have a question about adaptive filtering for image enhancement. I want to design an algorithm for image enchancement. It should...

Dear all, I have a question about adaptive filtering for image enhancement. I want to design an algorithm for image enchancement. It should work on most of images. So I need to make it adaptive. I guess what I need is to extract some features from different images. I did extract the largest eigenvalue of the covariance matrix of the input images. I use this eigenvalue as "x". Then I...

## image out-of-focus blur identification

inHi there, Suppose an image is out-of-focus blurred. We have the original image and its blurred version. What is the best approach to estimate...

Hi there, Suppose an image is out-of-focus blurred. We have the original image and its blurred version. What is the best approach to estimate the blur function? That is, given y(m), x(m), how to we estimate the point spread function (or impulse response function) h(m): y(m) = h(m)*x(m) + n(m) where n(m) is some kind of background noise. We are expecting to use some kind of minimized...

## inversie filtering?

inDear all, I have an image and had been processed by a certain filter(I sort of can guess the filter out) how can I inverse that process and...

Dear all, I have an image and had been processed by a certain filter(I sort of can guess the filter out) how can I inverse that process and restore the original image? Thanks a lot, Michael.

## Idea exploration 1.1 - Inertia based angular sensor.

inThis idea is used to serve my old idea of "Image stabilization by means of software.". I was aware that it was difficult to find angular sensor...

This idea is used to serve my old idea of "Image stabilization by means of software.". I was aware that it was difficult to find angular sensor that can run at 1MS/s. I will have a cubic enclosure, two perpendicular walls are made of small/fast image sensors. I use a hanging ball and a laser to shine upon it. The image sensors will detect the exact location of the ball (hopefully 1000 time...

## Online lecture series on Digital Image Processing?

Hi, I have been searching for a lecture series on Digital image Processing. Not just a set of lecture notes, but a classroom lecture series....

Hi, I have been searching for a lecture series on Digital image Processing. Not just a set of lecture notes, but a classroom lecture series. I am sure that there is some university somewhere that has recorded a course on Image Processing. Thank You Tom tom_cip_11551@hotmail.com

## Image processing systems

inI need a image processing system to perform various autonomous machine vision applications. A PC (or Laptop) is one alternative but I...

I need a image processing system to perform various autonomous machine vision applications. A PC (or Laptop) is one alternative but I was wondering what else is available. As it's a research project cost is an issue.

## EPPI Sychronization problem on BF548 EZ-kit

inHi all, I am doing a video project,using BF548EZ-Kit and OV7620 image sensor. The sensor is connected directly to the borad via EPPI1...

Hi all, I am doing a video project,using BF548EZ-Kit and OV7620 image sensor. The sensor is connected directly to the borad via EPPI1 interface. For testing, a single frame can be captured after setting up the DMA13 and EPPI1 configuration. I use image viewer to display a image with a start address that I specified in the DMA start address. The problem is every time I got a frame, it seems ...

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

inHello, 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 ...

## Image compression MCU/DSP

inHello 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 ...

## how to reppresent image data structure in physical units? how to do convolution for physical world models?

inHi 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 ...

## which should have higher entropy?

I made a similar post sci.image.processing a while back. I'm trying to understand why a my natural images are higher entropy than...

I made a similar post sci.image.processing a while back. I'm trying to understand why a my natural images are higher entropy than uniform noise. The order from lowest to highest is constant (0 obviously), uniform noise, LPF'd image, same image not LPF'd, gaussian noise My theoretical calculation for uniform noise agrees with what I'm getting -- about 1/256*log2(256)*241^2. Now there a...

## please recomend algorithm for image surface interpolation?

inDear 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? ...

## need advice on image filter?

inHi 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...

## Postdoc position in Image and Waveform Compression

Postdoc position in Image and Waveform Compression A postdoc position is available immediately at Schlumberger- Doll Research in Cambridge,...

Postdoc position in Image and Waveform Compression A postdoc position is available immediately at Schlumberger- Doll Research in Cambridge, Massachusetts. We are looking for a strong PhD graduate for research work in the area of compression of images and waveforms. Experience in image and waveform compression is mandatory, and knowledge of estimation and detection theory is desirable....

## Is octave good to do image processing?

inHello All, I found octave to be good for signal processing applications. But is octave good for doing image processing too? The...

Hello All, I found octave to be good for signal processing applications. But is octave good for doing image processing too? The reason why I am asking this, is sometimes back I was using scilab for image processing applications. when I ventured more in depth I found it to be dead slow for processing large amounts of data, and specially if there were any ...

## Image Processing and Human Perception of Distortion

inI 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,...

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

inHi, 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 ...

## OT: Lunar Eclipse Pic

inHello Guys, We had another one, so here is a link to see an image I took...

Hello Guys, We had another one, so here is a link to see an image I took during totality: http://www.claysturner.com/eclipse/lunareclipse.jpg feedback welcome. We can even pull this on topic by discussing drizzle techniques for image processing. Clay

## radial/circular average of 2D FFT

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...