reconstructing image

Started by khalloud70 in comp.dsp11 years ago 8 replies

I have image 256*256 , i compressed it using the Block Processing 'block' to be 128*128, and i want to encode it by reed solomon . so i export...

I have image 256*256 , i compressed it using the Block Processing 'block' to be 128*128, and i want to encode it by reed solomon . so i export it to the workspace using yout block and encode it by rsenc as follows: p=gf(yout,8) code=rsenc(p,138,128) d=rsdec(code,138,128) and this works fine but i want now to reconstruct the image after it had been decoded as variables , d and code are o...


Holomorphing: 2D-image processing as 1D complex DSP!

Started by Anonymous in comp.dsp5 years ago

One word, alone says it all "Holomorphic functions". Here, it's just simple polynomial "curve"-fitting of an image verses a sample of points. It's...

One word, alone says it all "Holomorphic functions". Here, it's just simple polynomial "curve"-fitting of an image verses a sample of points. It's morphing without all the complicated machinery of Delaunay triangulation, meshes and so on. And it works quite well, if you don't ... er ... STRETCH it too far. Here's a demo. (Both the skirt and the face were morphed). https://twitter


How to create a 3D - three dimensional image in matlab.

Started by Aytach in comp.dsp12 years ago 4 replies

Hello to everyone; i need to learn something for my project. I have a dicom file which includes 480 seperate images of brain tissue. what i want...

Hello to everyone; i need to learn something for my project. I have a dicom file which includes 480 seperate images of brain tissue. what i want to do is to create a 3D image from this seperate images. So any helps about where can i start? Thanks for your attention...


60 GHZ uncompressed transmission

Started by fawzy in comp.dsp10 years ago 9 replies

Dear Sir; A new technique in a multimedia transmission is transmitting a video without compression on 60 GHZ unlicensed band. It uses image...

Dear Sir; A new technique in a multimedia transmission is transmitting a video without compression on 60 GHZ unlicensed band. It uses image partitioning. I need some information about this image partitioning. Regards Eng. Fawzy


non linear quantization

Started by mousecatz in comp.dsp12 years ago

Hi there! Can anyone help or give reference about this problem: what quantification scheme will be used and how will it be implemented when...

Hi there! Can anyone help or give reference about this problem: what quantification scheme will be used and how will it be implemented when i try to render an image in a cellphone screen considering a certain correction intensity of a square function f(x)=255*sqrt(x/255) and x ranging from 0 to 255 which represents image intensity? i really do appreciate any input. thanks much, mous...


Analytical function for entropy and its derivative

Started by Sylvia in comp.dsp10 years ago 3 replies

Hello, I want to have the analytical continous form of entropy (for an image X) and its derivative (at each location in image X) that can be...

Hello, I want to have the analytical continous form of entropy (for an image X) and its derivative (at each location in image X) that can be directly implemented. Is there any good reference for this? Thanks Sylvia


DSP for Image scaling / Maniupation in Real Time

Started by nap in comp.dsp14 years ago 7 replies

Hello.. I have been lurking a little here for the last few months and let me say that I am completely overwhelmed with the capablities...

Hello.. I have been lurking a little here for the last few months and let me say that I am completely overwhelmed with the capablities and knowledge of people in this NG. I am an engineering company that provides various services , including embedded development, for lots of nifty gadgets. I may need to build an image scaler which can do some format conversion in real time for a d...


Difference of Gaussian

Started by Anonymous in comp.dsp13 years ago 2 replies

Hi all, I've to implement(C++) and compare some object recognition schemes( like SIFT, G-RIF etc based on local feature extraction), and I...

Hi all, I've to implement(C++) and compare some object recognition schemes( like SIFT, G-RIF etc based on local feature extraction), and I come across the term "difference of gaussians" or "DoG" for images, which supposedly extract radially symmetric features from the image. My question is: -- how exactly is this "DoG" calculated over an image? Also, if anyone is familiar, is there an...


image enhancement through dynamic range compression and contrast enhancement

Started by 4N in comp.dsp12 years ago

Hi, I've read in my old textbook that using omomorphic filtering + a slightly modified gaussian highpass filter I can enhance the visibility...

Hi, I've read in my old textbook that using omomorphic filtering + a slightly modified gaussian highpass filter I can enhance the visibility of images, but when I tryed I simply obtained a darker image, which makes sense since the dc is the value reduced the most. Does someone know how this filter works? Thanks.


Problem with image deconvolution

Started by Tduell in comp.dsp8 years ago 1 reply

Hullo All, I recently posted to this group on this question but I never saw it appear, so please excuse my posting again. I have two...

Hullo All, I recently posted to this group on this question but I never saw it appear, so please excuse my posting again. I have two overlapping images (apprx. 30% overlap) which are part of a series to be stitched into a panorama. One image is blurred by motion blur, the other is sharp. As I effectively have the blurred and the 'latent' images it seemed like there was a fair chance I could...


Characteristics of FFT of positive functions?

Started by Chris Bore in comp.dsp14 years ago 1 reply

Image data is all positive. So the FT of an image has a large DC component. But, are there other characteristic properties of an...

Image data is all positive. So the FT of an image has a large DC component. But, are there other characteristic properties of an all-positive function? Similar, for example to the 'real-is-even' etc? Chris =========================== Chris Bore BORES Signal Processing www.bores.com


image compression

Started by gilbert in comp.dsp16 years ago 1 reply

This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C3A310.F0A4C400 Content-Type:...

This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C3A310.F0A4C400 Content-Type: text/plain; charset="big5" Content-Transfer-Encoding: quoted-printable hi,=20 I have a Cmos sensor (image sensor ), it has RGB output form. i want to compress those data, but i do not know how should i do. Is there anybody can tell me where can find these references? Gil...


urgently ........how to read an image in C5000 (code composer simulator)?

Started by B.yasmine in comp.dsp15 years ago 2 replies

hello all, please help me : is it possible to read an image with (200x200) pixels ?? when i build my program the error message is: error:...

hello all, please help me : is it possible to read an image with (200x200) pixels ?? when i build my program the error message is: error: can't allocate '.bss' so how to change the commnade file (.cmd) for read a big pixels matrix ?!!!


Code for I/Q mismatch calibration

Started by Peter Mairhofer in comp.dsp3 years ago 28 replies

Hi, Does anyone have some code for I/Q mismatch calibration/compensation for a direct conversion receiver which I may use? So far I used a...

Hi, Does anyone have some code for I/Q mismatch calibration/compensation for a direct conversion receiver which I may use? So far I used a spectrum analyzer as capturing device which can do I/Q calibration automatically ... but now I use an RF board and I have an image at -30dBc ... and NMSE=-30 dB only. I was told I should just filter out the image but this makes it even worse. I don...


Understanding modern TxDAC's?

Started by MM in comp.dsp16 years ago 5 replies

Hi all, Let's say I want to synthesize a 40 MHz wide transmit band centered at 70 MHz, from a baseband sampled at 100 MHz. I played with an...

Hi all, Let's say I want to synthesize a 40 MHz wide transmit band centered at 70 MHz, from a baseband sampled at 100 MHz. I played with an AD9772 DAC and found that I can do it in the Direct IF mode if I use the first image (Fs-Fin), but the problem is that the second image (Fs+Fin) is too close for me to be able to filter it out efficiently by traditional means . One way of dealing with ...


2D Convolution using FFTW

Started by Swati in comp.dsp14 years ago 1 reply

Hello everyone, I am implementing a fast convolution program using FFTW library. I understand the constraints of the Discrete Convolution...

Hello everyone, I am implementing a fast convolution program using FFTW library. I understand the constraints of the Discrete Convolution Theorem, and the issues of wrap around error and periodicity. Hence, I am taking the following approach at the moment. /*-------------------*/ Image: image[sizeX][sizeY] (Symmetrical)Filter: kernel[2k + 1][2k + 1] Step(1) Define padX = siz...


I uncover the secret of visual consciousness

Started by Anonymous in comp.dsp12 years ago

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,


image correlation and autocorrelation

Started by fisico30 in comp.dsp10 years ago 2 replies

Hello forum, this is a simple one: I found two forms of autocorrelation for 1D signals: biased and unbiased. Does anyone know the...

Hello forum, this is a simple one: I found two forms of autocorrelation for 1D signals: biased and unbiased. Does anyone know the difference? Also, all the signals or images we work with are finite in length. If autocorrelation is carried out, we need to shift the image around with respect to itself.......( that would correspond to the lag (shift) in space). In order to do that, do we...


Mean Shift procedure for finding local maxima in a Gray Scale image

Started by Nadav in comp.dsp8 years ago 2 replies

Hi, I am considering usage of the Mean-Shift algorithm to classify local maxima in gray scale image ( result of Hough Transform for lines...

Hi, I am considering usage of the Mean-Shift algorithm to classify local maxima in gray scale image ( result of Hough Transform for lines ). For mean calculation I use the center of mass formula ( having Luma as the mass ). The mean shift procedure: 1. Define a radius, e.g. 6 2. For each 12x12 box in the image a. Calculate the center of mass b. Shift the 12x12 box center to the re...


Deconvolution Algorithm

Started by satish_sac in comp.dsp12 years ago 4 replies

Hi, I am looking for an Deconvolution algorithm to restore an image by deconvolution of image data and its known/modeled PSF. Which algorithm...

Hi, I am looking for an Deconvolution algorithm to restore an image by deconvolution of image data and its known/modeled PSF. Which algorithm is best suited for this? Is it available on the net. Regards, Satish