VC++ source code for image load/display

Started by KK in comp.dsp15 years ago 5 replies

Greetings, I am in need of source code which does the following I. Load/display grey/color image II. Extract the frames of a video and...

Greetings, I am in need of source code which does the following I. Load/display grey/color image II. Extract the frames of a video and allow me to do processing on them I have found some packages on sourceforge.net and codeproject.com which does the part I of my target. However, I find them extremely difficult to understand and make myself burdened with several functions/ features ...


FFT on a square wave

Started by Klaus Vestergaard Kragelund in comp.dsp16 years ago 1 reply

Hi I have an application where I'm using a functiongenerator and a scope to do network analysis. The function generator is programmed at...

Hi I have an application where I'm using a functiongenerator and a scope to do network analysis. The function generator is programmed at various sine frequencies and the scope captures an image per freq. and this image is download to the PC for analysis. For both A and B channel on the scope the magnitude and phase relationship is found and the gain is found by (A/B), the phase by A-B H...


Job opportunities for those with a passion for image processing

Started by Anonymous in comp.dsp13 years ago

My name is Barry Kahn and I'm the DSP R&D Manager for Silicon Optix. I am posting this message to invite talented engineers to join...

My name is Barry Kahn and I'm the DSP R&D Manager for Silicon Optix. I am posting this message to invite talented engineers to join our algorithm development team at the Teranex division in Orlando, Florida. More precisely, we are looking for engineers with a passion for image processing. Not only will you be developing cutting edge video applications, but you will get to host them on a SIM...


Name of this window

Started by Anonymous in comp.dsp15 years ago 15 replies

I've started using a simple windowing function to low pass filter a 2D image. Following the FFT, I multiply in the frequency domain with...

I've started using a simple windowing function to low pass filter a 2D image. Following the FFT, I multiply in the frequency domain with a function that increases with distance from the origin (allowing for wrapping). Then I IFFT back to the image domain. Basically the window is this: f = sqrt(alpha / (alpha + x^2 + y^2)) where x,y range from 1-n/2 to n/2 and alpha is a scalar. Anyone k...


how to retrieve image from google

Started by mari...@gmail.com in comp.dsp12 years ago 3 replies

Dear All, I am trying to get images from the google image search engine to my hard-disk. I managed to query the google through the following...

Dear All, I am trying to get images from the google image search engine to my hard-disk. I managed to query the google through the following in matlab. web(['http://images.google.com/images?q= mario ] What I need is to find a way /code in Matlab to download the images found to a directory on my harddisk for further processing. Is there anyone there that can help me out? I need it f...


TMS320C28x: Image with CSM password doesn't boot

Started by Anonymous in comp.dsp12 years ago 1 reply

Dear All, I've made an image, which when no password (0xFFFF's) on CSM are programmed, boots fine. But when a password is set in the CSM...

Dear All, I've made an image, which when no password (0xFFFF's) on CSM are programmed, boots fine. But when a password is set in the CSM it doesn't run. And because I can not use the debugger I have no idea what is happening. Who has a idea what could be causing this? Greetings Frank


Barrel Distortion correction algorithm

Started by Anonymous in comp.dsp12 years ago 7 replies

Hi..All, I have started to work on Image processing. I have used Cross- correlation to find the match between two images. Now, I want...

Hi..All, I have started to work on Image processing. I have used Cross- correlation to find the match between two images. Now, I want to remove barrel distortion from the sample image. But I don't know the algorithm to remove barrel distortion. Does any one have any idea of the same ? Thanks in advance..


image processing algorithm

Started by Edison_nel in comp.dsp13 years ago 3 replies

hi guys, what is actually image processing algorithm and how to describe it? regards.

hi guys, what is actually image processing algorithm and how to describe it? regards.


Weird results from FFTW -- banding and large roundoff

Started by Michael48 in comp.dsp13 years ago 11 replies

I have been struggling to figure out some strange results from FFTW. I get a angled banding in the DFT and the inverse gives an image that...

I have been struggling to figure out some strange results from FFTW. I get a angled banding in the DFT and the inverse gives an image that looks generally OK except that the signal varies periodically, consistent with those bands, by up to 1% above and below the original image signal. I have put some picture and description here: http://www.mirametrics.com/pub/fftw_strange_results.htm I hav...


Measuring the correct SNR for image in matlab

Started by bamerni in comp.dsp4 years ago 1 reply

Hello all, I am trying to add noise of 5dB to an image in matlab according to the following steps SNR = 5; Id = double(Io) / 255; v =...

Hello all, I am trying to add noise of 5dB to an image in matlab according to the following steps SNR = 5; Id = double(Io) / 255; v = var(Id(:)) / 10^(SNR/10); I_my_noisy = imnoise(Id, 'gaussian', 0, v); but when I measure the SNR by using the matlab command [peaksnr,snr] = psnr(I_my_noisy, Id) I get SNR equal 10. So, what is the wrong in my code? and why the result differ from...


Image Acquisition

Started by Mehta in comp.dsp13 years ago 1 reply

I am working on a project using the Image Acquisition Toolbox. I am trying to read frames from the input received on the tuner/capture card. The...

I am working on a project using the Image Acquisition Toolbox. I am trying to read frames from the input received on the tuner/capture card. The code that i am using goes likes this: obj = videoinput('winvideo'); start(obj); preview(obj); The trigger type by default is set at 'immediate' and number of frames to be acquired is 10. But, the problem is that the preview window shows the ...


Wiener filtering using mean-squared method: variance problem

Started by Anonymous in comp.dsp11 years ago

I am trying to implement a low pass Wiener filter using the mean- squared method, to provide elimination of noisy areas, background texture...

I am trying to implement a low pass Wiener filter using the mean- squared method, to provide elimination of noisy areas, background texture smoothing, and contrast enhancement. The algorithm I'm using is (to produce output image Q from input image P), to evaluate a 3x3 neighbourhood for each pixel, and Q(x,y) = mu + [ (sigmasquared - nusquared)/sigmasquared ] ( P (x,y) - mu ) Wher...


want to understand how Matlab handle image resolution/rate conversion?

Started by kiki in comp.dsp15 years ago 1 reply

Hi all, I read into the "imresize" Matlab function and want to understand how does these types of image transformation work... Here is the...

Hi all, I read into the "imresize" Matlab function and want to understand how does these types of image transformation work... Here is the code segment in "imresize"; it uses the "maketform" function. I also studied that "maketform" and attached the example as follows: Can anybody tell me what does "maketform('affine',[.5 0 0; .5 2 0; 0 0 1]);" mean? Especially what does [.5 0 0...


HELP URGENTLY for using DSP (TMS320C5000) simulator

Started by B.yasmine in comp.dsp15 years ago 3 replies

please help me it remains me just one month for present my final project !!!!! and i didn't find yet a solution to my problem!!! my subject is...

please help me it remains me just one month for present my final project !!!!! and i didn't find yet a solution to my problem!!! my subject is an implementation of optimal filter on DSP (image filter) and my problem is that when i introduce the input file (of my image) my output file is always empty (zero).....i think that my problem is what write in ADDRESS field of "probe point" or "load a...


About Notch Filtering in the Frequency Domain (2D images)

Started by Javier Montoya in comp.dsp12 years ago 2 replies

Dear all: I was studying the notch filter. As far as I understood, there are 2 possible ways to accomplish this task: 1) Set the DC component...

Dear all: I was studying the notch filter. As far as I understood, there are 2 possible ways to accomplish this task: 1) Set the DC component of the spectrum to be equal to zero, i.e: F(0,0) =0. To obtain the filtered image, apply the IDFT. 2) Create a kernel (k) having the same size as the filtered image. Set all the kernel values equal to 1, except for the pixel in position (M/ 2,N/2), ...


Normalizing coefficients of Gaussian derivative

Started by Anonymous in comp.dsp15 years ago 5 replies

I understand that the coefficients of discrete Gaussian is normalized before applying(as in the case of smothing),to preserve the dynamic range...

I understand that the coefficients of discrete Gaussian is normalized before applying(as in the case of smothing),to preserve the dynamic range of the input data.In this case,each coefficient is divided by the sum of the (unnormalized)coefficients. If we need the first derivative of a 1-D "image",the image is smoothened(to remove noise-typically Gaussian filter is used) and then forward/ b...


Matlab coding help

Started by bobby110uk in comp.dsp14 years ago

Hey guys I got a piece of code that uses a matrix 256 by 256. A set of x and y coordinates are given which can be seen on the image when the...

Hey guys I got a piece of code that uses a matrix 256 by 256. A set of x and y coordinates are given which can be seen on the image when the code is executed (code shown below). You will see in the image that the coordinates create 3 half circle. I want help with increasing the gap between these half circles maybe by using the radius. If possible in a loop so it does the increasing method step...


Modulation transfer function

Started by arun in comp.dsp12 years ago

Hi, I have a doubt regarding 1 other project. I have to get the modulation transfer function of an image (and the same image defocused)....

Hi, I have a doubt regarding 1 other project. I have to get the modulation transfer function of an image (and the same image defocused). The defocus is either induced by constructing a bessel filter (similar to airy functions, defocus created by unfocused thin lens). Even though I already designed the filter, I am currently using a webcam to get the defocus by altering the focus of the le...


Any one can help me in writing pseudo code for Run Length Coding in Image Processing

Started by Searcher in comp.dsp13 years ago

Please Can Any one help me to write pseudo code for run length code representation of an image each run encodes the row number and the start and...

Please Can Any one help me to write pseudo code for run length code representation of an image each run encodes the row number and the start and end pixel column of a run


Can the Image Processing Industry Be Entered Without A Specialized Degree?

Started by Space1999 in comp.dsp13 years ago 7 replies

Hi All I have a BEng in Electrical and a solid background in C++. I am very familiar with DSP theory from self-study only. I have familiarity...

Hi All I have a BEng in Electrical and a solid background in C++. I am very familiar with DSP theory from self-study only. I have familiarity good with MATLAB. Recently I bought Embedded Image Processing on the TMS320C6000=99 DSP. Soon I plan to buy the C6416 DSK development platform to practice the exercises involving MATLAB, Code Composer Studio, and C. The topics covered are advanced li...