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Data transfer

Started by jayadevan in comp.dsp18 years ago 1 reply

hi I am a student frm india. I am doing a project of implementing image processing algorithm in CCS.the hardware which i am working is...

hi I am a student frm india. I am doing a project of implementing image processing algorithm in CCS.the hardware which i am working is DSK6711. the first task which i had to do was to transfer the image into the SDRAM of the h/w. The code is: #include #include main() { unsigned char *red,*green,*blue; int i; FILE *fp; red=(unsigned char*)0X80001000; green=(un


optimizing image processing - control statement in loop prevents sw pipelining

Started by maikeru in comp.dsp19 years ago 6 replies

hi, I got a problem w/ optimizing a loop. I use the TMS320C6414 DSP. It is an image processing algorithm and the loop contains a control...

hi, I got a problem w/ optimizing a loop. I use the TMS320C6414 DSP. It is an image processing algorithm and the loop contains a control statement (if), therefore sw pipelining is not possible. The if statements checks the lower and upper margines for the intensity of each pixel. Here is a pseudo code snippet: for(i = 0; i < scr_mfs-> m_nRoiHeight; i++) { [...] for(j = 0; j < scr


Watermarking Using Chaotic Modulation

Started by mashar786 in comp.dsp15 years ago 1 reply

I am doing a project to implement ZERO WATERMARKING (Instead of embedding an external watermark, the zero-watermarking technique extracts...

I am doing a project to implement ZERO WATERMARKING (Instead of embedding an external watermark, the zero-watermarking technique extracts some essential characteristics from the host image and uses them for watermark embedding and extraction). Now for this purpose i am using CHAOTIC MODULATION. In short the steps involved for CHAOTIC MODULATION will be, 1. The original image has been coded i...


Stereograph for the centre of Milky Way

Started by tontoko in comp.dsp17 years ago

In the following website; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=3494 the image shown is the stereograph for...

In the following website; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=3494 the image shown is the stereograph for the centre of Milky Way synthesized by Stereographer (original image: Chandra X-ray satellite). For detail of Stereographer, visit; http://139.134.5.123/tiddler2/stereographer/stereograph.htm


DCT reference software

Started by daisy21 in comp.dsp17 years ago 2 replies

Hi, Does anyone know of any reference software to perform a DCT on an image? Does the image have to be in a certain format? Thanks!

Hi, Does anyone know of any reference software to perform a DCT on an image? Does the image have to be in a certain format? Thanks!


Unmasked Tempel 1

Started by tontoko in comp.dsp17 years ago 26 replies

In the following URL; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=1866 the left side is the original image of...

In the following URL; http://www.unmannedspaceflight.com/index.php?act=Attach&type=post&id=1866 the left side is the original image of Tempel 1 taken by Deep Impact probe and the right side is the processed image deconvoluted by Focus Corrector. For detail of Focus Corrector, visit; http://139.134.5.123/tiddler2/c22508/focus.htm


help : Analyzing MRI raw data

Started by Jefferson O. Siy in comp.dsp20 years ago 2 replies

I got an MRI raw data. Now how do I convert it to an MRI image? These are the current steps that I follow : 1. translation of data to R =...

I got an MRI raw data. Now how do I convert it to an MRI image? These are the current steps that I follow : 1. translation of data to R = input[i]*Cos((2*pi*f)*n/N) I = input[i]*Sin((2*pi*f)*n/N) 2. Zero pad the R and I data to reach data size allowable for FFT 3. perform a Horizontal then a Vertical FFT 4. get the absolute value of R and I Unfortunately, all I get is NO Image. ...


Wavelets

Started by Anonymous in comp.dsp16 years ago 2 replies

Dear ALL!! Suppose, I have image (256x256): img = im2double(imread('lena.bmp')); Then I perform discrete wavelet transform and get 4...

Dear ALL!! Suppose, I have image (256x256): img = im2double(imread('lena.bmp')); Then I perform discrete wavelet transform and get 4 components of source image: [a, h, v, d] = dwt2(img, 'db1'); Then I reconstruct signal using only detail components: det = idwt2([], h, v, d, 'db1'); Next I downsample det with 3/4, i.e. get det2 with size 192x192: det2 = downsample(det, 3/4); - n...


2D FFT cross correlation problem

Started by Anonymous in comp.dsp17 years ago 4 replies

I'm doing 2D image cross correlation on the c6400 TI DSP. I'm using the FFT functions in the DSP library to do this. I high pass filter...

I'm doing 2D image cross correlation on the c6400 TI DSP. I'm using the FFT functions in the DSP library to do this. I high pass filter my images before correlating them using a 3x3 convolution mask. The result seems to be correct giving a target peak in the correct position but there is always an erroneous peak at the very centre which does not change. Here's an image of the correlation plan...


Auto Focuss lense/ CCTV with builtin autofocus function

Started by ymbhinder in comp.dsp17 years ago 2 replies

The issue is, that one of our client is using Pulnix CCTV Camera( Product No. TMC-63.) They are currently using 12mm, CS mount lense. They have...

The issue is, that one of our client is using Pulnix CCTV Camera( Product No. TMC-63.) They are currently using 12mm, CS mount lense. They have to instal camera behind a glass wall. When they change the position of camera the difference in thickness of glass makes the image blur. So they are actully looking any lense which adjusts it's position automatically to make the image clear. Is the...


when to use "conv2", when to use "fft"->"multiplication"->"ifft"?

Started by lucy in comp.dsp19 years ago 2 replies

Hi all, I am doing 2D image filtering with sometimes filter size larger than image size. I am wondering which of the following scheme is...

Hi all, I am doing 2D image filtering with sometimes filter size larger than image size. I am wondering which of the following scheme is the fastest, using Matlab: 1) conv2, 2D convolution directly; 2) conv2, but decompose the filter into two separable filters and then conv2 will first convolve along X axis and then convolve along Y axis; 3) fft2, multiplication, ifft2, all in 2D do...


Symposium "Computational Methods in Image Analysis" within the USNCCM IX Congress - Submission ENDS in 5 days

Started by tava...@fe.up.pt in comp.dsp17 years ago

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---------------------------------------------------------------------------= ---------------------------------------------------------------- (Apologies for cross-posting) Symposium "Computational Methods in Image Analysis" National Congress on Computational Mechanics (USNCCM IX) San Francisco, CA, USA, July 22 - 26 2007 http://www.me.berkeley.edu/compmat/USACM/main.html We would appr...


help needed to implement multiple wavelet denoising

Started by job in comp.dsp16 years ago

The function for denoising in my code is function output = SureDenoise(input,wtype,sigma) here only one orthonormal wavelet called sym8 is...

The function for denoising in my code is function output = SureDenoise(input,wtype,sigma) here only one orthonormal wavelet called sym8 is used and the function for decomposition is WT = WaveDecompo(input,wtype,J) here input is the noisy image and J is the number of scales.While decomposing the image is decomposed into lowpass and highpass subbands.The denoising is done only the highpas...


ROI-based image watermarking with DWT

Started by محمد احمد in comp.dsp11 years ago 1 reply

hi everybody, i am working on a project on digital watermark for image based on IRO (region of interest). the first step in this project is to...

hi everybody, i am working on a project on digital watermark for image based on IRO (region of interest). the first step in this project is to separate ROI using roipoly or imfreehand or any other interactively way, and then considering RONI(reigon of non interest) and applying 3 level DWT using "Haar" wevelt. WHERE only RONI will be used for watermark embedding. please if any on


wavelet based method for removing Gaussian Noise

Started by A.E lover in comp.dsp17 years ago

Dearl all: Hi all, I need to use wavelet based method to remove Gaussian white noise on an image. I have some confusion and would like to ask...

Dearl all: Hi all, I need to use wavelet based method to remove Gaussian white noise on an image. I have some confusion and would like to ask you: 1. What wavelet basis I should choose for decomposing the image? I intend to use Haar , DB2, db3, db4 to test the SNR to see what is the best. However I am considering for Gaussian Noise, if there are some best wavelet bases for this task, if...


Weaver Image Rejection, are only images in band cancelled?

Started by Anonymous in comp.dsp16 years ago 12 replies

Hi I'm implementing a Weaver image rejection filter for a digital comms system, but I've run into a problem which I can't resolve,...

Hi I'm implementing a Weaver image rejection filter for a digital comms system, but I've run into a problem which I can't resolve, either conceptually or in my MATLAB simulation. First, my understanding: RF ---- 1/ We receive a signal with a centre frequency of f_c occupying a band (f_c - B) to (f_c + B) 2/ We quadrature demix using an LO of frequency (f_c - B) so that the signal o...


how to apply 2D FIR filter to an image using MATLAB?

Started by fulltime in comp.dsp17 years ago 2 replies

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab...

Hi all, I have used remez function to design a 1D FIR filter and converted it to a 2D FIR filter using ftrans2. However, wat commands in matlab can i use to apply this 2D FIR filter to my image? thks..


Error in input of integer RS encoder

Started by khalloud70 in comp.dsp16 years ago 1 reply

I am using simulink model I am importing an image 256*256 from workspace, then to Block processing box, to compress it , o/p of block is...

I am using simulink model I am importing an image 256*256 from workspace, then to Block processing box, to compress it , o/p of block is 128*128 image , then convert it from 2-d to 1-d using the conversion box then o/p is [16384*1] ,then to frame conversion box,then to RS Encoder . i used 64 for message and 74 for code word length when i connect o/p of RS Encoder to the i/p of RS Decoder , ...


Split complex vectors and AltiVec FFT's

Started by Eric Raas in comp.dsp21 years ago 4 replies

Hi - I am trying to use Apple's AltiVec FFT routine fft2d_zrip in a scheme for doing 2D sinc interpolation by zero-padding the 2D DFT of an...

Hi - I am trying to use Apple's AltiVec FFT routine fft2d_zrip in a scheme for doing 2D sinc interpolation by zero-padding the 2D DFT of an image. I am able to do forward and reverse 2D FFT's and recover the original image, but when I zero pad I get clearly wrong results. The FFT routine in question makes use of what Apple calls a "split complex vector" format, which is a reordering...


Superhet receiver and image frequency

Started by Maurizio in comp.dsp15 years ago 3 replies

I'd like to ask some question about superhet receiver and related problem of image frequency. Suppose that receiver is composed by following...

I'd like to ask some question about superhet receiver and related problem of image frequency. Suppose that receiver is composed by following schema: [s(t)] ---> [Circuit RF] ---> [MIXER] ---> [IF] s(t) is input signal eg. DSB-SC modulated, having bandwidth of BT and carrier frequency fc. Here I'd like to know why the RF circuit cannot filter the s(t) signal using bandwidth of BT, in