## Entropy of an Image in MATLAB

Started by in Image Signal Processing14 years ago 1 reply

Hello, I have just taken up a project on Medical Image data compression and as a start i wanted to find entropy of an image in MATLAB...I have...

Hello, I have just taken up a project on Medical Image data compression and as a start i wanted to find entropy of an image in MATLAB...I have calculated dimensions of the image, ie the matrix size, but am unable to get the loop structure to find entropy of the rows and columns..using probability formula.. Can someone help me out? Thanks!

## frequency features in pattern recognitin problem

Started by in Image Signal Processing14 years ago 1 reply

Can anybody help me in understanding clearly how frequency related features are extracted from an image which are later used for pattern...

Can anybody help me in understanding clearly how frequency related features are extracted from an image which are later used for pattern recognition?

## how to classify the image feature extraction methods

Started by in Image Signal Processing14 years ago

hi to all of the researcher and who love researching I'm trying to classify all of the image extraction method's in one big tree. how we can put...

hi to all of the researcher and who love researching I'm trying to classify all of the image extraction method's in one big tree. how we can put the following features extraction methods in this classification: * PCA principle component * DCT discrete cosine transform * FFT fast fourier transform * DWT discret wave let transform * statistical model ( variance , covaria...

## PSNR

Started by in Image Signal Processing14 years ago 1 reply

Hi, I have two square matrices of different sizes. One is half the size of the other. I got this from db1 wavelet decomposition. Now I want to...

Hi, I have two square matrices of different sizes. One is half the size of the other. I got this from db1 wavelet decomposition. Now I want to compute PSNR (peak signal...) between these two. Please suggest how to go about. Thanx Abdulla

## Image quality measure without having the original image?

Started by in Image Signal Processing14 years ago 4 replies

Hello everybody, I need a resource or information on how to measure the quality of a reconstructed image without having the original...

Hello everybody, I need a resource or information on how to measure the quality of a reconstructed image without having the original image. Here is the set up(wireless multimedia sensors): I have an algorithm to compress the image(encoder, image sensors) and send it to the base station for processing. But after decoding i need to measure the quality of the reconstructed image and give feedb...

## Internal Structure of an MPEG Frame

Started by in Image Signal Processing14 years ago 1 reply

Hi, I want to know the internal structure of an MPEG frame.I am doing my project on "motion detection in the compressed domain".So my first step...

Hi, I want to know the internal structure of an MPEG frame.I am doing my project on "motion detection in the compressed domain".So my first step of the project is to parse the MPEG video and get the header information.I was able to get the frames(Like which is the I frame or B frame).But as I don't know the internal structure of the frame,I am not able to proceed further.So please provide me with...

## Test images for iamge rectification

Started by in Image Signal Processing14 years ago

Hi all I'm working on an application that rectifies images by means of the direct linear transform (dlt). Right now, my application works...

Hi all I'm working on an application that rectifies images by means of the direct linear transform (dlt). Right now, my application works with some of my images, but in other cases the resulting image is a nonsense. As in the rectification process the data are subjected to measurement and human error, Im not sure either my application isn't working properly or my data are wrong. Tha...

## How to detection similarity of two Image

Started by in Image Signal Processing14 years ago 8 replies

dear all members I am trying to find rate of difference or rate of similarity of two Images. anyone can give me any Idea ? for example : if...

dear all members I am trying to find rate of difference or rate of similarity of two Images. anyone can give me any Idea ? for example : if we have 2 Image : im1.jpg and im2.jpg ---------------------------------- f1=imread('im1.jpg'); f2=imread('im2.jpg'); F1=fft2(f1); F2=ff2(f2); similarity(f1,f2)=? ------------------------------- How can I compare this two Fouriers? How can I find ...

Started by in Image Signal Processing15 years ago 2 replies

Hi I am new to image processing using embedded systems i am starting with code composer studio 4.0 simulation on target C64X i want to know...

Hi I am new to image processing using embedded systems i am starting with code composer studio 4.0 simulation on target C64X i want to know if there are API for reading bmp / jpg images in code composer studio from the ( OR simillar to CxImage libraries used in windows visual studio) . or Images are read using fopen and removing the headers manually (bmp and raw images) can someone ...

## Horizontal Edge detection using Canny

Started by in Image Signal Processing15 years ago 1 reply

Hi all: I want to use the Canny edge detector for detecting horizontal edges/lines only. Is it possible to do that? Which are the most...

Hi all: I want to use the Canny edge detector for detecting horizontal edges/lines only. Is it possible to do that? Which are the most important tuning parameters to make it work best for this purpose? I want it to work consistently well for all the images. My questions may sound too easy, but I'm an audio/speech processing guy :-) Best Regards, ~Arijit