Wednesday, 18 December 2013

How to apply DWT (Discrete Wavelet Transform) to Image?


Discrete time wavelet transforms (DWT), which produces multi-scale image decomposition. By employing filtering and sub-sampling, a result in the form of the decomposition image (for classical dyadic approach) is produced, very effectively revealing data redundancy in several scales. A coding principle is then applied in order to compress the data. It superior to Fourier and DCT. It has Discrete Wavelet Transform (DWT) provides a multi resolution image representation and has become one of the most important tools in image analysis and coding over the last two decades.

Monday, 16 December 2013

MATLAB Implementation of Steganography (Simple Data Hiding Method).


AIM: Study & Implementation of Steganography (Simple Data Hiding Method).
THEORY:
Modern information hiding technology is an important branch of information security. The redundancy of digital media, as well as the characteristic of human visual system, makes it possible to hide messages. Information hiding technology used in covert communication is named as steganography. Steganography is the art and science of invisible communication. Three competing aspects, including capacity, security, and robustness, are usually considered in the designing of information hiding schemes.

How to write own function in Simulink?

Simulink is an environment for simulation and model-based design for dynamic and embedded systems. It provides an interactive graphical environment and a customizable set of block libraries that let you design, simulate, implement, and test a variety of time-varying systems, including communications, controls, signal processing, video processing, and image processing. 

Simulink offers: 

Friday, 13 December 2013

MATLAB Implementation of Face recognition with Principal Components Analysis (PCA).

Face recognition has been very important issue in computer vision and pattern recognition over the last several decades. One difficulty in face recognition is how to handle the variations in the expression, pose and illumination when only a limited number of training samples are available. In this assignment Principal Component Analysis (PCA) is proposed for facial expression detection. 

Friday, 6 December 2013

How to convert .m file to .p file?


.p file stands for protected file. Matlab provides us one facility i.e. conversion from .m to .p file. We can convert important functions from .m to protected files. Matlab has a standard encryption key using that key Matlab will convert .m to .p file. If we open that file with the help of notepad or WordPad then we can’t get anything from that file.

Thursday, 5 December 2013

How to call one GUI into other GUI in MATLAB?


Calling of one GUI into other is very important job when we design some critical software based applications. 
1. Create one main GUI window. It should contain two push buttons one for continuous signal and other for Discrete signal as shown in following figure.



How to convert .m file to .exe?


1. First write your own program. For example write any application using Graphical user Interface (GUI).
2. Now go to command prompt window and write this command mbuild -setup. After writing press enter. Then you will see the figure given below.

Tuesday, 3 December 2013

How to handle variable from one function to other function in MATLAB GUI?


Handling variable from one function to other function is also an important job. Instead of taking variables once again from user, anyone can use saved variables by handling them properly in function to function. This process will reduce code length in MATLAB.  

How to use List box in MATLAB GUI?


AIM: Study and Implementation of Toggle button, Radio button and Checkbox in MATLAB GUI. 
PROCEDURE:
1. For opening GUI tool simply type following command in command window.
>> guide
This command will open GUI toolbox.

Monday, 2 December 2013

How to use Toggle button, Radio button and Checkbox in MATLAB GUI?


AIM: Study and Implementation of Toggle button, Radio button and Checkbox in MATLAB GUI.
PROCEDURE:
1. For opening GUI tool simply type following command in command window.
>> guide
This command will open GUI toolbox.

How to apply DCT to Color Image & Grayscale Image in MATLAB?

AIM: Study and Implementation of Discrete Cosine Transform of given image.

THEORY:
Discrete Cosine Transform (DCT) has been an important achievement in the field of image compression. The DCT can be considered as a discrete time version of the Fourier Cosine series. The discrete cosine transforms (DCT) is a technique for converting a signal into elementary frequency components. The transformed array obtained through DCT is also of the size N x N, same as that of the original image block.