**Image Negation:**

The negative point transformation
function also known as contrast
reverse. The negative transformation is used to make the output more
suitable for the task at hand (e.g., by making it easier to notice interesting
details in the image).

Where‘s’
is Output image after transformation

L-1
is Maximum Pixel value

Fig: Negative Image Transformation

This kind of transformation used for
finding details in X-ray Images. It will gives white details in black area and
black details in white area.

**Histogram Equalization:**

Histogram equalization is a technique by
which the gray-level distribution of an image is changed in such a way as to
obtain a uniform (flat) resulting histogram, in which the percentage of pixels
of every gray level is the same. To perform histogram equalization, it is
necessary to use an auxiliary function, called the transformation function,

*T*(*r*). Such transformation function must satisfy two criteria
1.

*T*(*r*) must be a monotonically increasing function in the interval 0 ≤*r*≤*L*− 1.
2. 0 ≤

*T*(*r*) ≤*L*− 1 for 0 ≤*r*≤*L*− 1.
The most usual transformation function
is the cumulative distribution
function

(cdf) of
the original probability mass function, given by

where sk

*is the new (mapped) gray level for all pixels whose original gray level used to be rk.*
Histogram equalization is used for increasing
contrast of an image. This can be achieved by using histogram stretching
operation

**.****Implementation of both Techniques in MATLAB:**

Following figure shows you MATLAB implementation of Image Negation and Histogram Equalization method

**Download Respective Published paper on Histogram Equalization and Image Negation:**

http://www.2shared.com/document/_QRc4HqD/DH33653657.html

**Download Matlab Code for Image Negation and Histogram equalization from following link:**

http://www.2shared.com/file/mmRU4HBD/Matlab_code_for_Hist_and_Nega.html

**Download Video from following link, it will gives you idea about how to RUN that matlab code**:

http://www.2shared.com/video/gXfhBObg/equilization_and_negative_of_i.html

**Video of the above MATLAB Implementation is as follows:**

Note: Play only in windows media player...

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