Image Filtering

The need for image filtering
  
To fill the need for image enhancement which arises when the quality of images 
taken with a camera is not acceptable, or when special effects are desired, a 
number of special filters are available to apply to the image.  From the viewpoint 
of using a poor quality IR camera with noisy images, the use of these filters 
makes it possible get some good quality and useful images. 

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All of our software has the option of applying a color palette to an image or working
with inverted or none-inverted grayscale images. 

3x3 and 5x5 Median Filters

This class of filter belongs to the class of edge preserving smoothing filters which are 
nonlinear filters. These filters smoothens the data while keeping the small and sharp details.

3x3 Averaging Filter

This averaging filter is used for smoothing of noise in images by performing uniform 3x3 
averaging filtering.  This filter also blurs edges, displaces boundaries and reduces contrast.

Laplacian Filters 

The Laplacian filter is used for detection of edges in an image.  It highlights areas in which 
intensity changes rapidly producing a picture of all the edges in an image.

Sobel Filters 

The Sobel filter finds particular usefulness in enhancing edges and edge detection. 

Sharpen Filters 

A Sharpen filter is used to focus blurry images by increasing the contrast of adjacent pixels. 

Blur Filter

Blur filter helps to eliminate noise where significant transitions occur in an image.  It is also 
used to improve details by smoothing an image with significant white and black adjacent pixels.

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