Abstract:
The most vivacious area of the image processing
is image enhancement. Newer techniques and ideas are
being routinely incorporated to this field for the proper
enhancement to make the original image suitable for some
specific purposes. However, the techniques that are
suitable for X-ray image enhancement may not necessarily
be suitable for enhancement of the Satellite Telescope
Transmitted (STT) images. Many times, Medical images
especially X-ray images are required to be sharper than its
original version for proper information extraction that is
necessary for diagnostic purposes. Homomorphic filters
that actually belong to the group of the sharpening filters
can be employed for finding fine details in the X-ray
images. The Homomorphic filters use the Discrete Fourier
Transforms (DFT) as the core transform. Presently, more
efficient tools for transformations are being used; such as
the Discrete Cosine Transform (DCT), Discrete Wavelet
Transform (DWT), Fast Fourier Transform (FFT) and Fast
Wavelet Transform (FWT) in digital image processing. In
this paper, along with the conventional DFT technique,
DCT, DWT, FFT and FWT are incorporated in the image
transformation process that consequently modifies the core
process of Homomorphic filters. The performance of the
resulting modified Homomorphic filters are compared with
that of the original filter. The performance enrichment has
become evident from the numerical and the visual
comparisons.
