I'm still on the process of searching references:
[1] http://www.picturesolve.com,
[2] http://ieeexplore.ieee.org/iel3/4760/13241/00600843.pdf
[3] How to Sharpen an Image in Photoshop, http://www.photoshopsupport.com/tutorials/sharpen-an-image/photo-sharpening.html
[4] Sharpen Effect, http://www.websupergoo.com/helpie/source/2-effects/sharpen.htm
Hehe, we changed topic. Sharpening of images taken under a microscope. Due to the limited depth of field of the microscope, and the sample's varying topography, some parts of the image become blurred. The sharpening filter to be used is a high-boost filter given by
H = (1/9)*[-1 -1 -1; -1 w -1; -1 -1 -1]; (1)
where w = 9A-1 with A>1. The effect of the above mask is an ouput image related to the original by this equation
High-boost Output = (A - 1) Original + Highpass [2].
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