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isp:sharpness [2019/05/08 23:58]
Igor Yefmov
isp:sharpness [2019/05/09 00:02]
Igor Yefmov
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 ====== Sharpness ====== ====== Sharpness ======
  
-We define sharpness as the difference of brightness (the pixel'​s ​''​L'' ​component in HSL color space) from a pixel to its neighboring pixels.+We define sharpness as the difference of brightness (the pixel'​s ​\(L\) component in HSL color space) from a pixel to its neighboring pixels.
  
-Sharpness for each pixel is calculated based on the values of immediately surrounding it pixels, only the luma component ​''​L'' ​is used for this calculation.+Sharpness for each pixel is calculated based on the values of immediately surrounding it pixels, only the luma component ​\(L\) is used for this calculation.
  
-A pixel'​s new value is calculated based on the simple matrix (see below) with a little twist: the central coefficient of 5 is adjusted based on the new value of sharpness as follows: \(coef_5 = 5 + sharpness\),​ where \(sharpness\) is in range ''​[-1..+1]''​.+A pixel'​s new value is calculated based on the simple matrix (see below) with a little twist: the central coefficient of 5 is adjusted based on the new value of sharpness as follows: \(coef_5 = 5 + sharpness\),​ where \(sharpness\) is in range \([-1..+1]\).
  
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/home/adminsub2r/public_html/dokuwiki/data/pages/isp/sharpness.txt · Last modified: 2019/05/09 00:02 by Igor Yefmov