Image enhancement is attempted by segmenting using Vincent Soille algorithm for watershed and basin delineation. In general watershed technique over-segments. To minimise this, the input may be preprocessed (denoised using DeNoise plugin and or blurred with function GaussBlur available in ColorIt plugin or frequency filtered with F2Quiver function of FFTQuiver or numerous other functions available for Avisynth) to reduce segmentation.
The pixel values within a basin are stretched and or shifted wrt the seed value which can be either highest or lowest within that basin. stretch and shift values can be linearly varied within the frame interval selected. By selecting suitable values of parameters an effect of finger painted image can be obtained. By Freezing a frame required length and using proper starting and ending stretch, shift values a transition from a painting to real or vice versa can be obtained.
All color formats supported by avisynth version are accepted. Stretching and shifting is done on all 3 color values of RGB formats. The criterion for limiting a basin can be all 3 colors independant or as logical AND . In case of YUY2 and YV12 Y values only are processed.
|start frame number||sf||integer||within clip||0|
|end frame number||ef||integer||not less than sf and within clip||number of frames - 1|
|%age stretch||st||integer||-100 to 100||1|
|%age shift||sh||integer||-100 to 100||-1|
|nearest 4 or 8 to be used for connectivity||connect4||boolean||true for connect 4, false for connect 8||true|
|seed value to be used to fill?||seed||bool||true for use lowest or highest value in each basin to fill. false calculate using seed and stretch and shift||false|
|lowest value is seed?||low||bool||true for use lowest value in each basin as seed. false use highest value as seed||false|
|process independantly all 3 color values for RGB formats?||separate||bool||true for processing colors separately. false all 3 color segments are processed using logical AND||false|
retouch(img,separate = false, low = true,seed = false, st = -10, sh = 0) retouch(img,sf = 20, ef = 30,separate = false, low = true,seed = false, st = -10, sh = 0, est = 10, esh = -5) retouch(dn2,sf = 0, ef = 1,separate = false, low = true, seed = false, st = -100, sh = -30, est = 0, esh = 0)
assumeframebased(img) img =separatefields() f2q = F2Quiver(img,"bvn",180,20, degree = 4) dn2 = denoise( img,lx = 360, rx = 400, ty=230,by=280, clip = false) retouch(dn2,separate = false, low = true,seed = false, st = -10) # following for paint effect #retouch(dn2,sf = 0, ef = 1,separate = false, low = true, seed = false, st = -100, sh = -30, est = 0, esh = 0) weave()
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