Calculate image similarity--one of Python can also

Disclaimer: This article was originally published in Rai Yonghao (Love flower butterflies) blog Http://blog.csdn.net/lanphaday

First, two pictures into a histogram, the similarity calculation of the image is converted to the distance of the histogram calculation, the paper according to the following formula for the quantitative measurement of histogram similarity:

Sim (g,s) =

Where G,s is the histogram and N is the color space sample point

Convert to the appropriate Python code as follows:

#!/usr/bin/env python#Coding=utf-8ImportImagedefMake_regalur_image (img,size= (256,256)):    returnImg.resize (size). CONVERT ('RGB')defSplit_image (img,part_size= (64,64)): W,h=img.size pw,ph=part_sizeassertW%PW = = h%ph==0return[Img.crop ((I,J,I+PW,J+PH)). Copy () forIinchXrange (0,W,PW) forJinchxrange (0,h,ph)]defhist_similar (LH,RH):assertLen (LH) = =Len (RH)returnSUM (-0ifL==rElseFloat (ABS (L-R))/max (l,r)) forL,rinchZip (LH,RH))/Len (LH)defcalc_similar (Li,ri):#return Hist_similar (Li.histogram (), Ri.histogram ())    returnSum (Hist_similar (L.histogram (), R.histogram ()) forL,rinchZip (Split_image (LI), Split_image (RI)))/16.0defCalc_similar_by_path (LF,RF): Li,ri=make_regalur_image (Image.open (LF)), Make_regalur_image (Image.open (RF) )returncalc_similar (Li,ri)defMake_doc_data (LF,RF): Li=make_regalur_image (Image.open (LF)) RI=Make_regalur_image (Image.open (RF)) Li.save (LF+'_regalur.png') Ri.save (RF+'_regalur.png') FD= Open ('Stat.csv','W') Fd.write ('\ n'. Join (L +','+r forL,rinchZip (Map (Str,li.histogram ()), Map (Str,ri.histogram ()))) Fd.close ()ImportImagedraw Li= Li.convert ('RGB') Draw=Imagedraw.draw (LI) forIinchXrange (0,256,64): Draw.line ((0,i,256,i), fill ='#F00') Draw.line (I,0,i,(fill=),'#F00') Li.save (LF+'_lines.png')if __name__=='__main__': Path= R'test/test%d/%d.jpg'     forIinchXrange (1,7):        Print 'test_case_%d:%.3f%%'% (I,calc_similar_by_path ('test/test%d/%d.jpg'% (i,1),'test/test%d/%d.jpg'% (i,2)) *100) Make_doc_data ('test/test4/1.jpg','test/test4/2.jpg')

Reference:

Using Python to do image processing

Calculate image Similarity--One of Python can also

Calculate image similarity--one of Python can also