Webdriver Advanced Applications-accurate comparison of page screenshot images

Determine if the two graphs are exactly the same, and if there is any inconsistency, the picture does not match and the code is as follows:

#Encoding=utf-8 fromSeleniumImportWebdriverImportUnitTest, time fromPILImportImageclassImagecompare (object):" "This class implements the algorithm of pixel alignment for two pictures, gets the number of pixels in the file and then uses a loop to compare all items of two pictures by one by one, and calculates the percentage of similarity between the results." "    defMake_regalur_image (Self, IMG, size= (256, 256)):        #force the picture size to the specified size        #and then convert it to an RGB value        returnImg.resize (size). CONVERT ('RGB')    defSplit_image (Self, IMG, part_size= (64, 64)):        #Slice a picture by a given sizeW, 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 (Self, LH, RH):#similarity frequency curves for each part of the picture after statistical segmentation        assertLen (LH) = =Len (RH)returnSUM (1-(0ifL = = RElseFloat (ABS (L-R))/Max (L, R)) forL, RinchZip (LH, RH))/Len (LH)defcalc_similar (self, Li, RI):#calculate the similarity of two pictures        returnsum (self.hist_similar (L.histogram (), R.histogram ()) forL, RinchZip (Self.split_image (LI), Self.split_image (RI)))/16.0defCalc_similar_by_path (self, LF, RF): Li, RI=self.make_regalur_image (Image.open (LF)), Self.make_regalur_image (Image.open (RF) )returnself.calc_similar (Li, RI)classTestdemo (unittest. TestCase):defsetUp (self): self. IC=Imagecompare ()#start the Firefox browserSelf.driver = Webdriver. Ie (Executable_path ="E:\\iedriverserver")    defTest_imagecomparison (self):#url = "http://doc.outofmemory.cn/python/webpy-cookbook/"URL ="http://www.sohu.com"        #Visit Sogou homepageself.driver.get (URL) time.sleep (3)        #interception first Visit Sogou homepage pictures, and save in localSelf.driver.save_screenshot ("E:\\sogou1.png") self.driver.get (URL) time.sleep (3)        #interception of a second visit to Sogou homepage pictures, and saved in the localSelf.driver.save_screenshot ("E:\\sogou2.png")        #print two pairs of similarity, 100 means exact match        PrintSelf. Ic.calc_similar_by_path ('E:\\sogou1.png','E:\\sogou2.png') * 100defTearDown (self):#Exit IE Browserself.driver.quit ()if __name__=='__main__': Unittest.main ()

Webdriver Advanced Applications-accurate comparison of page images