(Aug-25-2019, 10:46 PM)Larz60+ Wrote: [ -> ]code please
I am using OCR simply and that was read text but this code i took from github and change one or two line of code and then try and accuracy was not good read some character wrong.
import cv2
import numpy as np
import os
import DetectChars
import DetectPlates
import PossiblePlate
# module level variables ##########################################################################
SCALAR_BLACK = (0.0, 0.0, 0.0)
SCALAR_WHITE = (255.0, 255.0, 255.0)
SCALAR_YELLOW = (0.0, 255.0, 255.0)
SCALAR_GREEN = (0.0, 255.0, 0.0)
SCALAR_RED = (0.0, 0.0, 255.0)
showSteps = False
###################################################################################################
def main():
blnKNNTrainingSuccessful = DetectChars.loadKNNDataAndTrainKNN() # attempt KNN training
if blnKNNTrainingSuccessful == False: # if KNN training was not successful
print("\nerror: KNN traning was not successful\n") # show error message
return # and exit program
# end if
imgOriginalScene = cv2.imread("p.jpg") # open image
# exit()
if imgOriginalScene is None: # if image was not read successfully
print("\nerror: image not read from file \n\n") # print error message to std out
os.system("pause") # pause so user can see error message
return # and exit program
# exit()
# end if
listOfPossiblePlates = DetectPlates.detectPlatesInScene(imgOriginalScene) # detect plates
# exit()
listOfPossiblePlates = DetectChars.detectCharsInPlates(listOfPossiblePlates) # detect chars in plates
# print(listOfPossiblePlates)
# exit()
cv2.imshow("imgOriginalScene", imgOriginalScene) # show scene image
if len(listOfPossiblePlates) == 0: # if no plates were found
print("\nno license plates were detected\n") # inform user no plates were found
else: # else
# if we get in here list of possible plates has at leat one plate
# sort the list of possible plates in DESCENDING order (most number of chars to least number of chars)
listOfPossiblePlates.sort(key = lambda possiblePlate: len(possiblePlate.strChars), reverse = True)
# suppose the plate with the most recognized chars (the first plate in sorted by string length descending order) is the actual plate
licPlate = listOfPossiblePlates[0]
# print(licPlate)
# exit()
# cv2.imshow("imgPlate", licPlate.imgPlate) # show crop of plate and threshold of plate
# cv2.imshow("imgThresh", licPlate.imgThresh)
if len(licPlate.strChars) == 0: # if no chars were found in the plate
print("\nno characters were detected\n\n") # show message
return # and exit program
# end if
drawRedRectangleAroundPlate(imgOriginalScene, licPlate) # draw red rectangle around plate
print("\nlicense plate read from image = " + licPlate.strChars + "\n") # write license plate text to std out
print("----------------------------------------")
writeLicensePlateCharsOnImage(imgOriginalScene, licPlate) # write license plate text on the image
print(imgOriginalScene)
cv2.imshow("imgOriginalScene", imgOriginalScene) # re-show scene image
cv2.imwrite("imgOriginalScene.png", imgOriginalScene) # write image out to file
# end if else
cv2.waitKey(0) # hold windows open until user presses a key
return
# end main
###################################################################################################
def drawRedRectangleAroundPlate(imgOriginalScene, licPlate):
p2fRectPoints = cv2.boxPoints(licPlate.rrLocationOfPlateInScene) # get 4 vertices of rotated rect
cv2.line(imgOriginalScene, tuple(p2fRectPoints[0]), tuple(p2fRectPoints[1]), SCALAR_RED, 2) # draw 4 red lines
cv2.line(imgOriginalScene, tuple(p2fRectPoints[1]), tuple(p2fRectPoints[2]), SCALAR_RED, 2)
cv2.line(imgOriginalScene, tuple(p2fRectPoints[2]), tuple(p2fRectPoints[3]), SCALAR_RED, 2)
cv2.line(imgOriginalScene, tuple(p2fRectPoints[3]), tuple(p2fRectPoints[0]), SCALAR_RED, 2)
# end function
###################################################################################################
def writeLicensePlateCharsOnImage(imgOriginalScene, licPlate):
ptCenterOfTextAreaX = 0 # this will be the center of the area the text will be written to
ptCenterOfTextAreaY = 0
ptLowerLeftTextOriginX = 0 # this will be the bottom left of the area that the text will be written to
ptLowerLeftTextOriginY = 0
sceneHeight, sceneWidth, sceneNumChannels = imgOriginalScene.shape
plateHeight, plateWidth, plateNumChannels = licPlate.imgPlate.shape
intFontFace = cv2.FONT_HERSHEY_SIMPLEX # choose a plain jane font
fltFontScale = float(plateHeight) / 30.0 # base font scale on height of plate area
intFontThickness = int(round(fltFontScale * 1.5)) # base font thickness on font scale
textSize, baseline = cv2.getTextSize(licPlate.strChars, intFontFace, fltFontScale, intFontThickness) # call getTextSize
# unpack roatated rect into center point, width and height, and angle
( (intPlateCenterX, intPlateCenterY), (intPlateWidth, intPlateHeight), fltCorrectionAngleInDeg ) = licPlate.rrLocationOfPlateInScene
intPlateCenterX = int(intPlateCenterX) # make sure center is an integer
intPlateCenterY = int(intPlateCenterY)
ptCenterOfTextAreaX = int(intPlateCenterX) # the horizontal location of the text area is the same as the plate
if intPlateCenterY < (sceneHeight * 0.75): # if the license plate is in the upper 3/4 of the image
ptCenterOfTextAreaY = int(round(intPlateCenterY)) + int(round(plateHeight * 1.6)) # write the chars in below the plate
else: # else if the license plate is in the lower 1/4 of the image
ptCenterOfTextAreaY = int(round(intPlateCenterY)) - int(round(plateHeight * 1.6)) # write the chars in above the plate
# end if
textSizeWidth, textSizeHeight = textSize # unpack text size width and height
ptLowerLeftTextOriginX = int(ptCenterOfTextAreaX - (textSizeWidth / 2)) # calculate the lower left origin of the text area
ptLowerLeftTextOriginY = int(ptCenterOfTextAreaY + (textSizeHeight / 2)) # based on the text area center, width, and height
# write the text on the image
cv2.putText(imgOriginalScene, licPlate.strChars, (ptLowerLeftTextOriginX, ptLowerLeftTextOriginY), intFontFace, fltFontScale, SCALAR_YELLOW, intFontThickness)
# end function
###################################################################################################
if __name__ == "__main__":
main()