testXfCanny.py

#!/usr/bin/python3.6

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print("Running testXfCanny.py ...")
print("Loading overlay")
from pynq import Overlay
bs = Overlay("/usr/local/lib/python3.6/dist-packages/pynq_cv/overlays/xv2canny.bit")
bs.download()

print("Loading xlnk")
from pynq import Xlnk
Xlnk.set_allocator_library('/usr/local/lib/python3.6/dist-packages/pynq_cv/overlays/xv2canny.so')
mem_manager = Xlnk()

import pynq_cv.overlays.xv2canny as xv2
import numpy as np
import cv2
import time

import OpenCVUtils as cvu

print("Loading image ../images/bigBunny_1080.png")
img = cv2.imread('../images/bigBunny_1080.png')
imgY = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

print("Size of imgY is ",imgY.shape);
height, width, channels = img.shape

kernel = np.array([[1.0,2.0,1.0],[0.0,0.0,0.0],[-1.0,-2.0,-1.0]],np.float32) # Sobel Horizontal Edges

numberOfIterations=10
print("Number of loop iterations: "+str(numberOfIterations))

dstSW = np.ones((height,width),np.uint8)

xFimgY  = mem_manager.cma_array((height,width),np.uint8) #allocated physically contiguous numpy array 
xFimgY[:] = imgY[:] # copy source data

xFdst  = mem_manager.cma_array((height,width),np.uint8) #allocated physically contiguous numpy array

threshold1 = 30
threshold2 = 64
apertureSize = 3
L2gradient = 0

print("Start SW loop")
startSW=time.time()
for i in range(numberOfIterations):
    cv2.Canny(imgY,threshold1,threshold2,dstSW,apertureSize,L2gradient) #canny on ARM
stopSW=time.time()


print("Start HW loop")
startPL=time.time()
for i in range(numberOfIterations):
    xv2.Canny(xFimgY,threshold1,threshold2,xFdst,apertureSize,L2gradient) #canny offloaded to PL, working on physically continuous numpy arrays
stopPL=time.time()
    
print("SW frames per second: ", ((numberOfIterations) / (stopSW - startSW)))
print("PL frames per second: ", ((numberOfIterations) / (stopPL - startPL)))

print("Checking SW and HW results match")
numberOfDifferences,errorPerPixel = cvu.imageCompare(xFdst,dstSW,True,False,0.0)
print("number of differences: "+str(numberOfDifferences)+", average L1 error: "+str(errorPerPixel))

print("Writing SW and HW results to image files.")
cv2.imwrite("canny_sw.png",dstSW)
xFdst_cp = np.ones((height,width),np.uint8)
xFdst_cp[:] = xFdst[:]
cv2.imwrite("canny_hw.png",xFdst_cp)

print("Done")