plt.imread error

[YCWangVince]

I think there is a small error on plt.imread('....png')

plt.imread got a 4 channel .png images. The first three channels are RGB, respectively, and the fourth channel is the maximum value=1.0 for each pixel.

groundtruth=groundtruth[:,:,:-1] is needed to remove the fourth channel below line 26 in script.imgProcess.py