Grab frame from diddyborg stream and view it using imshow

Submitted by YAZID on Fri, 04/28/2017 - 12:53

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ZeroBorg and YetiBorg v2

I'm currently playing around with diddyborg follow red ball code. the code runs perfectly on my Pi without those PicoBorg code (removed them for now). I haven't attached my ZeroBorg to the Pi so im currently testing just the video streaming and detection part.

But how do grab the frame and display them on the screen? i wanna see what the camera sees. because i'm planning to use this code as my template for line following robot (follow black line over white background)

can i use something like this? --> cv2.imshow('frame',frame_array)
but i don't know where to implement that method in the code.

it's because the code seems quite complex for my level to understand deeply although i have a pretty basic
understandings of threading that are mostly used in the code.

i hope piborg could help me with this. thanks =)

piborg

Fri, 04/28/2017 - 14:55

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Showing images in diddyFollowBall.py

You are on the right lines, cv2.imshow is the function you want. You will also need a call like cv2.waitkey to get the window to display correctly.

What I would suggest is adding these calls to the start of the ProcessImage function. For example:

# Image processing function
def ProcessImage(self, image):
    # Show the image before processing
    cv2.imshow('before processing', image)
    cv2.waitkey(1)
    # Get the red section of the image

YAZID

Sat, 04/29/2017 - 12:22

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Thank you so much. that

Thank you so much. that method works well. actually the only line that i've been missing was that cv2.waitKey(1). i didn't realize that the cv2.waitKey(1) was such an important part of displaying images in OpenCV. now i've learned something useful.

I hope that i could use this code for line following purposes since the tracking algorithm for the red ball is quite reliable. do you have any suggestions for me to start with?