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Unread 27-01-2017, 16:01
Espo Espo is offline
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AKA: Ben
FRC #5113 (Combustible Lemons)
Team Role: Programmer
 
Join Date: Jan 2016
Rookie Year: 2016
Location: Moorestown, NJ
Posts: 6
Espo is an unknown quantity at this point
OpenCV question about thresholding

We are using OpenCV (python) to threshold an image. I saw team 254's presentation, which said to use HSV/HSL. We are using HSV. However, I believe that OpenCV is still expecting a BGR format. How do I have it take in an HSV/HSL formatted color?

Here is our code:

Code:
import numpy as np
import cv2
from networktables import NetworkTable as nettab
import logging

logging.basicConfig(level=logging.DEBUG)

#H: 0 - 360
#S: 0 - 255
#V: 0 - 255

lower_thresh = np.array([60, 150, 150])
upper_thresh = np.array([180, 255, 255])

#lower_thresh = np.array([0, 100, 0])
#upper_thresh = np.array([50, 255, 50])

lower_thresh[0] /= 2
upper_thresh[0] /= 2

nettab.setIPAddress("10.51.13.2")
nettab.setClientMode()
nettab.initialize(server="10.51.13.83")
table = nettab.getTable("vision")

print(nettab.isConnected())

cap = cv2.VideoCapture(0) #1280 x 720

while (True):
    # Capture frame-by-frame
    ret, frame = cap.read()  # frame = None, which is causing the run time error

    # Our operations on the frame come here
    new = cv2.inRange(frame, lower_thresh, upper_thresh)

    #Display the resulting frame
    cv2.imshow('BW', new)
    cv2.imshow('Color', frame)

    table.putBoolean("test", True)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()
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