[SOLVED]Can't load picture after finger detection open cv python. [closed]

asked 2020-01-27 09:56:17 -0500

titli gravatar image

updated 2020-01-28 21:34:49 -0500

supra56 gravatar image

.

 # -*- coding: utf-8 -*-
"""
Created on Fri Jan 24 20:27:59 2020

@author: Shrouti
"""

import numpy as np 
import cv2
import math
import subprocess 
import time 

def calculateFingers(res,drawing): 

    hull = cv2.convexHull(res, returnPoints=False)
    if len(hull) > 3:
        defects = cv2.convexityDefects(res, hull)
        if type(defects) != type(None):  # avoid crashing.   (BUG not found)

            cnt = 0
            for i in range(defects.shape[0]):  # calculate the angle
                s, e, f, d = defects[i][0]
                start = tuple(res[s][0])
                end = tuple(res[e][0])
                far = tuple(res[f][0])

                a = math.sqrt((end[0] - start[0]) ** 2 + (end[1] - start[1]) ** 2)
                b = math.sqrt((far[0] - start[0]) ** 2 + (far[1] - start[1]) ** 2)
                c = math.sqrt((end[0] - far[0]) ** 2 + (end[1] - far[1]) ** 2)
                angle = math.acos((b ** 2 + c ** 2 - a ** 2) / (2 * b * c))  # cosine theorem
                if angle <= math.pi / 2:  # angle less than 90 degree, treat as fingers
                    cnt += 1
                    cv2.circle(drawing, far, 8, [211, 84, 0], -1)
            return True, cnt
    return False, 0


img = cv2.imread('C:\Users\Shrouti\Pictures\hand_gesture3.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

    # blur the image
blur = cv2.blur(gray, (3, 3))

#blur = cv2.GaussianBlur(img, (blur, blur), 0)
ret, thresh = cv2.threshold(blur, 60, 255, cv2.THRESH_BINARY)
cnts, hierarchy = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)


if len(cnts) > 0 :
        c = max(cnts, key=cv2.contourArea)

        hull = cv2.convexHull(c)
        drawing = np.zeros([384,320,3], np.uint8)
        cv2.drawContours(drawing, [hull], 0, (0, 0, 255), 3)  
        cv2.drawContours(drawing, [c], 0, (0, 0, 255), 3) 
        cv2.imshow('image', drawing)   
        isFinishCal,cnt = calculateFingers(c,drawing)

        # if((cnt-prev) != 0) :
        if(cnt == 4) :
                subprocess.call(['echo', 'Gesture 5 detected'], shell=True)
                prev = cnt

        # if((cnt-prev) != 0) :
        if(cnt == 3) :
                subprocess.call(['echo', 'Gesture 4 detected'], shell=False)
                prev = cnt

        # if((cnt-prev) != 0) :
        if(cnt == 2) :
                subprocess.call(['echo', 'Gesture 3 detected'], shell=True)
                prev = cnt

        # if((cnt-prev) != 0) :
        if(cnt == 1) :
                subprocess.call(['echo', 'Gesture 2 detected'], shell=True)
                prev = cnt

        #cv2.putText(img,'cnt',(10,250), cv2.FONT_HERSHEY_SIMPLEX, 4,(255,255,255),2,cv2.LINE_AA)
        print cnt+1

In the above code fingure count is being shown, but no image is being loaded. Please help. I am not getting any output of "cv2.drawcontours()" function also.

image description image description

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Closed for the following reason the question is answered, right answer was accepted by berak
close date 2020-01-27 11:12:16.957263

Comments

1

you need to call cv2.waitKey() after cv2.imshow() else it won't draw anything

but no image is being loaded

what do you mean ? it would crash without an image loaded.

also, please put your cv2.putText before imshow, else you don't see it (or the wrong txt)

berak gravatar imageberak ( 2020-01-27 10:31:19 -0500 )edit
1

thank you ...it works now :)

titli gravatar imagetitli ( 2020-01-27 10:59:50 -0500 )edit