Detecting Clicks on Image [7] | OpenCV Python Tutorials for Beginners

In this video, we will learn how to detect clicks on an image. Using these x and y coordinates detected we will warp an image.

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[ZachFerris-nx]

This works great! However, I am having trouble identifying where "break" needs to go in the loop so I can call cv2.destroyAllWindows at the end. Right now I have to manually end the code.

[usmankhawar]

sir is there a workaroundt that instead of refrencing the location of image. when we launch the appliation it give a cross hair and we can do this (set cordinates) in the live (current screen)

[yuvrajsinhchauhan]

Hey can you show how to crop object from image if object's shape(like book) is not square and the object is diamond .So how can we crop diamond from image using more circles(6 circles).

[pravuchaudhary]

Mr. Murtaza, what is it used for flags/param when defining events?

[samarthas]

cv2.circle(img, ([pts1[x][0], pts1[x][1]]), 15, (0, 255, 0), cv2.FILLED)



cv2.error: OpenCV(4.5.2) :-1: error: (-5:Bad argument) in function 'circle'
> Overload resolution failed:
> - Can't parse 'center'. Sequence item with index 0 has a wrong type
> - Can't parse 'center'. Sequence item with index 0 has a wrong type


i am getting this error

[i_am_slayer_]

hello sir why you changed the delay from cv2.waitKey(0) to cv2.waitKey(1)

[yashabhgoyal]

you forget to tell about "global counter". error occurred... but now i fixed it

[modykhalil]

How just can i return x, y of one clicked position to compare of points from

[mdmokshedurrahman]

Code(import cv2
import numpy as np

# Initialize variables
circles = np.zeros((4, 2), int)
counter = 0

# Define the mouse callback function
def mousePointer(event, x, y, flags, param):
global counter
if event == cv2.EVENT_LBUTTONDOWN:
print(x, y)
circles[counter] = x, y
counter += 1
print(circles)

# Read the image
img = cv2.imread("image/me.jpg")
width, height = 250, 350

# Check if the image is loaded successfully
if img is None:
print("nothing as a image")
else:
cv2.imshow("original img", img)
img", mousePointer)

while True:
for x in range(0, 4):
cv2.circle(img, (int(circles[x][0]), int(circles[x][1])), 5, (0, 0, 255), cv2.FILLED)

if counter == 4:
pts1 = np.float32(circles)
pts2 = np.float32([[0, 0], [width, 0], [0, height], [width, height]])
matrix = cv2.getPerspectiveTransform(pts1, pts2)
imgOutput = cv2.warpPerspective(img, matrix, (width, height))
cv2.imshow("imgOutput", imgOutput)

cv2.imshow("original img", img)
if cv2.waitKey(1) & 0xFF == ord('q'):
break

cv2.destroyAllWindows()

)

[bulletforcekurdish]

Hello, I am getting the following error: Traceback (most recent call last):
File "C:/Users/DOS/PycharmProjects/myproject1/WarpPerspective.py", line 8, in <module>
matrix = cv2.getPerspectiveTransform(pts1, pts2)
cv2.error: OpenCV(4.6.0) error: (-215:Assertion failed) src.checkVector(2, CV_32F) == 4 && dst.checkVector(2, CV_32F) == 4 in function 'cv::getPerspectiveTransform'

[aneesjaveed]

You can even crop the image with 3 points

[evagok]

I keep having errors with cv2 and sometimes it works sometimes it doesn't, I don't get it why

[nachetons]

how to remove 1 point?, specifically the last point

[ishankrajpal]

suddenly the basic code also is not working...it is giving the error....cv2.error: OpenCV(4.5.3) error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'
PLEASE TELL ME HOW DO I FIX THIS

[evagok]

I tried to fix it but it is actually working but its weird

[dawitworkenh]

bro change ur screen in to bright if u can

[cezaryczarkowsky]

How to remove points from the output image? The green points are cropped...

[rajshekharghosh]

can anyone share the code? I am not getting it, how with waitkey(1) I will be able to hold the picture for that long, and my if count is also not working.

[mertolojis]

v2.circle(img, (pts1[x][0], pts1[x][1]), 15, (0, 255, 0), cv2.FİLLED)
AttributeError: module 'cv2.cv2' has no attribute 'FİLLED'
ı got this error what should ı do?

[redhwanalgabri]

How to click on an image automatically?