Astronomy Python - Chatgpt based- Count Star from the Image

Every person who is interested in analyzing night sky image should try the python script mentioned in the blog. 

Special Thanks and all credit goes to "Chatgpt", who has generated the code (with minor modifications from my side). Below is  image of night sky-

Execute below program in juypter notebook

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import cv2

import numpy as np

# Load the image

image = cv2.imread('E:\\astronomy_related\\wint_sky_j.jpg')

# Convert the image to grayscale

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

# Blur the image to reduce noise

blurred = cv2.GaussianBlur(gray, (5, 5), 0)

# Threshold the image to create a binary image

#thresh = cv2.threshold(blurred, 220, 255, cv2.THRESH_BINARY)[1]

thresh = cv2.threshold(blurred, 150, 255, cv2.THRESH_BINARY)[1]

# Find contours in the image

contours = cv2.findContours(thresh, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

contours = contours[0] if len(contours) == 2 else contours[1]

# Loop through the contours and draw a rectangle around each one

for c in contours:

    x,y,w,h = cv2.boundingRect(c)

    #cv2.rectangle(image, (x, y), (x + w, y + h), (36,255,12), 2)

    cv2.circle(image, (x,y), 10, (0, 250, 255), 1)

# Show the image

cv2.imshow('Bright Spots', image)

cv2.waitKey(0)

# Print the number of bright spots

print('Number of bright spots:', len(contours))

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Below output is created.

You may change

1)Threshold to count more dimmer star

2)instead of putting yellow circle, rectangle dot can be drawn