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sobel.py
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sobel.py
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import cv2
import os
import numpy as np
class CoinDetector:
def __init__(self, image_path):
self.image_path = image_path
self.image = None
self.detected_coins = []
self.coin_count = 0
def load_image(self):
self.image = cv2.imread(self.image_path)
if self.image is None:
print(f"Error: Unable to load image from {self.image_path}")
exit()
def preprocess_image(self):
gray = cv2.cvtColor(self.image, cv2.COLOR_BGR2GRAY)
clahe = cv2.createCLAHE(clipLimit=2.0, tileGridSize=(8, 8))
enhanced = clahe.apply(gray)
blurred = cv2.GaussianBlur(enhanced, (25, 25), 2)
thresholded = cv2.adaptiveThreshold(
blurred, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, cv2.THRESH_BINARY, 11, 2
)
return thresholded
def detect_circles(self, image):
preprocessed_image = self.preprocess_image()
sobelx = cv2.Sobel(preprocessed_image, cv2.CV_64F, 1, 0, ksize=3) # Sobel pada arah x
sobely = cv2.Sobel(preprocessed_image, cv2.CV_64F, 0, 1, ksize=3) # Sobel pada arah y
sobel = cv2.magnitude(sobelx, sobely)
sobel = np.uint8(np.absolute(sobel))
circles = cv2.HoughCircles(
sobel, cv2.HOUGH_GRADIENT, dp=0.5, minDist=35, param1=50, param2=65, minRadius=10, maxRadius=80
)
return sobel, circles
def process_detected_coins(self, circles):
self.coin_count = len(circles[0]) if circles is not None else 0
if circles is not None:
circles = np.round(circles[0, :]).astype(int)
for circle in circles:
center = (circle[0], circle[1])
radius = circle[2]
area_mm2 = np.pi * (radius ** 1.15)
coin_name = self.get_coin_name(area_mm2)
self.detected_coins.append({
'name': coin_name,
'area_mm2': area_mm2,
'center': center,
'radius': radius
})
def get_coin_name(self, area):
rupiah_coin_ranges = {
"100 Rupiah": (240, 255), # Sekitar 254.47 mm²
"200 Rupiah": (280, 295), # Sekitar 346.36 mm²
"500 Rupiah": (300, 360), # Sekitar 452.39 mm²
"1000 Rupiah": (270, 280) # Sekitar 530.93 mm²
}
for name, area_range in rupiah_coin_ranges.items():
if area_range[0] <= area <= area_range[1]:
return name
return f"Unknown Coin ({area:.2f} mm2)"
def draw_text_on_image(self):
for coin in self.detected_coins:
text = f"{coin['name']}"
center = coin['center']
radius = coin['radius']
text_size, _ = cv2.getTextSize(text, cv2.FONT_HERSHEY_SIMPLEX, 0.2, 1)
cv2.rectangle(self.image, (center[0] - text_size[0] // 2 - 5, center[1] + radius + 5),
(center[0] + text_size[0] // 2 + 5, center[1] + radius + text_size[1] + 10), (0, 0, 0), -1)
cv2.putText(self.image, text, (center[0] - text_size[0] // 2, center[1] + radius + text_size[1] + 5),
cv2.FONT_HERSHEY_SIMPLEX, 0.2, (255, 255, 255), 1, cv2.LINE_AA)
text_count = f"Jumlah Objek Terdeteksi: {self.coin_count}"
cv2.putText(self.image, text_count, (20, 20), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 1, cv2.LINE_AA)
def draw_contours_on_image(self):
for coin in self.detected_coins:
center = coin['center']
radius = coin['radius']
cv2.circle(self.image, center, radius, (0, 255, 0), 2)
def resize_image(self, image, factor_x=1, factor_y=1):
return cv2.resize(image, (int(image.shape[1] * factor_x), int(image.shape[0] * factor_y)))
def display_result(self, sobel_image):
resized_image = self.resize_image(self.image)
sobel_resized = self.resize_image(sobel_image)
sobel_resized_bgr = cv2.cvtColor(sobel_resized, cv2.COLOR_GRAY2BGR)
combined_image = np.hstack((sobel_resized_bgr, resized_image))
cv2.imshow('Menggunakan Sobel | Mohamad Nafis', combined_image)
cv2.waitKey(0)
cv2.destroyAllWindows()
def process_image(self):
self.load_image()
preprocessed_image = self.preprocess_image()
sobel_image, circles = self.detect_circles(preprocessed_image)
self.process_detected_coins(circles)
self.draw_contours_on_image()
self.draw_text_on_image()
self.display_result(sobel_image)
def main():
image_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'image.png')
coin_detector = CoinDetector(image_path)
coin_detector.process_image()
if __name__ == "__main__":
main()