Configure Image Detector to Detect Different Shapes of Candies in Python

Detecting different shapes of candies using computer vision techniques can be both fun and practical. If you need assistance with this task, our service offer Python assignment help to configure an image detector in Python and identify various shapes of candies. By leveraging the power of OpenCV and our step-by-step explanations, you'll gain a clear understanding of the implementation process. Let's dive in!

Block 1: Import Libraries

```python import cv2 import numpy as np ```

Our Explanation:

To kickstart our shape detection algorithm, we begin by importing essential libraries. The `cv2` library is the powerful OpenCV tool that provides us with various computer vision functions. In conjunction, we use the versatile `numpy` library (as `np`) for numerical computations and array manipulations, complementing the functionality of OpenCV.

Block 2: Load and Preprocess the Image

```python def preprocess_image(image_path): image = cv2.imread(image_path) gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) blurred_image = cv2.GaussianBlur(gray_image, (5, 5), 0) return image, blurred_image ```

Our Explanation:

We believe in effective preprocessing as a key step in image analysis. In this block, our `preprocess_image` function loads the input image and applies crucial preprocessing steps. We use `cv2.imread` to read the image, followed by converting it to grayscale using `cv2.cvtColor`. This step simplifies the subsequent shape-detection process. We then employ `cv2.GaussianBlur` to reduce noise and smoothen the image, leading to better contours during shape detection.

Block 3: Detect Contours

```python def detect_contours(blurred_image): edges = cv2.Canny(blurred_image, 50, 150) contours, _ = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) return contours ```

Our Explanation:

To identify candy shapes accurately, we must find their contours. Our `detect_contours` function plays a crucial role in this task. We leverage the Canny edge detection algorithm, available through `cv2.Canny`, to detect edges in the preprocessed image. This edge information is then utilized by `cv2.findContours` to locate and extract contours from the image. The function returns a list of contours, which serves as the foundation for our shape detection.

Block 4: Shape Detection

```python def detect_shapes(image, contours): detected_shapes = [] for contour in contours: perimeter = cv2.arcLength(contour, True) approx = cv2.approxPolyDP(contour, 0.04 * perimeter, True) if len(approx) == 3: shape_name = "Triangle" elif len(approx) == 4: x, y, w, h = cv2.boundingRect(approx) aspect_ratio = float(w) / h if 0.95 <= aspect_ratio <= 1.05: shape_name = "Square" else: shape_name = "Rectangle" elif len(approx) == 5: shape_name = "Pentagon" else: shape_name = "Circle" detected_shapes.append((shape_name, contour)) return detected_shapes ```

Our Explanation:

Our `detect_shapes` function takes the preprocessed image and the list of contours as inputs to identify and classify the shapes of candies. We use the `cv2.arcLength` function to calculate the perimeter of each contour. Utilizing the `cv2.approxPolyDP` function, we approximate each contour's shape by reducing the number of vertices while preserving the overall structure. Based on the number of vertices after approximation, we categorize the shape as a Triangle, Square, Rectangle, Pentagon, or Circle.

Block 5: Main Function

```python if __name__ == "__main__": image_path = "path/to/your/image.jpg" image, blurred_image = preprocess_image(image_path) contours = detect_contours(blurred_image) detected_shapes = detect_shapes(image, contours) for shape_name, contour in detected_shapes: cv2.drawContours(image, [contour], 0, (0, 255, 0), 2) cv2.putText(image, shape_name, (contour[0][0][0], contour[0][0][1]), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2) cv2.imshow("Detected Shapes", image) cv2.waitKey(0) cv2.destroyAllWindows() ```

Our Explanation:

In our main function, we bring all the previous blocks together to detect and visualize candy shapes. As a user, you can replace `"path/to/your/image.jpg"` with the actual path to your input image. The program will then preprocess the image, detect the shapes, draw contours around the candies, and label each shape with its name. The image with the detected shapes will be displayed, and the program will wait for a key press before closing the window.

Conclusion:

By following this guide, you have successfully configured an image detector in Python to identify different shapes of candies. Computer vision techniques offer powerful solutions for shape detection, opening up possibilities for various applications beyond candies. Understanding these concepts can be instrumental in solving real-world problems and unleashing your creativity.