ImageManipulationTransformation_Part02.py

# Basic Drawing Techniques

import cv2

img = cv2.imread("../Img/4.jpeg")

# Drawing a Line
h, w = img.shape[0], img.shape[1]

# vertical
linev = cv2.line(
    img.copy(), (w // 2, 0), (w // 2, h), color=(255, 255, 255), thickness=50
)
cv2.imshow("vertical line img", linev)
cv2.waitKey(0)
cv2.destroyAllWindows()

# horizontal
lineh = cv2.line(
    img.copy(), (0, h // 2), (w, h // 2), color=(255, 255, 255), thickness=50
)
cv2.imshow("horizontal line img", lineh)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("Vertical Line.jpeg", linev)
cv2.imwrite("Horizontal Line.jpeg", lineh)

# Drawing a Rectangle

rectangle = cv2.rectangle(
    img.copy(), (1, 1), (w - 2, h - 2), color=(255, 0, 0), thickness=50
)
cv2.imshow("rectangle", rectangle)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("Rectangle.jpeg", rectangle)

# Drawing a circle
circle = cv2.circle(
    img.copy(), center=(w // 2, h // 2), radius=150, color=(0, 0, 0), thickness=40
)
cv2.imshow("circle", circle)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("Circle.jpeg", circle)

# Adding text
text_img = cv2.putText(
    img.copy(),
    "Hi TEXT",
    (0, h - 2),
    cv2.FONT_HERSHEY_PLAIN,
    fontScale=10.0,
    color=(0, 255, 0),
    thickness=15,
)
cv2.imshow("Text", text_img)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("TextImage.jpeg", text_img)

# More detailed way to add text
# Text settings
text = "Hi TEXT"
font = cv2.FONT_HERSHEY_PLAIN
font_scale = 10.0
thickness = 15

# Measure text size
(text_width, text_height), baseline = cv2.getTextSize(text, font, font_scale, thickness)

# Calculate centered position
x = (w - text_width) // 2
y = (h + text_height) // 2  # y is baseline-bottom, so add text height

# Draw the text
detailedtext_img = cv2.putText(
    img.copy(), text, (x, y), font, font_scale, (0, 255, 0), thickness
)

# Show
cv2.imshow("Text", detailedtext_img)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("DetailedText.jpeg", detailedtext_img)