OpenCV-Basics-Tutorial/Phase_2/ImageManipulationTransformation_Part01.py at main · NDDimension/OpenCV-Basics-Tutorial · GitHub

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"""
"Image Manipulations and Transformations in OpenCV"
"""

import cv2

img = cv2.imread("../Img/3.jpeg")

# Resizing and Scaling
resized = cv2.resize(img, (800, 500))
cv2.imshow("Resized", resized)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("resized.jpg", resized)

# Cropping
cropped = img[100:200, 50:150]
cv2.imshow("Cropped", cropped)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("crop.jpg", cropped)

# Rotation
h, w = img.shape[:2]
center = (h // 2, w // 2)

# Scale as Full 1
M_scalefull = cv2.getRotationMatrix2D(center, 90, scale=1.0)
rotated_img1 = cv2.warpAffine(img, M_scalefull, (w, h))
cv2.imshow("Rotated Img", rotated_img1)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Scale as Half 0.5
M_scalehalf = cv2.getRotationMatrix2D(center, 90, scale=0.5)
rotated_img2 = cv2.warpAffine(img, M_scalehalf, (w, h))
cv2.imshow("Rotated Img", rotated_img2)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Scale as Double Zoomed in 2
M_scaledouble = cv2.getRotationMatrix2D(center, 90, scale=2.0)
rotated_img3 = cv2.warpAffine(img, M_scaledouble, (w, h))
cv2.imshow("Rotated Img", rotated_img3)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Rotated clockwise
M = cv2.getRotationMatrix2D(center, -90, scale=0.5)
rotated_img4 = cv2.warpAffine(img, M, (w, h))
cv2.imshow("Rotated Img", rotated_img4)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Rotated 180 degree
M = cv2.getRotationMatrix2D(center, 180, scale=0.5)
rotated_img5 = cv2.warpAffine(img, M, (w, h))
cv2.imshow("Rotated Img", rotated_img5)
cv2.waitKey(0)
cv2.destroyAllWindows()


cv2.imwrite("Rotated_img1.jpeg", rotated_img1)
cv2.imwrite("Rotated_img0.5.jpeg", rotated_img2)
cv2.imwrite("Rotated_img2.jpeg", rotated_img3)
cv2.imwrite("Rotated_img-90.jpeg", rotated_img4)
cv2.imwrite("Rotated_img180.jpeg", rotated_img5)

# Flipping

# Top to Bottom
flipped0 = cv2.flip(img, 0)
cv2.imshow("Flipped", flipped0)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Left to Right
flipped1 = cv2.flip(img, 1)
cv2.imshow("Flipped", flipped1)
cv2.waitKey(0)
cv2.destroyAllWindows()

# Top to Bottom and Left to Right
flippedminus1 = cv2.flip(img, -1)
cv2.imshow("Flipped", flippedminus1)
cv2.waitKey(0)
cv2.destroyAllWindows()

cv2.imwrite("Flipped0.jpeg", flipped0)
cv2.imwrite("Flipped1.jpeg", flipped1)
cv2.imwrite("Flipped-1.jpeg", flippedminus1)