Manipulating the images

Copying the images

id –  to find the object’s memory address

• When the object array “baboon” is assigned to “A”, then the id of A is same as baboon
• If the method copy() is applied and assigned it to “B”, then then the memory address is different

baboon[:,:,] = 0

• The above statement, makes the array “baboon” and “A” to be zero because they are pointing to the same memory location.
• But the array “B” remains same

Flipping Images – PIL

• Flipping images changes the orientation
• The image can be flipped by changing the index value of a pixel or intensity

• For color images, we can convert all the color channels at the same time
• PIL
  • PIL have several ways to flip the image.
  • ImageOps Module

from PIL import ImageOps
im_flip = ImageOps.flip(image)
im_mirror= ImageOps.mirror(image)
image.transpose(Image.FLIP_TOP_BOTTOM)

Flip – vertical

Vertical flip reverses the order of rows

from PIL import ImageOps
image = Image.open("baboon.jpg")
im_flip = ImageOps.flip(image)
im_flip

Mirror – Horizontal Flip

Horizontal flip reverses the order of columns

im_mirror = ImageOps.mirror(image)
im_mirror

Transpose

image.transpose(Image.FLIP_TOP_BOTTOM)

• FLIP_TOP_BOTTOM to flip the image vertically
• FLIP_LEFT_RIGHT to flip the image horizontally (mirror)

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