<Warning>
This article was written based on my experience.
</Warning>
1. How Read Image in disc?
You can read by using cv2.imread function.
<Caution>
In python version 2.7, you need writing path '\\', not '\'
</Caution>
<Code>
import cv2
Image = cv2.imread("Path", cv2.CV_LOAD_IMAGE_GRAYSCALE)
</Code>
2. How Show Image in memory?
Need cv2.imshow function
<Caution>
If you not use cv2.waitKey && ( cv2.destroyWindow || cv2.destroyAllWindows ).
It make python IDE to restart
</Caution>
<Code>
import cv2
def ShowImage(Image, WinName="TempWinName"):
cv2.imshow(WinName, Image)
cv2.waitKey()
cv2.destroyWindow(WinName)
ShowImage(Image)
</Code>
3. How Get Size of Image?
Because openCV2 use numpy's array.
You can get size by using Image.shape
shape == (Row, Col, nChannel) or (Height, Width, nChannel)
<Caution>
If Image is 3 channel (like RGB or BGR), shape's length is 3
If Image is grayscale, shape's length is 2
So if you access nChannel in grayscale, It raiseIndexError
</Caution>
<Code>
</Code>
4. How Access each pixel in Image?
Just you "[]" :)
<Caution>
Image[☆Height, ☆Width, nChannel]
If you access all the pixel by using for(;;),
It will waste long time
Must use openCV function as possible as you can.
</Caution>
<Code>
</Code>
