PCA face recognition study notes --- code articles

View and change the current working path

path="D:\\python-file\\faker"
os.chdir(path)
retval=os.getcwd()
print(retval)

Glob usage:

glob.glob(path+r ' *.jpg ' )

I am here to get all the jpg files under the path

python reads image:

Python can use the two libraries matplotlib and PIL to manipulate pictures, here use PIL

For color images, no matter the image format is PNG, BMP, or JPG, in PIL, after using the open() function of the Image module to open, the mode of the returned image object is "RGB". For grayscale images, no matter the image format is PNG, BMP, or JPG, after opening, its mode is "L"

There are nine different modes in PIL. 1, L, P, RGB, RGBA, CMYK, YCbCr, I, F respectively.

Read every image in the directory

for name in glob.glob(path+r'*.jpg'):
    im = Image.open(name)

Grayscale

im_grey = im.convert('L')

You can also directly:

im = Image.open(name).convert('L')

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