如何调用需要自我参数的函数

Question

I'm trying to test one function which returns the CLD features.. it only requires use numpy library.. I'm testing it but it always says that requires a self parameter. I don't know why it is happening because the function only is receiving one image which I'm loading with opencv.

Here is the class that I'm trying to use: colorlayoutdescriptor.py

import numpy as np

class ColorLayoutDescriptor:
    def __init__(self):
        self.rows = 8
        self.cols = 8
        self.prefix = "CLD"

    def compute(self, img):
        averages = np.zeros((self.rows,self.cols,3))

I expect to send one image to the method called compute and get one feature vector, now I'm getting this problem::

image = cv2.imread("test.jpg")
vector = ColorLayoutDescriptor.compute(image)

TypeError: compute() missing 1 required positional argument: 'img'

thanks so much.

Answer 1

ColorLayoutDescriptor is a class, so you first have to create an instance of the class:

cld = ColorLayoutDescriptor()
cld.compute(image)