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Given the following text description, write Python code to implement the functionality described below step by step
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Description:
 Title
Step1:  Load Image As Greyscale
Step2:  Sharpen Image
Step3:  View Image
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Python Code:
# Load image
import cv2
import numpy as np
from matplotlib import pyplot as plt
Explanation: Title: Sharpen Images
Slug: sharpen_images
Summary: How to sharpen images using OpenCV in Python.   
Date: 2017-09-11 12:00
Category: Machine Learning
Tags: Preprocessing Images  
Authors: Chris Albon
Preliminaries
End of explanation
# Load image as grayscale
image = cv2.imread('images/plane_256x256.jpg', cv2.IMREAD_GRAYSCALE)
Explanation: Load Image As Greyscale
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# Create kernel
kernel = np.array([[0, -1, 0], 
                   [-1, 5,-1], 
                   [0, -1, 0]])
# Sharpen image
image_sharp = cv2.filter2D(image, -1, kernel)
Explanation: Sharpen Image
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# Show image
plt.imshow(image_sharp, cmap='gray'), plt.axis("off")
plt.show()
Explanation: View Image
End of explanation
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