如何将此Matplotlib绘图保存为Numpy数组？

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure

fig = Figure()
canvas = FigureCanvas(fig)

# 绘制图形
ax = fig.add_subplot(111)
x = np.linspace(0, 2 * np.pi, 100)
y = np.sin(x)
ax.plot(x, y)

canvas.draw()
width, height = fig.get_size_inches() * fig.get_dpi()
image = np.frombuffer(canvas.tostring_rgb(), dtype='uint8').reshape(int(height), int(width), 3)