module 'cv2' has no attribute 'SIFT_score'

非常抱歉，我之前给出的代码中有一个错误。OpenCV库中没有名为`SIFT_score`的函数来计算SSIM。正确的方法是使用`compare_ssim`函数来计算SSIM。以下是更新后的代码：

import cv2
import numpy as np
from skimage.metrics import structural_similarity as ssim

def calculate_psnr(original_image, compressed_image):
    mse = np.mean((original_image - compressed_image) ** 2)
    if mse == 0:
        return float('inf')
    max_pixel = 255.0
    psnr = 20 * np.log10(max_pixel / np.sqrt(mse))
    return psnr

def calculate_ssim(original_image, compressed_image):
    grayA = cv2.cvtColor(original_image, cv2.COLOR_BGR2GRAY)
    grayB = cv2.cvtColor(compressed_image, cv2.COLOR_BGR2GRAY)
    ssim_score = ssim(grayA, grayB, data_range=grayB.max() - grayB.min())
    return ssim_score

# 读取原始图像和压缩后的图像
original_image = cv2.imread('original_image.jpg')
compressed_image = cv2.imread('compressed_image.jpg')

# 计算PSNR和SSIM
psnr = calculate_psnr(original_image, compressed_image)
ssim = calculate_ssim(original_image, compressed_image)

print(f"PSNR: {psnr} dB")
print(f"SSIM: {ssim}")

请确保将 `original_image.jpg` 和 `compressed_image.jpg` 替换为你实际的图像文件路径。这段代码将计算彩色图像的PSNR和SSIM，并输出结果。

非常抱歉给你带来了困扰，希望这次的回答对你有帮助。如果还有其他问题，请随时提问。