生成灰度图二值图(原理).ipynb

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   "source": [
    "import cv2 \n",
    "import numpy as np  \n",
    "\t  \n",
    "image = cv2.imread('C:/Users/beichen/dataset/meihuameat/2.jpg')  \n",
    "#读取图片像素高宽  \n",
    "sp = image.shape  \n",
    "height = sp[0]  \n",
    "width = sp[1]  \n",
    "#创建同样高宽的画布  \n",
    "new = np.zeros((height,width,3), np.uint8)  \n",
    "#遍历每个像素  \n",
    "#使用加权平均法算得灰度图  \n",
    "for i in range(height):   \n",
    "    for j in range(width):   \n",
    "        new[i,j] = 0.3 * image[i,j][0] + 0.59 * image[i,j][1] + 0.11 * image[i,j][2]   \n",
    "  \n",
    "cv2.namedWindow('Image')  \n",
    "cv2.imshow('Image', new)  \n",
    "\t  \n",
    "cv2.imwrite(\"C:/Users/beichen/dataset/greyimg/2.jpg\", new)  \n",
    "  \n",
    "cv2.waitKey(0) \n",
    "cv2.destroyAllWindows() \n",
    "img = new\n",
    "ret, binary = cv2.threshold(img,127,255, cv2.THRESH_BINARY_INV)"
   ]
  }
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