python opencv 学习笔记

时间：2021-05-07 06:47:28

图片缩放

image=cv2.imread('test.jpg')
  res=cv2.resize(image,(32,32),interpolation=cv2.INTER_CUBIC)
  cv2.imshow('iker',res)
  cv2.imshow('image',image)
  cv2.waitKey(0)
  cv2.destoryAllWindows()

OpenCV与Python之图像的读入与显示以及利用Numpy的图像转换

mxnet图像转换为opencv的类型，保存

    img = mx.image.imdecode(s).asnumpy()

    # plt.imshow(img)

    # plt.title('id=' + str(i) + 'label=' + str(header.label))

    # plt.savefig("mxshow/label_" + str(header.label) + '_id_' + str(i) + ".jpg")

    # plt.pause(1)

    label = str(header.label)

    label = label.strip().split(".")[0]

    print("all num " + str(all) + " current index "+str(i)+" process "+str(i  * 100.0 / all)+"%")

    label_dir = os.path.join(decode_path, label)

    if not os.path.isdir(label_dir):  # Create the log directory if it doesn't exist

    	label_num += 1

    	os.makedirs(label_dir)

    X = img

    print(X.shape)

    X = cv2.cvtColor(X, cv2.COLOR_RGB2BGR)

    X = cv2.resize(X,(160,160), interpolation=cv2.INTER_CUBIC)

    cv2.imwrite(label_dir + "/label_" + str(label) + '_id_' + str(i) + ".jpg", X)

　　

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