python opencv 学习笔记

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)