如何使用OpenNI绑定在OpenCV中打印Kinect框架

时间:2018-08-22 16:39:51

标签: python opencv openni

我正在尝试使用OpenCV处理来自Kinect的深度图像。我正在使用Python和primesense的绑定(https://pypi.org/project/primesense/),但在显示我从openNI获得的图像时遇到了很多麻烦。我用

import numpy as np
import cv2
from primesense import openni2

openni2.initialize("./Redist")     # can also accept the path of the OpenNI     redistribution

dev = openni2.Device.open_any()

depth_stream = dev.create_color_stream()
depth_stream.start()

while(True):

    frame = depth_stream.read_frame()
    print(type(frame)) #prints <class 'primesense.openni2.VideoFrame'>

    frame_data = frame.get_buffer_as_uint8()
    print(frame_data) # prints <primesense.openni2.c_ubyte_Array_921600 object at 0x000002B3AF5F8848>

    image = np.array(frame_data, dtype=np.uint8) 


    print(type(image)) #prints <class 'numpy.ndarray'>
    print(image) #prints [12 24  3 ...  1  3 12], i guess this is the array that makes the image


    cv2.imshow('image', image)

depth_stream.stop()
openni2.unload()

这是输出即时消息,只是一个没有图像的窗口:

enter image description here

根本没有关于如何使用这些绑定的文档,因此,我在这里是一个盲点。我以为frame.get_buffer_as_uint8()给了我准备打印的数组,但它只返回了primesense.openni2.c_ubyte_Array_921600 object at 0x000002B3AF5F8848

实际上,我查看了绑定的代码,发现了这一点:

def get_buffer_as_uint8(self):
    return self.get_buffer_as(ctypes.c_uint8)
def get_buffer_as_uint16(self):
    return self.get_buffer_as(ctypes.c_uint16)
def get_buffer_as_triplet(self):
    return self.get_buffer_as(ctypes.c_uint8 * 3)

有人使用过此绑定吗?关于如何使它们工作的任何想法?预先谢谢你

1 个答案:

答案 0 :(得分:0)

我找到了解决方法:

您不必使用image = np.array(frame_data, dtype=np.uint8)来获取图像,而要使用frame_data = frame.get_buffer_as_uint16()。另外,我也无法正确设置图像形状。

以备将来参考

要使用Python的OpenNI绑定从深度相机(不是Kinect相机)中获取图像,并使用OpenCV处理该图像,请使用以下代码:

import numpy as np
import cv2
from primesense import openni2
from primesense import _openni2 as c_api

openni2.initialize("./Redist")     # can also accept the path of the OpenNI redistribution

dev = openni2.Device.open_any()

depth_stream = dev.create_depth_stream()
depth_stream.start()

while(True):

    frame = depth_stream.read_frame()
    frame_data = frame.get_buffer_as_uint16()

    img = np.frombuffer(frame_data, dtype=np.uint16)
    img.shape = (1, 480, 640)
    img = np.concatenate((img, img, img), axis=0)
    img = np.swapaxes(img, 0, 2)
    img = np.swapaxes(img, 0, 1)

    cv2.imshow("image", img)
    cv2.waitKey(34)


depth_stream.stop()
openni2.unload()

要使用彩色相机,可以改为使用dev.create_color_stream()