如何用Chaquopy和openCV打开安卓相机？

2023-04-26 02:21| 来源: 网络整理| 查看: 265

我为一个图像识别任务执行了Python代码，效果很好，但当我用Chaquopy把它实现在一个安卓应用程序中时，它却不工作了。这是因为Python代码中的第一个指令旨在通过这个指令cap = cv2.videoCapture(0)来打开摄像头，而这个指令在安卓设备上不起作用。我还在androidManifest.xml中添加了相机和存储的权限。这是我的Java代码。

public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (! Python.isStarted()) { Python.start(new AndroidPlatform(this)); } Python py = Python.getInstance(); PyObject pym =py.getModule("MyPythonClass"); }

而这是Python代码（类的名称是MyPythonClass.py）。

import numpy as np from skimage.transform import pyramid_gaussian from imutils.object_detection import non_max_suppression import imutils from skimage.feature import hog from sklearn.externals import joblib from skimage import color import matplotlib.pyplot as plt import os import glob from imutils.video import VideoStream from imutils.video import FPS import numpy as np import argparse import time import cv2 min_wdw_sz = [68, 124] step_size = [10, 10] orientations = 9 pixels_per_cell = [6, 6] cells_per_block = [2, 2] visualize = False normalize = True threshold = .3 clf = joblib.load(os.path.join('/storage/emulated/0/Download/', 'svm.model')) def sliding_window(image, window_size, step_size): for y in range(0, image.shape[0], step_size[1]): for x in range(0, image.shape[1], step_size[0]): yield (x, y, image[y: y + window_size[1], x: x + window_size[0]]) webcam = cv2.VideoCapture (0) # loop over the frames from the video stream while True: ret, frame = webcam.read() im = imutils.resize(frame, width=min(300, frame.shape[1])) orig = im.copy() min_wdw_sz = (64, 128) step_size = (10, 10) downscale = 1.25 #List to store the detections detections = [] #The current scale of the image scale = 0 for im_scaled in pyramid_gaussian(im, downscale = downscale): #The list contains detections at the current scale if im_scaled.shape[0] < min_wdw_sz[1] or im_scaled.shape[1] < min_wdw_sz[0]: break for (x, y, im_window) in sliding_window(im_scaled, min_wdw_sz, step_size): if im_window.shape[0] != min_wdw_sz[1] or im_window.shape[1] != min_wdw_sz[0]: continue im_window = color.rgb2gray(im_window) fd = hog(im_window, orientations, pixels_per_cell, cells_per_block, transform_sqrt=normalize) fd = fd.reshape(1, -1) pred = clf.predict(fd) if pred == 1: if clf.decision_function(fd) > 1: detections.append((int(x * (downscale**scale)), int(y * (downscale**scale)), clf.decision_function(fd), int(min_wdw_sz[0] * (downscale**scale)), int(min_wdw_sz[1] * (downscale**scale)))) scale += 1 clone = im.copy() # loop over the detections for (x_tl, y_tl, _, w, h) in detections: cv2.rectangle(im, (x_tl, y_tl), (x_tl + w, y_tl + h), (0, 255, 0), thickness = 2) rects = np.array([[x, y, x + w, y + h] for (x, y, _, w, h) in detections]) sc = [score[0] for (x, y, score, w, h) in detections] sc = np.array(sc) pick = non_max_suppression(rects, probs = sc, overlapThresh = 0.3) # print "shape, ", pick.shape for(xA, yA, xB, yB) in pick: cv2.rectangle(clone, (xA, yA), (xB, yB), (0, 45, 255), 2) # show the output frame cv2.imshow("Frame", clone)

这就是logact显示的错误。

java.lang.RuntimeException: Unable to start activity ComponentInfo{com........MainActivity}: com.chaquo.python.PyException: AttributeError: 'NoneType' object has no attribute 'shape' at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3319) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3415) at android.app.ActivityThread.access$1100(ActivityThread.java:229) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:7325) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) Caused by: com.chaquo.python.PyException: AttributeError: 'NoneType' object has no attribute 'shape' at .(/android_asset/chaquopy/app.zip/MyPythonClass.py:44)

EDIT :

权限（存储和相机）在手机中被授予。以及：minSdkV版本19 targetSdkV版本 28 编译SdkV版本 28

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