vault backup: 2022-09-26 18:39:43

Affected files:
.obsidian/workspace
03. 資料收集/HTTP Server/Nginx.md
03. 資料收集/Hobby/RC.md
03. 資料收集/Hobby/模型/Traxxas Sledge.md
03. 資料收集/Hobby/模型/舊化作例.md
03. 資料收集/Hobby/軍武/虎式.md
03. 資料收集/Programming/COM/20210726 - COM Interface.md
03. 資料收集/Programming/DB/MySQL.md
03. 資料收集/Programming/DB/sqlite.md
03. 資料收集/Programming/Design Pattern.md
03. 資料收集/Programming/FFMPEG/00. Introduction.md
03. 資料收集/Programming/FFMPEG/01. Setup.md
03. 資料收集/Programming/FFMpeg.md
03. 資料收集/Programming/Flask.md
03. 資料收集/Programming/Media Foundation/20210604 - Windows media foundation.md
03. 資料收集/Programming/OpenCV.md
03. 資料收集/Programming/OpenGL.md
03. 資料收集/Programming/Python/argparse.ArgumentParser.md
03. 資料收集/Programming/Python/decorator.md
03. 資料收集/Programming/Python/logging.md
03. 資料收集/Programming/Python/opencv.md
03. 資料收集/Programming/Python/subprocess.md
03. 資料收集/Programming/Python/threading.md
03. 資料收集/Programming/Python/tkinter.md
03. 資料收集/Programming/Python/檢測工具.md
03. 資料收集/Programming/QT/Dropdown button.md
03. 資料收集/Programming/QT/QVariant.md
03. 資料收集/Programming/QT/Qt.md
03. 資料收集/Programming/Qt.md
03. 資料收集/Programming/UML.md
03. 資料收集/Programming/演算法.md
03. 資料收集/架站/03. Trojan.md
03. 資料收集/架站/Gitea.md
03. 資料收集/架站/HTTP Server/Apache.md
03. 資料收集/架站/HTTP Server/Nginx/Reverse Proxy(Layer4).md
03. 資料收集/架站/Pelican blog.md
03. 資料收集/架站/Proxmox VE.md
03. 資料收集/架站/SWAG Reverse proxy.md
03. 資料收集/架站/Storj.md
03. 資料收集/架站/Trojan.md
03. 資料收集/科技/802.11.md
03. 資料收集/科技/HDR Sensor.md
03. 資料收集/科技/量子電腦.md
03. 資料收集/科技/鋰電池.md
03. 資料收集/軟體工具/IPFS.md
03. 資料收集/軟體工具/MkDocs.md
03. 資料收集/軟體工具/Obsidian.md
03. 資料收集/軟體工具/docker.md
03. 資料收集/軟體工具/git/apply.md
03. 資料收集/軟體工具/git/submodule.md

03. 資料收集/Programming/Python/opencv.md

@@ -0,0 +1,61 @@
+### 將camera包裝成class
+```python
+class CameraCv(object):
+    def __init__(self, videoSource=0):
+        self.videoSource = videoSource
+        self.camera = None
+        self.cameraWidth = 0
+        self.cameraHeight = 0
+        self.cameraPreviewThreadHandle = None
+        self.cameraPreviewThreadStopEvent = threading.Event()
+        self.lastframeRGB = None
+        self.latestFrame = None
+
+    def start(self):
+        print("Open Camera")
+        self.camera = cv2.VideoCapture(self.videoSource, cv2.CAP_DSHOW)
+        if not self.camera.isOpened():
+            raise ValueError("Unable to open video source {}".format(self.videoSource))
+
+        # Get video source width and height
+        self.cameraWidth  = self.camera.get(cv2.CAP_PROP_FRAME_WIDTH)
+        self.cameraHeight = self.camera.get(cv2.CAP_PROP_FRAME_HEIGHT)
+
+        self.cameraPreviewThreadStopEvent.clear()
+        self.cameraPreviewThreadHandle = threading.Thread(target=self.collectFrame, daemon=True, args=())
+        self.cameraPreviewThreadHandle.start()
+
+    def stop(self):
+        print("Close Camera")
+        self.cameraPreviewThreadStopEvent.set()
+        if self.camera.isOpened():
+            self.camera.release()
+            cv2.destroyAllWindows()
+
+    def collectFrame(self):
+        while True:
+            ret, frame = self.camera.read()
+            if ret:
+                # Return a boolean success flag and the current frame converted to BGR
+                self.lastframeRGB = frame
+                self.latestFrame = ImageTk.PhotoImage(image=Image.fromarray(cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)))
+
+            if self.cameraPreviewThreadStopEvent.is_set():
+                break
+
+            time.sleep(0.016)
+
+    def draw(self, container):
+        if self.latestFrame is not None:
+            container.imgtk = self.latestFrame
+            container.configure(image=self.latestFrame)
+
+    def read(self):
+        return self.camera.read()
+
+    def getLastFrameRgb(self):
+        return self.lastframeRGB
+
+    def saveFrame(self, filepath):
+        cv2.imwrite(filepath, self.getLastFrameRgb())
+```