python + opencv在imagepy中开发USB相机插件

最近发现了imagepy这个宝藏，正好师兄毕业了，留下了一个USB相机，为了方便使用，结合imagepy开发一个USB相机插件，在此记录一下。
持续更新……

imagepy

imagepy github
ImagePy是一个用Python编写的开源图像处理框架。其UI界面、图像数据结构和表数据结构分别是基于wxpython的，基于numpy的和基于panda的。此外，它支持任何基于Numpy和Pandas的插件，兼容scipy、Ndimage, scikit-image, simpleitk, opencv等图像处理库。

imagepy使开发者不需要关注UI和交互设计，而只关注算法本身，对于学习图像处理来说简直太舒服了！

开发USB相机插件

搭建界面、绑定功能

相机界面比较简单，满足日常使用就行，比如打开相机、接收画面、读取一帧、关闭相机

import wx, numpy as np
from sciapp.object import Image
import cv2.cv2 as cv2


class Plugin(wx.Panel):
    title = 'cameraSimple'

    def __init__(self, parent, app=None):
        wx.Panel.__init__(self, parent)
        self.app = app
        sizer = wx.BoxSizer(wx.VERTICAL)
        self.lable = wx.StaticText(self, wx.ID_ANY, 'Camera Demo')
        self.lable.Wrap(-1)
        sizer.Add(self.lable, 0, wx.ALIGN_CENTER | wx.ALL, 5)

        self.btn_open = wx.Button(self, wx.ID_ANY, '打开相机')
        sizer.Add(self.btn_open, 0, wx.ALIGN_CENTER | wx.ALL, 5)

        self.btn_grapImgs = wx.Button(self, wx.ID_ANY, '接收画面')
        sizer.Add(self.btn_grapImgs, 0, wx.ALIGN_CENTER | wx.ALL, 5)

        self.btn_close = wx.Button(self, wx.ID_ANY, '关闭相机')
        sizer.Add(self.btn_close, 0, wx.ALIGN_CENTER | wx.ALL, 5)

        self.btn_grapOne = wx.Button(self, wx.ID_ANY, '获取一帧')
        sizer.Add(self.btn_grapOne, 0, wx.ALIGN_CENTER | wx.ALL, 5)

        self.SetSizer(sizer)
        self.Layout()
        self.Fit()
        self.btn_open.Bind(wx.EVT_BUTTON, self.open)
        self.btn_grapImgs.Bind(wx.EVT_BUTTON, self.grapImgs)
        self.btn_close.Bind(wx.EVT_BUTTON, self.close)
        self.btn_grapOne.Bind(wx.EVT_BUTTON, self.frame)


        self.isopen = False

界面：

哈哈，比较简陋，自己够用就行了 U•ェ•*U

开发功能、

    def grapImgs(self, event=None):
        print('grap Images......')
        self.app.info('grap Images......')
        while True:
            if self.isopen:
                hasData, img = self.camera.read()
                if hasData:
                    cv2.imshow('camera', img)
                    cv2.waitKey(10)
                else:
                    self.app.info('no data!')
                    print('no data!')
                    break
            else:
                self.app.info('please open a camera!')
                print('please open a camera!')
                break

    def frame(self, event=None):
        if self.isopen:
            hasData, img = self.camera.read()
            if hasData:
                myimg = Image([img[..., ::-1]])
                self.app.show_img(myimg, 'frame')
                print('grap One Image......')
                self.app.info('grap One Image......')
            else:
                self.app.info('no data!')
                print('no data!')
        else:
            self.app.info('please open a camera!')
            print('please open a camera!')

    def open(self, event=None):
        if self.isopen:
            self.app.info('camera has opened!')
            print('camera has opened!')
        else:
            self.camera = cv2.VideoCapture(0, cv2.CAP_DSHOW)
            self.isopen = True
            self.app.info('camera opened!')
            print('camera opened!')

    def close(self, event=None):
        if self.isopen:
            self.isopen = False
            cv2.waitKey(20)
            self.camera.release()
            cv2.destroyAllWindows()
            self.app.info('camera closed!')
            print('camera closed!')
        else:
            self.app.info('camera has closed!')
            print('camera has closed!')

结果展示

后续考虑开发HIK Camera、Basler Camera相机插件。
ヾ(◍°∇°◍)ﾉﾞ

错误解决

[ WARN:0] terminating async callback

解决方法：

camera = cv2.VideoCapture(camera_port,cv2.CAP_DSHOW)

参考：https://stackoverflow.com/questions/53888878/cv2-warn0-terminating-async-callback-when-attempting-to-take-a-picture