Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
524 views
in Technique[技术] by (71.8m points)

python - Opencv integration with wxpython

I just wanted to integrate the opencv video stream from my web cam into a more complex gui than highgui can offer, nothing fancy just a couple of buttons and something else, however it's proven to be not that trivial. I can't find any base example from which I can start designing the gui. I tried converting this code to the new opencv interface with quite a poor result. I'm a new to opencv, numpy and gui design. Some time does stream the video but most of the time it just hangs there. I guess my one mistake might be in wx.BitmapFromBuffer(col, row, img) since in the older version they used pil image format and now it's using numpy arrays so in the original code the used the pil function "imageData", instead of passing directly the numpy array as I'm doing. Any help it's really appreciated. color_channels_pic

This is my code conversion.

import wx
import cv2

class MyFrame(wx.Frame):
   def __init__(self, parent):
       wx.Frame.__init__(self, parent)
       self.displayPanel = wx.Panel(self)
       self.displayPanel.SetSize(wx.Size(800,640))

       self.cam = cv2.VideoCapture(1)
       self.cam.set(3, 640)
       self.cam.set(4, 480)
       ret, img = self.cam.read()

       cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
       row, col, x = img.shape
       self.SetSize((col,row))
       self.bmp = wx.BitmapFromBuffer(col, row, img)
       self.displayPanel.Bind(wx.EVT_PAINT, self.onPaint)

       self.playTimer = wx.Timer(self)
       self.Bind(wx.EVT_TIMER, self.onNextFrame)

       self.playTimer.Start(1000/15)

    def onPaint(self, evt):
        if self.bmp:
            dc = wx.BufferedPaintDC(self.displayPanel)
            self.PrepareDC(dc)
            dc.DrawBitmap(self.bmp, 0, 0, True)
        evt.Skip()

    def onNextFrame(self, evt):
        ret, img = self.cam.read()
        if ret == True:
            cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
            self.bmp.CopyFromBuffer(img)
            self.displayPanel.Refresh()
        evt.Skip()

if __name__=="__main__":
    app = wx.App()
    MyFrame(None).Show()
    app.MainLoop()
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

The following example code works fine for me under OS X, but I've had tiny surprises with wx across platforms. It is nearly the same code, the difference is that the result from cvtColor is reassigned, and a subclass of wx.Panel (which is the important part) was added.

import wx
import cv, cv2

class ShowCapture(wx.Panel):
    def __init__(self, parent, capture, fps=15):
        wx.Panel.__init__(self, parent)

        self.capture = capture
        ret, frame = self.capture.read()

        height, width = frame.shape[:2]
        parent.SetSize((width, height))
        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

        self.bmp = wx.BitmapFromBuffer(width, height, frame)

        self.timer = wx.Timer(self)
        self.timer.Start(1000./fps)

        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_TIMER, self.NextFrame)


    def OnPaint(self, evt):
        dc = wx.BufferedPaintDC(self)
        dc.DrawBitmap(self.bmp, 0, 0)

    def NextFrame(self, event):
        ret, frame = self.capture.read()
        if ret:
            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
            self.bmp.CopyFromBuffer(frame)
            self.Refresh()


capture = cv2.VideoCapture(0)
capture.set(cv.CV_CAP_PROP_FRAME_WIDTH, 320)
capture.set(cv.CV_CAP_PROP_FRAME_HEIGHT, 240)

app = wx.App()
frame = wx.Frame(None)
cap = ShowCapture(frame, capture)
frame.Show()
app.MainLoop()

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...