webcam feed with opencv and tkinter

Question

I wrote a program in python using opencv and tkinter that provides display a video webcam feed and I can do snapshot. I have one button called as snapshot and file name saved as timestamp, but I want to save file name by my own(user) instead of timestamp. I don't have any idea, I am beginner in python and tkinter. Can you please help me?

following is my photoboothapp code:

from __future__ import print_function
from PIL import Image
from PIL import ImageTk
import tkinter as tki
import threading
import datetime
import imutils
import cv2
import os

class PhotoBoothApp:
    def __init__(self, vs, outputPath):
        self.vs = vs
        self.outputPath = outputPath
        self.frame = None
        self.thread = None
        self.stopEvent = None

        # initialize the root window and image panel
        self.root = tki.Tk()
        self.panel = None

        # create a button, that when pressed, will take the current
        # frame and save it to file
                btm = tki.Button(self.root, text="name",command=callback)
        btn = tki.Button(self.root, text="Snapshot!",
            command=self.takeSnapshot)

                #btm = tki.Button(self.root, text="name",command=callback)

                #btm=tki.Button(self.root,text="name",command=callback)
        btn.pack(side="bottom", fill="both", expand="yes", padx=10,
            pady=10)
                #btm.pack(side="bottom",fill="both",expand="yes", padx=15,pady=15)
        # start a thread that constantly pools the video sensor for
        # the most recently read frame
        self.stopEvent = threading.Event()
        self.thread = threading.Thread(target=self.videoLoop, args=())
        self.thread.start()

        # set a callback to handle when the window is closed
        self.root.wm_title("PyImageSearch PhotoBooth")
        self.root.wm_protocol("WM_DELETE_WINDOW", self.onClose)

    def videoLoop(self):
        # DISCLAIMER:
        # I'm not a GUI developer, nor do I even pretend to be. This
        # try/except statement is a pretty ugly hack to get around
        # a RunTime error that Tkinter throws due to threading
        try:
            # keep looping over frames until we are instructed to stop
            while not self.stopEvent.is_set():
                # grab the frame from the video stream and resize it to
                # have a maximum width of 300 pixels
                self.frame = self.vs.read()
                self.frame = imutils.resize(self.frame, width=300)

                # OpenCV represents images in BGR order; however PIL
                # represents images in RGB order, so we need to swap
                # the channels, then convert to PIL and ImageTk format
                image = cv2.cvtColor(self.frame, cv2.COLOR_BGR2RGB)
                image = Image.fromarray(image)
                image = ImageTk.PhotoImage(image)

                # if the panel is not None, we need to initialize it
                if self.panel is None:
                    self.panel = tki.Label(image=image)
                    self.panel.image = image
                    self.panel.pack(side="left", padx=10, pady=10)

                # otherwise, simply update the panel
                else:
                    self.panel.configure(image=image)
                    self.panel.image = image

        except RuntimeError as e:
            print("[INFO] caught a RuntimeError")

    def takeSnapshot(self):
        # grab the current timestamp and use it to construct the
        # output path
        ts = datetime.datetime.now()
        filename = "{}.jpg".format(ts.strftime("%Y-%m-%d_%H-%M-%S"))
        p = os.path.sep.join((self.outputPath, filename))

        # save the file
        cv2.imwrite(p, self.frame.copy())
        print("[INFO] saved {}".format(filename))

    def onClose(self):
        # set the stop event, cleanup the camera, and allow the rest of
        # the quit process to continue
        print("[INFO] closing...")
        self.stopEvent.set()
        self.vs.stop()
        self.root.quit()

Check out this [SO link](https://stackoverflow.com/questions/19476232/save-file-dialog-in-tkinter). `asksaveasfilename()` will open an dialog box which will do stuff you wanna do and you add a button where ever you want and onclicking that button this function can be called inside your `takeSnapshot()`. — Shashank Singh, Feb 22 '18 at 06:39
i try it but i can't solve this problem..i'm beginner in python — roik sail, Feb 22 '18 at 06:58
What is the error you are getting when you try that...what was the program that you wrote update it in your post question. Don't worry someone will definitely help you — Shashank Singh, Feb 22 '18 at 07:00
my problem is that how add button below of snapshot botton??i don't know how i define botton!! — roik sail, Feb 22 '18 at 07:08
In your code this line created a button `btn = tki.Button(self.root, text="Snapshot!", command=self.takeSnapshot)` what it means is its `parent` is `root` the `text` on the button will appear `Snapshot!` and it will call the `takeSnapshot()` when clicked. — Shashank Singh, Feb 22 '18 at 07:14
ok...for example bmm = tki.Button(self.root, text="name!",command = )...what is it in blank in command?? — roik sail, Feb 22 '18 at 07:21
Its not a blank the function's call is in multiple line. That is a single one line. — Shashank Singh, Feb 22 '18 at 07:35
when add bmm=tki.Button(self.root,text="text",command=self.takeSnapshot) then text and snapshot will act similar — roik sail, Feb 22 '18 at 08:13
Yes it will add a button with the text on the button from `Snapshot!` to `text` — Shashank Singh, Feb 22 '18 at 08:52

Saurav Panda · Answer 1 · 2018-02-22T21:16:31.120

You can use the Entry widget of tkinter python.

above the button add this lines.

Text=Entry(self.root)
Text.pack()

and in takeSnapshot() function do this while writing.

p=os.path.sep.join((Text.get(), filename))

I have edited your code for better understanding.

from __future__ import print_function
from PIL import Image
from PIL import ImageTk
import tkinter as tki
import threading
import datetime
import imutils
import cv2
import os

class PhotoBoothApp:
    def __init__(self, vs, outputPath):
        self.vs = vs
        self.outputPath = outputPath
        self.frame = None
        self.thread = None
        self.stopEvent = None

        # initialize the root window and image panel
        self.root = tki.Tk()
        self.panel = None

        # create a button, that when pressed, will take the current
        # frame and save it to file
        btm = tki.Button(self.root, text="name",command=callback)
        Text=Entry(self.root)
        Text.pack()
        btn = tki.Button(self.root, text="Snapshot!",
            command=self.takeSnapshot)

                #btm = tki.Button(self.root, text="name",command=callback)

                #btm=tki.Button(self.root,text="name",command=callback)
        btn.pack(side="bottom", fill="both", expand="yes", padx=10,
            pady=10)
                #btm.pack(side="bottom",fill="both",expand="yes", padx=15,pady=15)
        # start a thread that constantly pools the video sensor for
        # the most recently read frame
        self.stopEvent = threading.Event()
        self.thread = threading.Thread(target=self.videoLoop, args=())
        self.thread.start()

        # set a callback to handle when the window is closed
        self.root.wm_title("PyImageSearch PhotoBooth")
        self.root.wm_protocol("WM_DELETE_WINDOW", self.onClose)

    def videoLoop(self):
        # DISCLAIMER:
        # I'm not a GUI developer, nor do I even pretend to be. This
        # try/except statement is a pretty ugly hack to get around
        # a RunTime error that Tkinter throws due to threading
        try:
            # keep looping over frames until we are instructed to stop
            while not self.stopEvent.is_set():
                # grab the frame from the video stream and resize it to
                # have a maximum width of 300 pixels
                self.frame = self.vs.read()
                self.frame = imutils.resize(self.frame, width=300)

                # OpenCV represents images in BGR order; however PIL
                # represents images in RGB order, so we need to swap
                # the channels, then convert to PIL and ImageTk format
                image = cv2.cvtColor(self.frame, cv2.COLOR_BGR2RGB)
                image = Image.fromarray(image)
                image = ImageTk.PhotoImage(image)

                # if the panel is not None, we need to initialize it
                if self.panel is None:
                    self.panel = tki.Label(image=image)
                    self.panel.image = image
                    self.panel.pack(side="left", padx=10, pady=10)

                # otherwise, simply update the panel
                else:
                    self.panel.configure(image=image)
                    self.panel.image = image

        except RuntimeError as e:
            print("[INFO] caught a RuntimeError")

    def takeSnapshot(self):
        # grab the current timestamp and use it to construct the
        # output path
        ts = datetime.datetime.now()
        filename = "{}.jpg".format(ts.strftime("%Y-%m-%d_%H-%M-%S"))
        p = os.path.sep.join((Text.get(), filename))

        # save the file
        cv2.imwrite(p, self.frame.copy())
        print("[INFO] saved {}".format(filename))

    def onClose(self):
        # set the stop event, cleanup the camera, and allow the rest of
        # the quit process to continue
        print("[INFO] closing...")
        self.stopEvent.set()
        self.vs.stop()
        self.root.quit()

thank you for your help,this code not worked,first problem is where i haven't webcam running,,but it worked before,,secondly i got following error when i used name: p = os.path.sep.join((self.outputPath, filename)) NameError: name 'filename' is not defined — roik sail, Feb 22 '18 at 06:13

webcam feed with opencv and tkinter

1 Answers1