qtcam 1.0.0

PyQt5 widget for OpenCV camera preview with multiple instantiation and real time image filtering.

qtcam

PyQt5 widget for OpenCV camera preview with multiple instantiation and real time image filtering.

This module contains the next classes:

• CameraDevice: Manages image capture and emits a signal when a new frame is available.
• CameraWidget: Implements a Qt widget for camera image preview.
• Filters: Implements some basic image filters.

Installation

pip install qtcam

Usage

Simple preview widget

from PyQt5.QtWidgets import QApplication

from qtcam import CameraDevice, CameraWidget

app = QApplication([])

widget = CameraWidget(CameraDevice())
widget.show()

app.exec_()

Multiple widget instances with image filtering

from PyQt5.QtWidgets import QApplication

from qtcam import CameraDevice, CameraWidget, Filter

app = QApplication([])

device = CameraDevice()
widget_1 = CameraWidget(device)
widget_1.show()

widget_2 = CameraWidget(device)
widget_2.add_filter(Filter.gray)
widget_2.show()

app.exec_()

Custom filtering

import cv2
from PyQt5.QtWidgets import QApplication

from qtcam import CameraDevice, CameraWidget

def custom_filter(frame):
    return cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

app = QApplication([])

widget = CameraWidget(CameraDevice())
widget.add_filter(custom_filter)
widget.show()

app.exec_()

Selecting another camera

Another camera can be selected by passing its index to CameraDevice (the default index is 0).

from qtcam import CameraDevice

device = CameraDevice(1)

Examples

• multiple_widgets.py: Multiple widget instances using some built-in filters.
• filter_tester.py: PyQt application using the widget to test all built-in filters.