Source code for Laplace_Screen

import cv2
import numpy as np
import os
import tempfile
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog, QFileDialog,
                             QLabel, QPushButton, QStackedWidget, QVBoxLayout,
                             QWidget)
from PyQt5.uic import loadUi
from skimage.util import random_noise



[docs]class Ui_Dialog_8(object): def __init__(self): """ Creation of a temporary image which helps in displaying the given image onto the GUI label. """ self.output_image = None with tempfile.NamedTemporaryFile(suffix=".png") as f: self.buffer_image_filename = f.name def __del__(self): """ Deletion of the temporary image which helped in displaying the given image onto the GUI label. """ if self.output_image is not None: os.remove(self.buffer_image_filename)
[docs] def setupUi(self, Dialog_8): """ setupUI defined for the screen auto-generated by the PyQt5 editor. """ self.counter = 0 Dialog_8.setObjectName("Dialog_8") Dialog_8.resize(1366, 800) self.scrollArea = QtWidgets.QScrollArea(Dialog_8) self.scrollArea.setGeometry(QtCore.QRect(80, 40, 571, 561)) self.scrollArea.setWidgetResizable(True) self.scrollArea.setObjectName("scrollArea") self.scrollAreaWidgetContents = QtWidgets.QWidget() self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 569, 559)) self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents") self.label = QtWidgets.QLabel(self.scrollAreaWidgetContents) self.label.setGeometry(QtCore.QRect(10, 20, 571, 561)) self.label.setText("") self.label.setObjectName("label") self.scrollArea.setWidget(self.scrollAreaWidgetContents) self.label_3 = QtWidgets.QLabel(Dialog_8) self.label_3.setGeometry(QtCore.QRect(660, 300, 61, 31)) self.label_3.setStyleSheet("font: 22pt \"MS Shell Dlg 2\";") self.label_3.setAlignment(QtCore.Qt.AlignCenter) self.label_3.setObjectName("label_3") self.scrollArea_2 = QtWidgets.QScrollArea(Dialog_8) self.scrollArea_2.setGeometry(QtCore.QRect(730, 40, 571, 561)) self.scrollArea_2.setWidgetResizable(True) self.scrollArea_2.setObjectName("scrollArea_2") self.scrollAreaWidgetContents_2 = QtWidgets.QWidget() self.scrollAreaWidgetContents_2.setGeometry(QtCore.QRect(0, 0, 569, 559)) self.scrollAreaWidgetContents_2.setObjectName("scrollAreaWidgetContents_2") self.label_2 = QtWidgets.QLabel(self.scrollAreaWidgetContents_2) self.label_2.setGeometry(QtCore.QRect(10, 20, 571, 561)) self.label_2.setText("") self.label_2.setObjectName("label_2") self.scrollArea_2.setWidget(self.scrollAreaWidgetContents_2) self.Save_As = QtWidgets.QPushButton(Dialog_8) self.Save_As.setGeometry(QtCore.QRect(900, 660, 403, 81)) self.Save_As.setObjectName("Save_As") self.label_5 = QtWidgets.QLabel(Dialog_8) self.label_5.setGeometry(QtCore.QRect(400, 740, 581, 41)) self.label_5.setStyleSheet("color: rgb(255, 0, 0);") self.label_5.setText("") self.label_5.setAlignment(QtCore.Qt.AlignCenter) self.label_5.setObjectName("label_5") self.Open_Image_Button = QtWidgets.QPushButton(Dialog_8) self.Open_Image_Button.setGeometry(QtCore.QRect(90, 660, 401, 81)) self.Open_Image_Button.setObjectName("Open_Image_Button") self.retranslateUi(Dialog_8) QtCore.QMetaObject.connectSlotsByName(Dialog_8)
[docs] def retranslateUi(self, Dialog_8): """ Setting the UI layouts and components - labels, textfields, pushbuttons, etc. Also adding functionality for redirecting buttons to respective functions on being clicked. """ _translate = QtCore.QCoreApplication.translate Dialog_8.setWindowTitle(_translate("Dialog_8", "Laplace Edge Detection")) self.Open_Image_Button.setText(_translate("Dialog_8", "Open Image")) self.label_3.setText(_translate("Dialog_8", "=>")) self.Open_Image_Button.setText(_translate("Dialog_8", "Open Image")) self.Save_As.setText(_translate("Dialog_8", "Save As")) self.Open_Image_Button.clicked.connect(self.File_Select) self.Save_As.clicked.connect(self.Save_Directory)
[docs] def laplacian_filter(self, img, kernel_size=3): """ Laplace Filter applied to user input image when the function gets called. Returns: img: An image which contains the Laplacian edge of the user input image. """ # Define the Laplacian kernel kernel = np.array([ [0, 1, 0], [1, -4, 1], [0, 1, 0] ], dtype=np.float32) # Pad the image with zeros padded_img = np.pad(img, pad_width=kernel_size//2, mode='constant') # Apply the Laplacian filter to the image filtered_img = np.zeros_like(img, dtype=np.float32) for i in range(img.shape[0]): for j in range(img.shape[1]): filtered_img[i, j] = np.sum(padded_img[i:i+kernel_size, j:j+kernel_size] * kernel) # Normalize the filtered image to the range [0, 255] filtered_img = cv2.normalize(filtered_img, None, alpha=0, beta=255, norm_type=cv2.NORM_MINMAX, dtype=cv2.CV_8U) return filtered_img
[docs] def File_Select(self): """ Main Logical function which does the following: 1. Helps user in choosing input for image file (supported file formats - .jpg, .jpeg, .gif, .png) 2. Error handling if user doesn't choose supported file. 3. Displays the image onto the GUI label layout (if size exceeds, then scroll bars appear in the Label). 4. The user can Save the generated image in the directory they want on the machine. """ file_name, _ = QFileDialog.getOpenFileName(None, 'Open Image File', r"<Default dir>", "Image files (*.jpg *.jpeg *.gif *.png)") if file_name: self.label.setPixmap(QPixmap(file_name)) self.counter += 1 img = cv2.imread(file_name, cv2.IMREAD_GRAYSCALE) # Apply the Laplacian filter to the image self.output_image = self.laplacian_filter(img) Laplacian_File_Name = self.buffer_image_filename cv2.imwrite(Laplacian_File_Name, self.output_image) # self.label_2.setPixmap(QPixmap(Laplacian_File_Name)) lay = QtWidgets.QVBoxLayout(self.scrollAreaWidgetContents) lay_2 = QtWidgets.QVBoxLayout(self.scrollAreaWidgetContents_2) lay.setContentsMargins(0, 0, 0, 0) lay_2.setContentsMargins(0, 0, 0, 0) lay.addWidget(self.label) lay_2.addWidget(self.label_2) self.label.setPixmap(QPixmap(file_name)) self.label_2.setPixmap(QPixmap(Laplacian_File_Name)) self.label_5.setText("") # self.scrollArea.setWidgetResizable(True) # self.scrollArea_2.setWidgetResizable(True) self.label.setAlignment(QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter) self.label_2.setAlignment(QtCore.Qt.AlignHCenter | QtCore.Qt.AlignVCenter) self.Open_Image_Button.setEnabled(False)
[docs] def Save_Directory(self): """ Helps in saving and writing the image in the directory the user wants to save in. """ option = QFileDialog.Options() if self.counter > 0: save_as_path = QFileDialog.getSaveFileName(None, 'Open Image File', r"Laplacian Image", "Image files (*.jpg *.jpeg *.gif *.png)") if save_as_path[0].__len__() > 0: cv2.imwrite(save_as_path[0], self.output_image) else: self.label_5.setText("Please select a file first!")
if __name__ == "__main__": import sys app = QtWidgets.QApplication(sys.argv) Dialog_8 = QtWidgets.QDialog() ui = Ui_Dialog_8() ui.setupUi(Dialog_8) Dialog_8.show() sys.exit(app.exec_())