本文介紹了如何結(jié)合這兩個(gè)代碼?(python圖像查看器+鼠標(biāo)拖動(dòng)圖像ROI裁剪)的處理方法，對大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！
問題描述
我是 Python 和 PyQt 的初學(xué)者.我嘗試基于 acbetter 的代碼創(chuàng)建圖像查看器，并希望添加圖像裁剪功能.使用這兩個(gè)代碼，最終我想創(chuàng)建一個(gè)代碼，我可以在其中打開某個(gè)圖像并裁剪圖像的特定部分并將其顯示在另一個(gè)窗口中.您想幫忙如何組合這兩個(gè)代碼嗎?
- acbetter 的圖片查看器代碼
I'm beginner in Python and PyQt. I try to create image viewer based on acbetter's code and want to add image crop function. Using these two codes, ultimately I want to create a code in which I can open a certain image and crop specific part of the image and show it in another window. Would you like to help how to combine these two codes?
- acbetter's image viewer code https://gist.github.com/acbetter/32c575803ec361c3e82064e60db4e3e0
from PyQt5.QtCore import Qt from PyQt5.QtGui import QImage, QPixmap, QPalette, QPainter from PyQt5.QtPrintSupport import QPrintDialog, QPrinter from PyQt5.QtWidgets import QLabel, QSizePolicy, QScrollArea, QMessageBox, QMainWindow, QMenu, QAction, qApp, QFileDialog class QImageViewer(QMainWindow): def __init__(self): super().__init__() self.printer = QPrinter() self.scaleFactor = 0.0 self.imageLabel = QLabel() self.imageLabel.setBackgroundRole(QPalette.Base) self.imageLabel.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored) self.imageLabel.setScaledContents(True) self.scrollArea = QScrollArea() self.scrollArea.setBackgroundRole(QPalette.Dark) self.scrollArea.setWidget(self.imageLabel) self.scrollArea.setVisible(False) self.setCentralWidget(self.scrollArea) self.createActions() self.createMenus() self.setWindowTitle("Image Viewer") self.resize(800, 600) def open(self): options = QFileDialog.Options() # fileName = QFileDialog.getOpenFileName(self, "Open File", QDir.currentPath()) fileName, _ = QFileDialog.getOpenFileName(self, 'QFileDialog.getOpenFileName()', '', 'Images (*.png *.jpeg *.jpg *.bmp *.gif)', options=options) if fileName: image = QImage(fileName) if image.isNull(): QMessageBox.information(self, "Image Viewer", "Cannot load %s." % fileName) return self.imageLabel.setPixmap(QPixmap.fromImage(image)) self.scaleFactor = 1.0 self.scrollArea.setVisible(True) self.printAct.setEnabled(True) self.fitToWindowAct.setEnabled(True) self.updateActions() if not self.fitToWindowAct.isChecked(): self.imageLabel.adjustSize() def print_(self): dialog = QPrintDialog(self.printer, self) if dialog.exec_(): painter = QPainter(self.printer) rect = painter.viewport() size = self.imageLabel.pixmap().size() size.scale(rect.size(), Qt.KeepAspectRatio) painter.setViewport(rect.x(), rect.y(), size.width(), size.height()) painter.setWindow(self.imageLabel.pixmap().rect()) painter.drawPixmap(0, 0, self.imageLabel.pixmap()) def zoomIn(self): self.scaleImage(1.25) def zoomOut(self): self.scaleImage(0.8) def normalSize(self): self.imageLabel.adjustSize() self.scaleFactor = 1.0 def fitToWindow(self): fitToWindow = self.fitToWindowAct.isChecked() self.scrollArea.setWidgetResizable(fitToWindow) if not fitToWindow: self.normalSize() self.updateActions() def about(self): QMessageBox.about(self, "About Image Viewer", "<p>The <b>Image Viewer</b> example shows how to combine " "QLabel and QScrollArea to display an image. QLabel is " "typically used for displaying text, but it can also display " "an image. QScrollArea provides a scrolling view around " "another widget. If the child widget exceeds the size of the " "frame, QScrollArea automatically provides scroll bars.</p>" "<p>The example demonstrates how QLabel's ability to scale " "its contents (QLabel.scaledContents), and QScrollArea's " "ability to automatically resize its contents " "(QScrollArea.widgetResizable), can be used to implement " "zooming and scaling features.</p>" "<p>In addition the example shows how to use QPainter to " "print an image.</p>") def createActions(self): self.openAct = QAction("&Open...", self, shortcut="Ctrl+O", triggered=self.open) self.printAct = QAction("&Print...", self, shortcut="Ctrl+P", enabled=False, triggered=self.print_) self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q", triggered=self.close) self.zoomInAct = QAction("Zoom &In (25%)", self, shortcut="Ctrl++", enabled=False, triggered=self.zoomIn) self.zoomOutAct = QAction("Zoom &Out (25%)", self, shortcut="Ctrl+-", enabled=False, triggered=self.zoomOut) self.normalSizeAct = QAction("&Normal Size", self, shortcut="Ctrl+S", enabled=False, triggered=self.normalSize) self.fitToWindowAct = QAction("&Fit to Window", self, enabled=False, checkable=True, shortcut="Ctrl+F", triggered=self.fitToWindow) self.aboutAct = QAction("&About", self, triggered=self.about) self.aboutQtAct = QAction("About &Qt", self, triggered=qApp.aboutQt) def createMenus(self): self.fileMenu = QMenu("&File", self) self.fileMenu.addAction(self.openAct) self.fileMenu.addAction(self.printAct) self.fileMenu.addSeparator() self.fileMenu.addAction(self.exitAct) self.viewMenu = QMenu("&View", self) self.viewMenu.addAction(self.zoomInAct) self.viewMenu.addAction(self.zoomOutAct) self.viewMenu.addAction(self.normalSizeAct) self.viewMenu.addSeparator() self.viewMenu.addAction(self.fitToWindowAct) self.helpMenu = QMenu("&Help", self) self.helpMenu.addAction(self.aboutAct) self.helpMenu.addAction(self.aboutQtAct) self.menuBar().addMenu(self.fileMenu) self.menuBar().addMenu(self.viewMenu) self.menuBar().addMenu(self.helpMenu) def updateActions(self): self.zoomInAct.setEnabled(not self.fitToWindowAct.isChecked()) self.zoomOutAct.setEnabled(not self.fitToWindowAct.isChecked()) self.normalSizeAct.setEnabled(not self.fitToWindowAct.isChecked()) def scaleImage(self, factor): self.scaleFactor *= factor self.imageLabel.resize(self.scaleFactor * self.imageLabel.pixmap().size()) self.adjustScrollBar(self.scrollArea.horizontalScrollBar(), factor) self.adjustScrollBar(self.scrollArea.verticalScrollBar(), factor) self.zoomInAct.setEnabled(self.scaleFactor < 3.0) self.zoomOutAct.setEnabled(self.scaleFactor > 0.333) def adjustScrollBar(self, scrollBar, factor): scrollBar.setValue(int(factor * scrollBar.value() + ((factor - 1) * scrollBar.pageStep() / 2))) if __name__ == '__main__': import sys from PyQt5.QtWidgets import QApplication app = QApplication(sys.argv) imageViewer = QImageViewer() imageViewer.show() sys.exit(app.exec_())- image crop code using opencv
import cv2 mouse_is_pressing = False start_x, start_y = -1, -1 def mouse_callback(event, x, y, flags, param): global start_x, start_y, mouse_is_pressing img_result = src.copy() if event == cv2.EVENT_LBUTTONDOWN: mouse_is_pressing = True start_x, start_y = x,y cv2.circle(img_result, (x,y), 10, (0,255,0),-1) cv2.imshow("img_color", img_result) elif event == cv2.EVENT_MOUSEMOVE: if mouse_is_pressing: cv2.rectangle(img_result, (start_x, start_y), (x,y), (0,255,0), 3) cv2.imshow("img_color", img_result) elif event == cv2.EVENT_LBUTTONUP: mouse_is_pressing = False img_part = img_result[start_y:y, start_x:x] cv2.imshow("img_color", img_result) cv2.imshow("img_part", img_part) src = cv2.imread("D:/python data/image/image.jpg") cv2.imshow("img_color", src) cv2.setMouseCallback("img_color", mouse_callback) cv2.waitKey(0) cv2.destroyAllWindows()解決方案Implementing the crop in a viewer based on a QScrollArea with a QLabel is unnecessarily complicated since the transformation is complicated to track, instead implement the same logic with QGraphicsView, QGraphicsScene and QGraphicsPixmapItem. So much of the logic is already implemented as I show below:
from PyQt5 import QtCore, QtGui, QtWidgets, QtPrintSupport class Viewer(QtWidgets.QGraphicsView): def __init__(self, parent=None): super().__init__(QtWidgets.QGraphicsScene(), parent) self.pixmap_item = self.scene().addPixmap(QtGui.QPixmap()) self.setAlignment(QtCore.Qt.AlignTop | QtCore.Qt.AlignLeft) self.setBackgroundRole(QtGui.QPalette.Dark) self.setDragMode(QtWidgets.QGraphicsView.RubberBandDrag) self.rubberBandChanged.connect(self.onRubberBandChanged) self.last_rect = QtCore.QPointF() def setPixmap(self, pixmap): self.pixmap_item.setPixmap(pixmap) def zoomIn(self): self.scale(1.25, 1.25) def zoomOut(self): self.scale(0.8, 0.8) def resetZoom(self): self.resetTransform() def fitToWindow(self): self.fitInView(self.pixmap_item) @QtCore.pyqtSlot(QtCore.QRect, QtCore.QPointF, QtCore.QPointF) def onRubberBandChanged(self, rubberBandRect, fromScenePoint, toScenePoint): if rubberBandRect.isNull(): pixmap = self.pixmap_item.pixmap() rect = self.pixmap_item.mapFromScene(self.last_rect).boundingRect().toRect() if not rect.intersected(pixmap.rect()).isNull(): crop_pixmap = pixmap.copy(rect) label = QtWidgets.QLabel(pixmap=crop_pixmap) dialog = QtWidgets.QDialog(self) lay = QtWidgets.QVBoxLayout(dialog) lay.addWidget(label) dialog.exec_() self.last_rect = QtCore.QRectF() else: self.last_rect = QtCore.QRectF(fromScenePoint, toScenePoint) class QImageViewer(QtWidgets.QMainWindow): def __init__(self, parent=None): super().__init__() self.view = Viewer() self.setCentralWidget(self.view) self.printer = QtPrintSupport.QPrinter() self.createActions() self.createMenus() self.setWindowTitle("Image Viewer") self.resize(800, 600) def open(self): fileName, _ = QtWidgets.QFileDialog.getOpenFileName( self, "QFileDialog.getOpenFileName()", "", "Images (*.png *.jpeg *.jpg *.bmp *.gif)", ) if fileName: pixmap = QtGui.QPixmap(fileName) if pixmap.isNull(): QtWidgets.QMessageBox.information( self, "Image Viewer", "Cannot load %s." % fileName ) return self.view.setPixmap(pixmap) self.printAct.setEnabled(True) self.fitToWindowAct.setEnabled(True) self.updateActions() if not self.fitToWindowAct.isChecked(): pass # self.imageLabel.adjustSize() def print_(self): dialog = QtPrintSupport.QPrintDialog(self.printer, self) if dialog.exec_(): pixmap = self.view.pixmap_item.pixmap() painter = QtGui.QPainter(self.printer) rect = painter.viewport() size = pixmap.size() size.scale(rect.size(), QtCore.Qt.KeepAspectRatio) painter.setViewport(rect.x(), rect.y(), size.width(), size.height()) painter.setWindow(pixmap.rect()) painter.drawPixmap(0, 0, pixmap) def fitToWindow(self): if self.fitToWindowAct.isChecked(): self.view.fitToWindow() else: self.view.resetZoom() self.updateActions() def about(self): QtWidgets.QMessageBox.about( self, "About Image Viewer", "<p>The <b>Image Viewer</b> example shows how to combine " "QLabel and QScrollArea to display an image. QLabel is " "typically used for displaying text, but it can also display " "an image. QScrollArea provides a scrolling view around " "another widget. If the child widget exceeds the size of the " "frame, QScrollArea automatically provides scroll bars.</p>" "<p>The example demonstrates how QLabel's ability to scale " "its contents (QLabel.scaledContents), and QScrollArea's " "ability to automatically resize its contents " "(QScrollArea.widgetResizable), can be used to implement " "zooming and scaling features.</p>" "<p>In addition the example shows how to use QPainter to " "print an image.</p>", ) def createActions(self): self.openAct = QtWidgets.QAction( "&Open...", self, shortcut="Ctrl+O", triggered=self.open ) self.printAct = QtWidgets.QAction( "&Print...", self, shortcut="Ctrl+P", enabled=False, triggered=self.print_ ) self.exitAct = QtWidgets.QAction( "E&xit", self, shortcut="Ctrl+Q", triggered=self.close ) self.zoomInAct = QtWidgets.QAction( "Zoom &In (25%)", self, shortcut="Ctrl++", enabled=False, triggered=self.view.zoomIn, ) self.zoomOutAct = QtWidgets.QAction( "Zoom &Out (25%)", self, shortcut="Ctrl+-", enabled=False, triggered=self.view.zoomOut, ) self.normalSizeAct = QtWidgets.QAction( "&Normal Size", self, shortcut="Ctrl+S", enabled=False, triggered=self.view.resetZoom, ) self.fitToWindowAct = QtWidgets.QAction( "&Fit to Window", self, enabled=False, checkable=True, shortcut="Ctrl+F", triggered=self.fitToWindow, ) self.aboutAct = QtWidgets.QAction("&About", self, triggered=self.about) self.aboutQtAct = QtWidgets.QAction( "About &Qt", self, triggered=QtWidgets.qApp.aboutQt ) def createMenus(self): self.fileMenu = QtWidgets.QMenu("&File", self) self.fileMenu.addAction(self.openAct) self.fileMenu.addAction(self.printAct) self.fileMenu.addSeparator() self.fileMenu.addAction(self.exitAct) self.viewMenu = QtWidgets.QMenu("&View", self) self.viewMenu.addAction(self.zoomInAct) self.viewMenu.addAction(self.zoomOutAct) self.viewMenu.addAction(self.normalSizeAct) self.viewMenu.addSeparator() self.viewMenu.addAction(self.fitToWindowAct) self.helpMenu = QtWidgets.QMenu("&Help", self) self.helpMenu.addAction(self.aboutAct) self.helpMenu.addAction(self.aboutQtAct) self.menuBar().addMenu(self.fileMenu) self.menuBar().addMenu(self.viewMenu) self.menuBar().addMenu(self.helpMenu) def updateActions(self): self.zoomInAct.setEnabled(not self.fitToWindowAct.isChecked()) self.zoomOutAct.setEnabled(not self.fitToWindowAct.isChecked()) self.normalSizeAct.setEnabled(not self.fitToWindowAct.isChecked()) if __name__ == "__main__": import sys from PyQt5.QtWidgets import QApplication app = QApplication(sys.argv) imageViewer = QImageViewer() imageViewer.show() sys.exit(app.exec_())這篇關(guān)于如何結(jié)合這兩個(gè)代碼?(python圖像查看器+鼠標(biāo)拖動(dòng)圖像ROI裁剪)的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！
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