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grabcut.py
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grabcut.py
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# coding=utf-8
import sys
from pathlib import Path
import webbrowser
import numpy as np
import cv2
from PIL import Image
from PyQt5.QtCore import QDir, Qt, pyqtSlot, pyqtSignal
from PyQt5.QtGui import QImage, QPixmap, QColor
from PyQt5.QtWidgets import (
QApplication, QMainWindow, QWidget,
QMessageBox, QFileDialog, QLabel, QSpinBox, QPushButton,
QActionGroup, QAction, QSizePolicy, QHBoxLayout,
)
from ui_grabcut import Ui_MainWindow
class Canvas(QLabel):
"""Canvas for drawing mask layer on Image.
"""
mousePressed = pyqtSignal()
mouseMoved = pyqtSignal(int, int, int, int)
def __init__(self, parent):
super().__init__(parent)
self.parent = parent
# self.setStyleSheet("border: 1px solid red;")
self.last_x, self.last_y = None, None
def mousePressEvent(self, e):
self.mousePressed.emit()
def mouseMoveEvent(self, e):
x, y = e.x(), e.y()
if self.last_x is None:
self.last_x, self.last_y = x, y
return
self.mouseMoved.emit(self.last_x, self.last_y, x, y)
self.last_x, self.last_y = x, y
def mouseReleaseEvent(self, e):
self.last_x, self.last_y = None, None
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow, self).__init__(*args, **kwargs)
# orign image data
self.img = None
# mask layer for grabcut
self.mask = None
# history masks for undo
self.masks = []
# grabcut algorithm param iterCount
self.iterCount = 5
# canvas image cache
self.imgWithMask = None
# mask mode to color, don't use dict, too slow!
self.mode2color = (
# cv2.GC_BGD == 0
np.array([0, 0, 255], dtype=np.uint8),
# cv2.GC_FGD == 1
np.array([0, 255, 0], dtype=np.uint8),
# cv2.GC_PR_BGD == 2
np.array([0, 0, 120], dtype=np.uint8),
# cv2.GC_PR_FGD == 3
np.array([0, 120, 0], dtype=np.uint8),
)
# NONE mean none of (BGD/FGD/PR_BGD/PR_FGD)
self.GC_NONE = 255
# mask layer alpha
self.alpha = 0.3
self.imgPath = Path.cwd()
self.penSize = 40
# init ui order matter
self.initUI()
def grabCut(self, iterCount):
if self.img is None:
self.showMessage("No image")
return
# avoid grabCut crash
if not np.any((self.mask == cv2.GC_FGD) | (self.mask == cv2.GC_PR_FGD)):
self.showMessage("no GC_FGD or GC_PR_FGD")
return
# before grabcut, save mask to stack
self.pushMask()
bgdModel = np.zeros((1, 65), np.float64)
fgdModel = np.zeros((1, 65), np.float64)
_ = cv2.grabCut(self.img, self.mask, None, bgdModel,
fgdModel, iterCount, cv2.GC_INIT_WITH_MASK)
self.drawPartialImgWithMask(self.masks[-1], self.mask)
# display result
self.ui.displayResultAction.setChecked(True)
self.repaint()
def drawingMask(self, x1, y1, x2, y2):
"""drawing an small partial of the mask layer,
which is a small line segment.
"""
if self.img is None:
return
# when hidden mask or display result, don't draw mask
if self.ui.hiddenMaskAction.isChecked() or \
self.ui.displayResultAction.isChecked():
return
if self.ui.prFgdAction.isChecked():
mode = cv2.GC_PR_FGD
elif self.ui.prBgdAction.isChecked():
mode = cv2.GC_PR_BGD
elif self.ui.fgdAction.isChecked():
mode = cv2.GC_FGD
else: # bgdAction
mode = cv2.GC_BGD
cv2.line(self.mask, (x1, y1), (x2, y2), mode, self.penSize)
partialMask = np.zeros(self.mask.shape, np.uint8)
# GC_BGD is 0, can't use 0 as default
partialMask.fill(self.GC_NONE)
cv2.line(partialMask, (x1, y1), (x2, y2), mode, self.penSize)
indices = np.where(partialMask != self.GC_NONE)
if indices[0].size == 0:
# nothing new in partialMask
return
self.imgWithMask[indices] = (1 - self.alpha)*self.img[indices] + \
self.alpha*self.mode2color[mode]
self.repaint()
def pushMask(self):
"""push a mask to history list masks for undo.
"""
# if mask hasn't changed
if len(self.masks) > 0 and np.array_equal(self.masks[-1], self.mask):
return
self.masks.append(self.mask.copy())
def drawPartialImgWithMask(self, curMask, newMask):
"""draw partial imgWithMask.
mask changed from curMask to newMask, only draw the changed part.
"""
# redraw partial imgWithMask
indices = np.where(curMask != newMask)
if indices[0].size == 0:
# two masks are equal
return
self.imgWithMask[indices] = (1-self.alpha)*self.img[indices] + \
self.alpha*np.array([self.mode2color[m] for m in newMask[indices]])
def getResult(self):
"""use mask cuf off forground area as final result.
"""
result_mask = np.where((self.mask == 2) | (
self.mask == 0), 0, 1).astype('uint8')
return self.img*result_mask[:, :, np.newaxis]
@pyqtSlot(name="on_displayResultAction_triggered")
@pyqtSlot(name="on_hiddenMaskAction_triggered")
def repaint(self):
"""repaint cavans.
"""
if self.img is None:
self.showMessage("No image")
return
if self.ui.displayResultAction.isChecked():
img = self.getResult()
elif self.ui.hiddenMaskAction.isChecked():
img = self.img
else:
img = self.imgWithMask
# convert opencv image to qt image
height, width, _ = img.shape
bytesOfLine = 3*width
image = QImage(img.tobytes(), width, height,
bytesOfLine, QImage.Format_RGB888).rgbSwapped()
self.canvas.setPixmap(QPixmap.fromImage(image))
def initUI(self):
# merge designer ui
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
# right box on toolbar
rightBox = QWidget(self.ui.toolBar)
boxLayout = QHBoxLayout()
# grabcut iterCount spinbox
boxLayout.addWidget(QLabel("iterCount"))
self.iterCountSpinBox = QSpinBox(self)
self.iterCountSpinBox.setRange(1, 100)
self.iterCountSpinBox.setValue(5)
boxLayout.addWidget(self.iterCountSpinBox)
boxLayout.addStretch(1)
# pen size spinbox
boxLayout.addWidget(QLabel("pen"))
self.penSizeSpinBox = QSpinBox(self)
self.penSizeSpinBox.setRange(1, 500)
self.penSizeSpinBox.setSingleStep(5)
self.penSizeSpinBox.setValue(40)
boxLayout.addWidget(self.penSizeSpinBox)
rightBox.setLayout(boxLayout)
self.ui.toolBar.addWidget(rightBox)
self.canvas = Canvas(self)
self.ui.scrollArea.setWidget(self.canvas)
# canvas align center in scroll area
self.ui.scrollArea.setAlignment(Qt.AlignCenter)
# fixed canvas that make it easier to select mask layer
self.canvas.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
# 4 types of mask layer flags
actionGroup = QActionGroup(self)
actionGroup.addAction(self.ui.fgdAction)
actionGroup.addAction(self.ui.bgdAction)
actionGroup.addAction(self.ui.prFgdAction)
actionGroup.addAction(self.ui.prBgdAction)
# handle events
self.ui.exitAction.triggered.connect(self.close)
self.penSizeSpinBox.valueChanged.connect(self.setPenSize)
self.iterCountSpinBox.valueChanged.connect(self.setIterCount)
self.ui.opencvAction.triggered.connect(lambda: webbrowser.open(
'https://opencv-python-tutroals.readthedocs.io/en/'
'latest/py_tutorials/py_imgproc/py_grabcut/py_grabcut.html'
))
self.canvas.mousePressed.connect(self.pushMask)
self.canvas.mouseMoved.connect(self.drawingMask)
self.resetUiToDrawMaskMode()
def resetUiToDrawMaskMode(self):
"""reset ui to draw mask mode.
"""
self.ui.prFgdAction.setChecked(True)
self.ui.displayResultAction.setChecked(False)
self.ui.hiddenMaskAction.setChecked(False)
def setPenSize(self, v):
self.penSize = v
def setIterCount(self, v):
self.iterCount = v
def showMessage(self, msg):
self.ui.statusbar.showMessage(msg)
@pyqtSlot(name="on_openAction_triggered")
def openImage(self):
fileName, _ = QFileDialog.getOpenFileName(
self, "Open File", str(self.imgPath))
if not fileName:
return
imgFile = Path(fileName)
self.imgPath = imgFile.parent
# cv2.imread can't read image that path contain chinese characters,
# so this is a workaround.
# self.img = cv2.imread(fileName)
data = np.fromfile(fileName, dtype=np.uint8)
self.img = cv2.imdecode(data, cv2.IMREAD_UNCHANGED)
# discarding alpha channel
self.img = self.img[:,:,:3]
self.reset()
@pyqtSlot(name="on_saveAction_triggered")
def saveResult(self):
if self.img is None:
self.showMessage("no result to save")
return
fileName, _ = QFileDialog.getSaveFileName(
self, "Save File", str(self.imgPath))
if not fileName:
return
imgFile = Path(fileName)
self.imgPath = imgFile.parent
# default save as png
if not imgFile.suffix:
imgFile = imgFile.with_suffix('.png')
result = self.getResult()
# cv2.imwrite can't write image that path contain chinese characters.
im = Image.fromarray(result)
im.save(imgFile.as_posix())
@pyqtSlot(name="on_exportMaskAction_triggered")
def exportMask(self):
if self.mask is None or not self.mask.any():
self.showMessage("no mask")
return
fileName, _ = QFileDialog.getSaveFileName(
self, "Save Mask", str(self.imgPath))
if not fileName:
return
imgFile = Path(fileName)
self.imgPath = imgFile.parent
# default save as png
if not imgFile.suffix:
imgFile = imgFile.with_suffix('.png')
im = Image.fromarray(self.mask)
im.save(imgFile.as_posix())
@pyqtSlot(name="on_undoAction_triggered")
def undo(self):
if len(self.masks) == 0:
self.showMessage("undo stack is empty")
return
prevMask = self.masks.pop()
self.drawPartialImgWithMask(self.mask, prevMask)
self.mask = prevMask
# after undo, uncheck display result and hidden mask
self.resetUiToDrawMaskMode()
self.repaint()
@pyqtSlot(name="on_resetAction_triggered")
def reset(self):
if self.img is None:
self.showMessage("No image")
return
self.mask = np.zeros(self.img.shape[:2], np.uint8)
self.mask.fill(cv2.GC_PR_BGD)
self.masks = []
# re-create imgWidthMask
self.imgWithMask = np.zeros(self.img.shape, np.uint8)
self.imgWithMask[...] = (1-self.alpha)*self.img + \
self.alpha*self.mode2color[cv2.GC_PR_BGD]
self.resetUiToDrawMaskMode()
self.repaint()
@pyqtSlot(name="on_grabCutAction_triggered")
def runGrabCut(self):
self.grabCut(self.iterCount)
@pyqtSlot(name="on_singleStepAction_triggered")
def runGrabCutSingleStep(self):
self.grabCut(1)
def closeEvent(self, evt):
# maybe popup a dialog to ask user accept or ignore
evt.accept()
if __name__ == '__main__':
app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()