pyqtgraph/examples/VideoSpeedTest.py

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# -*- coding: utf-8 -*-
"""
Tests the speed of image updates for an ImageItem and RawImageWidget.
The speed will generally depend on the type of data being shown, whether
it is being scaled and/or converted by lookup table, and whether OpenGL
is used by the view widget
"""
import initExample ## Add path to library (just for examples; you do not need this)
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from pyqtgraph.Qt import QtGui, QtCore, USE_PYSIDE, USE_PYSIDE2, USE_PYQT5
import numpy as np
import pyqtgraph as pg
import pyqtgraph.ptime as ptime
if USE_PYSIDE:
import VideoTemplate_pyside as VideoTemplate
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elif USE_PYSIDE2:
import VideoTemplate_pyside2 as VideoTemplate
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elif USE_PYQT5:
import VideoTemplate_pyqt5 as VideoTemplate
else:
import VideoTemplate_pyqt as VideoTemplate
#QtGui.QApplication.setGraphicsSystem('raster')
app = QtGui.QApplication([])
#mw = QtGui.QMainWindow()
#mw.resize(800,800)
win = QtGui.QMainWindow()
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win.setWindowTitle('pyqtgraph example: VideoSpeedTest')
ui = VideoTemplate.Ui_MainWindow()
ui.setupUi(win)
win.show()
ui.maxSpin1.setOpts(value=255, step=1)
ui.minSpin1.setOpts(value=0, step=1)
#ui.graphicsView.useOpenGL() ## buggy, but you can try it if you need extra speed.
vb = pg.ViewBox()
ui.graphicsView.setCentralItem(vb)
vb.setAspectLocked()
img = pg.ImageItem()
vb.addItem(img)
vb.setRange(QtCore.QRectF(0, 0, 512, 512))
LUT = None
def updateLUT():
global LUT, ui
dtype = ui.dtypeCombo.currentText()
if dtype == 'uint8':
n = 256
else:
n = 4096
LUT = ui.gradient.getLookupTable(n, alpha=ui.alphaCheck.isChecked())
ui.gradient.sigGradientChanged.connect(updateLUT)
updateLUT()
ui.alphaCheck.toggled.connect(updateLUT)
def updateScale():
global ui
spins = [ui.minSpin1, ui.maxSpin1, ui.minSpin2, ui.maxSpin2, ui.minSpin3, ui.maxSpin3]
if ui.rgbLevelsCheck.isChecked():
for s in spins[2:]:
s.setEnabled(True)
else:
for s in spins[2:]:
s.setEnabled(False)
ui.rgbLevelsCheck.toggled.connect(updateScale)
cache = {}
def mkData():
with pg.BusyCursor():
global data, cache, ui
frames = ui.framesSpin.value()
width = ui.widthSpin.value()
height = ui.heightSpin.value()
dtype = (ui.dtypeCombo.currentText(), ui.rgbCheck.isChecked(), frames, width, height)
if dtype not in cache:
if dtype[0] == 'uint8':
dt = np.uint8
loc = 128
scale = 64
mx = 255
elif dtype[0] == 'uint16':
dt = np.uint16
loc = 4096
scale = 1024
mx = 2**16
elif dtype[0] == 'float':
dt = np.float
loc = 1.0
scale = 0.1
if ui.rgbCheck.isChecked():
data = np.random.normal(size=(frames,width,height,3), loc=loc, scale=scale)
data = pg.gaussianFilter(data, (0, 6, 6, 0))
else:
data = np.random.normal(size=(frames,width,height), loc=loc, scale=scale)
data = pg.gaussianFilter(data, (0, 6, 6))
if dtype[0] != 'float':
data = np.clip(data, 0, mx)
data = data.astype(dt)
data[:, 10, 10:50] = mx
data[:, 9:12, 48] = mx
data[:, 8:13, 47] = mx
cache = {dtype: data} # clear to save memory (but keep one to prevent unnecessary regeneration)
data = cache[dtype]
updateLUT()
updateSize()
def updateSize():
global ui
frames = ui.framesSpin.value()
width = ui.widthSpin.value()
height = ui.heightSpin.value()
dtype = np.dtype(str(ui.dtypeCombo.currentText()))
rgb = 3 if ui.rgbCheck.isChecked() else 1
ui.sizeLabel.setText('%d MB' % (frames * width * height * rgb * dtype.itemsize / 1e6))
mkData()
ui.dtypeCombo.currentIndexChanged.connect(mkData)
ui.rgbCheck.toggled.connect(mkData)
ui.widthSpin.editingFinished.connect(mkData)
ui.heightSpin.editingFinished.connect(mkData)
ui.framesSpin.editingFinished.connect(mkData)
ui.widthSpin.valueChanged.connect(updateSize)
ui.heightSpin.valueChanged.connect(updateSize)
ui.framesSpin.valueChanged.connect(updateSize)
ptr = 0
lastTime = ptime.time()
fps = None
def update():
global ui, ptr, lastTime, fps, LUT, img
if ui.lutCheck.isChecked():
useLut = LUT
else:
useLut = None
downsample = ui.downsampleCheck.isChecked()
if ui.scaleCheck.isChecked():
if ui.rgbLevelsCheck.isChecked():
useScale = [
[ui.minSpin1.value(), ui.maxSpin1.value()],
[ui.minSpin2.value(), ui.maxSpin2.value()],
[ui.minSpin3.value(), ui.maxSpin3.value()]]
else:
useScale = [ui.minSpin1.value(), ui.maxSpin1.value()]
else:
useScale = None
if ui.rawRadio.isChecked():
ui.rawImg.setImage(data[ptr%data.shape[0]], lut=useLut, levels=useScale)
ui.stack.setCurrentIndex(1)
elif ui.rawGLRadio.isChecked():
ui.rawGLImg.setImage(data[ptr%data.shape[0]], lut=useLut, levels=useScale)
ui.stack.setCurrentIndex(2)
else:
img.setImage(data[ptr%data.shape[0]], autoLevels=False, levels=useScale, lut=useLut, autoDownsample=downsample)
ui.stack.setCurrentIndex(0)
#img.setImage(data[ptr%data.shape[0]], autoRange=False)
ptr += 1
now = ptime.time()
dt = now - lastTime
lastTime = now
if fps is None:
fps = 1.0/dt
else:
s = np.clip(dt*3., 0, 1)
fps = fps * (1-s) + (1.0/dt) * s
ui.fpsLabel.setText('%0.2f fps' % fps)
app.processEvents() ## force complete redraw for every plot
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()