/usr/lib/python2.7/dist-packages/pyqtgraph/examples/VideoSpeedTest.py is in python-pyqtgraph 0.9.10-5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | # -*- 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)
from pyqtgraph.Qt import QtGui, QtCore, USE_PYSIDE
import numpy as np
import pyqtgraph as pg
import pyqtgraph.ptime as ptime
if USE_PYSIDE:
import VideoTemplate_pyside 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()
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)
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_()
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