def set_attribute(self, name, value):
"""Set the value of the attribute of the given name to the given value"""
_value = value # Keep the original for the sake of the error message
if isinstance(_value, str):
_value = _value.encode('utf8')
try:
nv.IMAQdxSetAttribute(self.imaqdx, name.encode('utf8'), _value)
except Exception as e:
# Add some info to the exception:
msg = f"failed to set attribute {name} to {value}"
raise Exception(msg) from e
def updateSettings(self):
with self.mutex:
wasActive = self.active
# Stop acquistion, close and reopen camera
if wasActive:
self.stopCapture()
if self.id is not None:
self.closeCamera()
self.openCamera()
# Video Mode
modes, currentMode = nivision.IMAQdxEnumerateVideoModes(self.id)
foundMode = None
foundFps = 1000
for mode in modes:
m = self.reMode.match(mode.Name)
if not m:
continue
if int(m.group("width")) != self.width:
continue
if int(m.group("height")) != self.height:
continue
fps = float(m.group("fps"))
if fps < self.fps:
continue
if fps > foundFps:
continue
isJpeg = m.group("format") in (b"jpeg", b"JPEG")
if (self.useJpeg and not isJpeg) or (not self.useJpeg
and isJpeg):
continue
foundMode = mode
foundFps = fps
if foundMode is not None:
logger.info("found mode %d: %s" %
(foundMode.Value, foundMode.Name))
if foundMode.Value != currentMode.value:
nivision.IMAQdxSetAttribute(
self.id, nivision.IMAQdxAttributeVideoMode, foundMode)
# White Balance
if self.whiteBalance == "auto":
nivision.IMAQdxSetAttribute(self.id, self.ATTR_WB_MODE,
b"Auto")
else:
nivision.IMAQdxSetAttribute(self.id, self.ATTR_WB_MODE,
b"Manual")
if self.whiteBalanceValue is not None:
nivision.IMAQdxSetAttribute(self.id, self.ATTR_WB_VALUE,
self.whiteBalanceValue)
# Exposure
if self.exposure == "auto":
nivision.IMAQdxSetAttribute(self.id, self.ATTR_EX_MODE,
b"AutoAperaturePriority")
else:
nivision.IMAQdxSetAttribute(self.id, self.ATTR_EX_MODE,
b"Manual")
if self.exposureValue is not None:
minv = nivision.IMAQdxGetAttributeMinimum(
self.id, self.ATTR_EX_VALUE)
maxv = nivision.IMAQdxGetAttributeMaximum(
self.id, self.ATTR_EX_VALUE)
val = minv + ((maxv - minv) * (self.exposureValue / 100.0))
nivision.IMAQdxSetAttribute(self.id, self.ATTR_EX_VALUE,
val)
# Brightness
nivision.IMAQdxSetAttribute(self.id, self.ATTR_BR_MODE, b"Manual")
minv = nivision.IMAQdxGetAttributeMinimum(self.id,
self.ATTR_BR_VALUE)
maxv = nivision.IMAQdxGetAttributeMaximum(self.id,
self.ATTR_BR_VALUE)
val = minv + ((maxv - minv) * (self.brightness / 100.0))
nivision.IMAQdxSetAttribute(self.id, self.ATTR_BR_VALUE, val)
# Restart acquisition
if wasActive:
self.startCapture()
def set_attribute(self, attr, value):
# attr names need to be bytes but values can be strings
attr = _ensure_str(attr).encode('utf8')
assert isinstance(value, (bytes, str, float))
nv.IMAQdxSetAttribute(self.imaqdx, attr, value)
import ctypes import nivision import numpy as np import struct from library import cam_x, cam_y, cam_offset_x, cam_offset_y offsetX = cam_offset_x offsetY = cam_offset_y total_pixels = cam_x * cam_y fmt = '>' + str(total_pixels) + 'B' cam = ctypes.c_char_p(b"cam0") id = nivision.IMAQdxOpenCamera(cam, nivision.IMAQdxCameraControlModeController) img = nivision.imaqCreateImage(nivision.ImageType(0)) nivision.IMAQdxSetAttribute(id, nivision.IMAQdxAttributeOffsetX, offsetX) nivision.IMAQdxSetAttribute(id, nivision.IMAQdxAttributeOffsetY, offsetY) nivision.IMAQdxSetAttribute(id, nivision.IMAQdxAttributeWidth, cam_x) nivision.IMAQdxSetAttribute(id, nivision.IMAQdxAttributeHeight, cam_y) nivision.IMAQdxSetAttribute(id, b'CameraAttributes::Shutter::Mode', 0) nivision.IMAQdxSetAttribute(id, b'CameraAttributes::Shutter::Value', 10) nivision.IMAQdxSetAttribute(id, b'CameraAttributes::FrameRate::Mode', 0) nivision.IMAQdxSetAttribute(id, b'CameraAttributes::FrameRate::Value', 200) nivision.IMAQdxConfigureGrab(id) def capture(): nivision.IMAQdxGrab(id, img, 1) picture = nivision.imaqImageToArray(img) data = struct.unpack(fmt, picture[0]) data = np.asarray(data) data = np.reshape(data, (cam_y, cam_x))