def process(self, imageIn, timeNow):
#self.image = imageIn
self.headingError = 0.0
# [Sim] Turn imageIn by current angle = self.heading
if self.sim and self.heading != 0.0:
#self.logd("process", "Heading = %.2f" % self.heading)
imageIn = rotateImage(imageIn, self.heading)
# Grab detected line, if any
if self.detector is None:
return # skip if we don't have a detector and were still called to process
self.state = LineWalker.State.SEARCHING
if self.detector.state is LineDetector.State.FOUND: # skip if line not found
# TODO skip if confidence is low
whiteLine = self.detector.primaryLine
if self.gui:
cv2.circle(self.detector.imageOut, whiteLine.ptLeft, 10, (255, 0, 0), 2)
cv2.circle(self.detector.imageOut, whiteLine.ptRight, 10, (255, 0, 0), 2)
if whiteLine.valid and abs(whiteLine.angle) >= self.epsilonLineAngle and abs(whiteLine.angle) <= self.maxLineAngle:
# Compute heading error between self and line; TODO use actual bot heading, and reject very high changes (position, angle) as invalid
self.headingError = -whiteLine.angle
self.state = LineWalker.State.GOOD
else:
self.state = LineWalker.State.BAD
# [Sim] Artificially change self heading
if self.sim and self.headingError != 0.0:
if whiteLine.ptLeft[1] < whiteLine.ptRight[1]:
self.heading += 1.0
else:
self.heading -= 1.0
# TODO Based on self.detector.state, iterate through move-check loop
return True, self.detector.imageOut
def start(self):
"""Create FrameProcessor objects and start vision loop (works on a static image, video or camera input)."""
# * Initialize other parameters and flags
delay = 10 # ms
delayS = delay / 1000.0 # sec; only used in non-GUI mode, so this can be set to 0
showInput = self.gui and True
showOutput = self.gui and True
showFPS = False
showKeys = False
isImage = False
isVideo = False
isReady = False
isFrozen = False
# * Read input image or video, if specified
if self.filename is not None and not self.filename == "camera":
if isImageFile(self.filename):
self.logi("start", 'Reading image: "' + self.filename + '"')
frame = cv2.imread(self.filename)
if frame is not None:
if showInput:
cv2.imshow("Input", frame)
frozenFrame = frame.copy() # useful if simulating and rotating image every frame
isImage = True
isReady = True
else:
self.loge("start", "Error reading image; fallback to camera.")
else:
self.logi("start", 'Reading video: "' + self.filename + '"')
camera = cv2.VideoCapture(self.filename)
if camera.isOpened():
isVideo = True
isReady = True
else:
self.loge("start", "Error reading video; fallback to camera.")
# * Open camera if input image/video is not provided/available
if not isReady:
self.logi("start", "Opening camera...")
camera = cv2.VideoCapture(0)
# ** Final check before vision loop
if camera.isOpened():
result_width = camera.set(cv.CV_CAP_PROP_FRAME_WIDTH, camera_frame_width)
result_height = camera.set(cv.CV_CAP_PROP_FRAME_HEIGHT, camera_frame_height)
self.logd(
"start",
"Camera frame size set to {width}x{height} (result: {result_width}, {result_height})".format(
width=camera_frame_width,
height=camera_frame_height,
result_width=result_width,
result_height=result_height,
),
)
isReady = True
else:
self.loge("start", "Error opening camera; giving up now.")
return
# * Create pipeline(s) of FrameProcessor objects, initialize supporting variables
# pipeline = FrameProcessorPipeline(self.options, [ColorFilterProcessor, LineDetector, LineWalker]) # line walking pipeline
# pipeline = FrameProcessorPipeline(self.options, [CMYKBlobDetector]) # CMYK blob detection
# pipeline = FrameProcessorPipeline(self.options, [ColorFilterProcessor, BlobTracker]) # blob tracking pipeline
# pipeline = FrameProcessorPipeline(self.options, [ColorFilterProcessor, LineDetector, LineWalker, BlobTracker]) # combined pipeline
# pipeline = FrameProcessorPipeline(self.options, [ColorPaletteDetector, LineDetector, LineWalker, CMYKBlobDetector]) # CMYK blob detection + line walking pipeline
pipeline = FrameProcessorPipeline(
self.options, [ColorFilterProcessor, LineDetector, LineWalker, BlobTracker, CMYKBlobDetector]
) # combined pipeline: line walking + blob tracking + CMYK blob detection
# ** Get references to specific processors for fast access
# colorFilter = pipeline.getProcessorByType(ColorFilterProcessor)
colorPaletteDetector = pipeline.getProcessorByType(ColorPaletteDetector)
lineDetector = pipeline.getProcessorByType(LineDetector)
lineWalker = pipeline.getProcessorByType(LineWalker)
blobDetector = pipeline.getProcessorByType(CMYKBlobDetector)
blobTracker = pipeline.getProcessorByType(BlobTracker)
# * Set signal handler before starting vision loop (NOTE must be done in the main thread of this process)
signal.signal(signal.SIGTERM, self.handleSignal)
signal.signal(signal.SIGINT, self.handleSignal)
# * Vision loop
self.logi("start", "Starting vision loop...")
self.isOkay = True
fresh = True
frameCount = 0
timeLast = timeNow = 0.0
timeStart = cv2.getTickCount() / cv2.getTickFrequency()
while self.isOkay and not self.bot_state.get("die", False):
# ** [timing] Obtain relative timestamp for this loop iteration
timeNow = (cv2.getTickCount() / cv2.getTickFrequency()) - timeStart
# ** Print any pre-frame messages
if not self.gui:
self.logd(
"start", "[LOOP] Frame: {0:05d}, time: {1:07.3f}".format(frameCount, timeNow)
) # if no GUI, print something to show we are running
if showFPS:
timeDiff = timeNow - timeLast
fps = (1.0 / timeDiff) if (timeDiff > 0.0) else 0.0
self.logi("start", "[LOOP] {0:5.2f} fps".format(fps))
# self.logd("start", "Pipeline: " + str(pipeline)) # current state of pipeline (preceding ~ means processor is inactive)
# ** If not static image, read frame from video/camera
if not isImage and not isFrozen:
isValid, frame = camera.read()
if not isValid:
break # camera disconnected or reached end of video
frameCount = frameCount + 1
if showInput:
cv2.imshow("Input", frame)
# [Sim] Rotate image to simulate bot movement
if self.sim and lineWalker is not None:
if self.heading != 0.0:
if isImage or isFrozen:
frame = frozenFrame.copy()
frame = rotateImage(frame, self.heading)
# ** Initialize FrameProcessors, if required
if fresh:
pipeline.initialize(frame, timeNow)
fresh = False
# ** Check bot_state activate only those processors that should be active
cv_offsetDetect = self.bot_state.get("cv_offsetDetect", True) # default True
# self.logd("start", "[LOOP] cv_offsetDetect? {0}".format(cv_offsetDetect)) # [debug]
if colorPaletteDetector is not None:
colorPaletteDetector.active = cv_offsetDetect
cv_lineTrack = self.bot_state.get("cv_lineTrack", False)
# self.logd("start", "[LOOP] cv_lineTrack? {0}".format(cv_lineTrack)) # [debug]
# pipeline.activateProcessors([LineDetector, LineWalker], cv_lineTrack)
if lineDetector is not None:
lineDetector.active = cv_lineTrack
if lineWalker is not None:
lineWalker.active = cv_lineTrack
cv_blobTrack = self.bot_state.get("cv_blobTrack", False)
# self.logd("start", "[LOOP] cv_blobTrack? {0}".format(cv_blobTrack)) # [debug]
# pipeline.activateProcessors([BlobTracker], cv_blobTrack)
if blobTracker is not None:
blobTracker.active = cv_blobTrack
cv_blockDetect = self.bot_state.get("cv_blockDetect", False)
# self.logd("start", "[LOOP] cv_blockDetect? {0}".format(cv_blockDetect)) # [debug]
# pipeline.activateProcessors([CMYKBlobDetector], cv_blockDetect)
if blobDetector is not None:
blobDetector.active = cv_blockDetect
# ** Process frame
keepRunning, imageOut = pipeline.process(frame, timeNow)
if not keepRunning:
self.stop()
# ** Perform post-process functions
if colorPaletteDetector is not None and colorPaletteDetector.active:
if colorPaletteDetector.cameraOffset is not None:
if (
self.bot_state["camera_offset"][0] != colorPaletteDetector.cameraOffset[0]
or self.bot_state["camera_offset"][1] != colorPaletteDetector.cameraOffset[1]
):
self.bot_state["camera_offset"] = colorPaletteDetector.cameraOffset
self.logd(
"start", "[LOOP] camera_offset (changed): {0}".format(self.bot_state["camera_offset"])
)
else:
self.loge("start", "[LOOP] camera_offset not available!")
if blobTracker is not None and blobTracker.active:
del self.blobs[:]
self.blobs.extend(blobTracker.blobs)
self.logd("start", "[LOOP] Got {0} blob(s) from blob tracker".format(len(self.blobs)))
elif blobDetector is not None and blobDetector.active:
del self.blobs[:]
self.blobs.extend(blobDetector.blobs)
self.logd("start", "[LOOP] Got {0} blob(s) from blob detector".format(len(self.blobs)))
if (
self.blobs and do_blockDetect_once
): # if some blobs have been found and we're supposed to do this only once
self.bot_state["cv_blockDetect"] = False
self.logd("start", "[LOOP] Set cv_blockDetect to {0}".format(self.bot_state["cv_blockDetect"]))
# TODO Send out actual movement commands to navigator (only in LINE_WALKING state)
if cv_lineTrack and lineWalker is not None:
if lineWalker.state is LineWalker.State.GOOD and lineWalker.headingError != 0.0:
self.logd("start", "[LOOP] heading_error: {0:.2f}".format(lineWalker.headingError))
# [Sim] Simulate bot movement from heading error reported by LineWalker
if self.sim:
self.heading -= 0.1 * lineWalker.headingError
# ** Show output image
if (
showOutput and not self.debug and imageOut is not None
): # no need to display when debug is True because pipeline then shows individual outputs
cv2.imshow("Output", imageOut) # output image from last processor
# ** Check if GUI is available
if self.gui:
# *** If so, wait for inter-frame delay and process keyboard events using OpenCV
key = cv2.waitKey(delay)
if key != -1:
keyCode = key & 0x00007F
keyChar = chr(keyCode) if not (key & KeyCode.SPECIAL) else None
if showKeys:
self.logi("start", "Key: " + KeyCode.describeKey(key))
if keyCode == 0x1B or keyChar == "q":
break
elif keyChar == " ":
self.logi("start", "[PAUSED] Press any key to continue...")
ticksPaused = cv2.getTickCount() # [timing] save time when paused
cv2.waitKey() # wait indefinitely for a key press
timeStart += (
cv2.getTickCount() - ticksPaused
) / cv2.getTickFrequency() # [timing] compensate for duration paused
elif keyCode == 0x0D:
if not isImage:
isFrozen = not isFrozen # freeze frame, but keep processors running
if isFrozen:
frozenFrame = frame
self.logi(
"start",
"Frame {0:05d} is now frozen".format(frameCount)
if isFrozen
else "Frame processing unfrozen",
)
elif keyChar == "x":
pipeline.deactivateProcessors()
self.logi("start", "Pipeline processors deactivated.")
elif keyChar == "y":
pipeline.activateProcessors()
self.logi("start", "Pipeline processors activated.")
elif keyChar == "f":
showFPS = not showFPS
elif keyChar == "k":
showKeys = not showKeys
else:
keepRunning = pipeline.onKeyPress(
key, keyChar
) # pass along key-press to processors in pipeline
if not keepRunning:
self.stop()
# ** [timing] Save timestamp for fps calculation
timeLast = timeNow
# * Reset signal handlers to default behavior
signal.signal(signal.SIGTERM, signal.SIG_DFL)
signal.signal(signal.SIGINT, signal.SIG_DFL)
# * Clean-up
self.logi("start", "Cleaning up...")
if self.gui:
cv2.destroyAllWindows()
if not isImage:
camera.release()
