DepthAI Tutorials
DepthAI API References

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  • Spatial location calculator
  • Similar samples:
  • Demo
  • Setup
  • Source code

Spatial location calculator

This example shows how to retrieve spatial location data (X,Y,Z) on a runtime configurable ROI. You can move the ROI using WASD keys. X,Y,Z coordinates are relative to the center of depth map.You can also calculate spatial coordiantes on host side, demo here.

Similar samples:

Demo

Setup

Please run the install script to download all required dependencies. Please note that this script must be ran from git context, so you have to download the depthai-python repository first and then run the script
Command Line
1git clone https://github.com/luxonis/depthai-python.git
2cd depthai-python/examples
3python3 install_requirements.py
For additional information, please follow the installation guide.

Source code

Python
C++
Python
GitHub
1#!/usr/bin/env python3
2
3import cv2
4import depthai as dai
5import numpy as np
6stepSize = 0.05
7
8newConfig = False
9
10# Create pipeline
11pipeline = dai.Pipeline()
12
13# Define sources and outputs
14monoLeft = pipeline.create(dai.node.MonoCamera)
15monoRight = pipeline.create(dai.node.MonoCamera)
16stereo = pipeline.create(dai.node.StereoDepth)
17spatialLocationCalculator = pipeline.create(dai.node.SpatialLocationCalculator)
18
19xoutDepth = pipeline.create(dai.node.XLinkOut)
20xoutSpatialData = pipeline.create(dai.node.XLinkOut)
21xinSpatialCalcConfig = pipeline.create(dai.node.XLinkIn)
22
23xoutDepth.setStreamName("depth")
24xoutSpatialData.setStreamName("spatialData")
25xinSpatialCalcConfig.setStreamName("spatialCalcConfig")
26
27# Properties
28monoLeft.setResolution(dai.MonoCameraProperties.SensorResolution.THE_400_P)
29monoLeft.setCamera("left")
30monoRight.setResolution(dai.MonoCameraProperties.SensorResolution.THE_400_P)
31monoRight.setCamera("right")
32
33stereo.setDefaultProfilePreset(dai.node.StereoDepth.PresetMode.HIGH_DENSITY)
34stereo.setLeftRightCheck(True)
35stereo.setSubpixel(True)
36
37# Config
38topLeft = dai.Point2f(0.4, 0.4)
39bottomRight = dai.Point2f(0.6, 0.6)
40
41config = dai.SpatialLocationCalculatorConfigData()
42config.depthThresholds.lowerThreshold = 100
43config.depthThresholds.upperThreshold = 10000
44calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MEDIAN
45config.roi = dai.Rect(topLeft, bottomRight)
46
47spatialLocationCalculator.inputConfig.setWaitForMessage(False)
48spatialLocationCalculator.initialConfig.addROI(config)
49
50# Linking
51monoLeft.out.link(stereo.left)
52monoRight.out.link(stereo.right)
53
54spatialLocationCalculator.passthroughDepth.link(xoutDepth.input)
55stereo.depth.link(spatialLocationCalculator.inputDepth)
56
57spatialLocationCalculator.out.link(xoutSpatialData.input)
58xinSpatialCalcConfig.out.link(spatialLocationCalculator.inputConfig)
59
60# Connect to device and start pipeline
61with dai.Device(pipeline) as device:
62
63    # Output queue will be used to get the depth frames from the outputs defined above
64    depthQueue = device.getOutputQueue(name="depth", maxSize=4, blocking=False)
65    spatialCalcQueue = device.getOutputQueue(name="spatialData", maxSize=4, blocking=False)
66    spatialCalcConfigInQueue = device.getInputQueue("spatialCalcConfig")
67
68    color = (255, 255, 255)
69
70    print("Use WASD keys to move ROI!")
71
72    while True:
73        inDepth = depthQueue.get() # Blocking call, will wait until a new data has arrived
74
75        depthFrame = inDepth.getFrame() # depthFrame values are in millimeters
76
77        depth_downscaled = depthFrame[::4]
78        if np.all(depth_downscaled == 0):
79            min_depth = 0  # Set a default minimum depth value when all elements are zero
80        else:
81            min_depth = np.percentile(depth_downscaled[depth_downscaled != 0], 1)
82        max_depth = np.percentile(depth_downscaled, 99)
83        depthFrameColor = np.interp(depthFrame, (min_depth, max_depth), (0, 255)).astype(np.uint8)
84        depthFrameColor = cv2.applyColorMap(depthFrameColor, cv2.COLORMAP_HOT)
85
86        spatialData = spatialCalcQueue.get().getSpatialLocations()
87        for depthData in spatialData:
88            roi = depthData.config.roi
89            roi = roi.denormalize(width=depthFrameColor.shape[1], height=depthFrameColor.shape[0])
90            xmin = int(roi.topLeft().x)
91            ymin = int(roi.topLeft().y)
92            xmax = int(roi.bottomRight().x)
93            ymax = int(roi.bottomRight().y)
94
95            depthMin = depthData.depthMin
96            depthMax = depthData.depthMax
97
98            fontType = cv2.FONT_HERSHEY_TRIPLEX
99            cv2.rectangle(depthFrameColor, (xmin, ymin), (xmax, ymax), color, 1)
100            cv2.putText(depthFrameColor, f"X: {int(depthData.spatialCoordinates.x)} mm", (xmin + 10, ymin + 20), fontType, 0.5, color)
101            cv2.putText(depthFrameColor, f"Y: {int(depthData.spatialCoordinates.y)} mm", (xmin + 10, ymin + 35), fontType, 0.5, color)
102            cv2.putText(depthFrameColor, f"Z: {int(depthData.spatialCoordinates.z)} mm", (xmin + 10, ymin + 50), fontType, 0.5, color)
103        # Show the frame
104        cv2.imshow("depth", depthFrameColor)
105
106        key = cv2.waitKey(1)
107        if key == ord('q'):
108            break
109        elif key == ord('w'):
110            if topLeft.y - stepSize >= 0:
111                topLeft.y -= stepSize
112                bottomRight.y -= stepSize
113                newConfig = True
114        elif key == ord('a'):
115            if topLeft.x - stepSize >= 0:
116                topLeft.x -= stepSize
117                bottomRight.x -= stepSize
118                newConfig = True
119        elif key == ord('s'):
120            if bottomRight.y + stepSize <= 1:
121                topLeft.y += stepSize
122                bottomRight.y += stepSize
123                newConfig = True
124        elif key == ord('d'):
125            if bottomRight.x + stepSize <= 1:
126                topLeft.x += stepSize
127                bottomRight.x += stepSize
128                newConfig = True
129        elif key == ord('1'):
130            calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MEAN
131            print('Switching calculation algorithm to MEAN!')
132            newConfig = True
133        elif key == ord('2'):
134            calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MIN
135            print('Switching calculation algorithm to MIN!')
136            newConfig = True
137        elif key == ord('3'):
138            calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MAX
139            print('Switching calculation algorithm to MAX!')
140            newConfig = True
141        elif key == ord('4'):
142            calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MODE
143            print('Switching calculation algorithm to MODE!')
144            newConfig = True
145        elif key == ord('5'):
146            calculationAlgorithm = dai.SpatialLocationCalculatorAlgorithm.MEDIAN
147            print('Switching calculation algorithm to MEDIAN!')
148            newConfig = True
149
150        if newConfig:
151            config.roi = dai.Rect(topLeft, bottomRight)
152            config.calculationAlgorithm = calculationAlgorithm
153            cfg = dai.SpatialLocationCalculatorConfig()
154            cfg.addROI(config)
155            spatialCalcConfigInQueue.send(cfg)
156            newConfig = False

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