CRS Sensors, I/O & Vision Systems 2 — Questions and Answers
Question 1: In machine vision for robotics, what does the term 'calibration' primarily accomplish?
- Maps pixel coordinates to real-world physical coordinates (Correct answer)
- Adjusts the camera aperture for ambient lighting
- Compresses image data for faster network transmission
- Converts color images to grayscale for processing
Correct answer: Maps pixel coordinates to real-world physical coordinates
Camera calibration determines the intrinsic and extrinsic parameters that allow the system to translate pixel locations in an image into accurate X-Y-Z positions in the robot's working frame.
Question 2: What is a structured light 3D scanner used for in a robotic work cell?
- Capturing dense 3D point clouds of part surfaces for bin picking or inspection (Correct answer)
- Measuring the electromagnetic spectrum of part colors
- Providing real-time thermal imaging of the robot arm
- Transmitting commands to the robot controller wirelessly
Correct answer: Capturing dense 3D point clouds of part surfaces for bin picking or inspection
Structured light scanners project known light patterns onto a surface and use camera-based triangulation to reconstruct a high-density 3D model of the object for tasks like bin picking and dimensional inspection.
Question 3: What does 'blob detection' accomplish in a robotic machine vision system?
- Identifies and measures connected regions of similar pixel intensity in an image (Correct answer)
- Detects random noise artifacts in the camera sensor
- Measures the distance between the camera and a target
- Compares images to a CAD model of the part
Correct answer: Identifies and measures connected regions of similar pixel intensity in an image
Blob detection segments an image into regions of uniform brightness or color and extracts properties such as area, centroid, and orientation, which the robot uses to locate and pick parts.
Question 4: Which communication interface is most commonly used to connect industrial area-scan cameras to a robot's vision processor?
- GigE Vision (Gigabit Ethernet) (Correct answer)
- RS-232 serial
- Modbus RTU
- CAN bus
Correct answer: GigE Vision (Gigabit Ethernet)
GigE Vision is the dominant standard for industrial cameras, providing high-bandwidth image streaming over standard Ethernet with a standardized GenICam control interface.
Question 5: In a 2D machine vision system, what does the 'field of view' (FOV) determine?
- The physical area of the scene captured by the camera at a given working distance (Correct answer)
- The maximum frame rate the camera can achieve
- The color depth of the captured image
- The lens focal length in millimeters
Correct answer: The physical area of the scene captured by the camera at a given working distance
The field of view defines the actual physical dimensions (width × height) of the scene imaged at a specific working distance, directly affecting what portion of the workspace is visible to the robot.
Question 6: What is the advantage of using a 3D time-of-flight (ToF) camera over a 2D camera in a robotic bin-picking application?
- It provides depth information for each pixel without requiring structured light projection (Correct answer)
- It offers higher pixel resolution than area-scan cameras
- It operates only in the visible light spectrum
- It eliminates the need for lighting in the work cell
Correct answer: It provides depth information for each pixel without requiring structured light projection
ToF cameras measure the round-trip time of emitted light pulses to calculate per-pixel depth, giving the robot direct 3D spatial data to locate randomly oriented parts in a bin.
Question 7: Why is consistent, controlled lighting critical in a robotic machine vision application?
- It ensures repeatable image contrast so the vision algorithm produces reliable results regardless of ambient conditions (Correct answer)
- It allows the camera to operate at a lower frame rate
- It increases the pixel resolution of the sensor
- It reduces the need for camera calibration
Correct answer: It ensures repeatable image contrast so the vision algorithm produces reliable results regardless of ambient conditions
Controlled lighting eliminates variability caused by ambient light changes, shadows, and reflections, ensuring that the vision algorithm always sees consistent image features and maintains reliable detection accuracy.
CRS Sensors, I/O & Vision Systems 2
In machine vision for robotics, what does the term 'calibration' primarily accomplish?