Table of Contents
Recognition Cards
PictoBlox Block

analyse image from ()

Description

To execute object detection, we use analyse image from () blocks. You can input the image in the following ways:

  1. Camera feed
  2. Stage

This block analyses the image and saves the face information locally, which can be accessed using other blocks.

You have to run this block every time you want to analyze a new image from the camera or stage.

Example

AI Delivery Robot

The example demonstrates how to make a delivery robot that follows the line and stops when it reaches checkpoint 1.
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Script

Alert: You need to calibrate the IR sensor to get the best line detection by the robot. Also, you need to calibrate the speeds to make the robot follow the line correctly.

Output

 

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Sign Detection – Tobi

The example demonstrates how to implement sign detection in PictoBlox.
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Script

Output

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Face Tracking Controlled Quadruped

Learn about face-tracking, and how to code a face-tracking Quadruped robot using sensors and computer vision techniques.
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Activity Description

In this activity, students will program Quarky to detect a face’s position using the camera and respond with movements. Based on which direction the face is (left, right, or center), Quarky will display a pattern and move accordingly. This teaches camera-based input, angle calculations, and conditional movements.

Let’s Learn

  1. Open the PictoBlox application from the Start Menu.
  2. Select the inviting realm of Blocks as your coding environment.
  3. Connect “Quarky” to your computer using a USB cable. Then, click the Board button in the toolbar and Select Board as Quarky.
  4. Next, select the appropriate Serial port if the Quarky is connected via USB or the Bluetooth Port if you want to connect Quarky via Bluetooth and press Connect.
  5. Click on the Add Extension button and add the Quarky Quadruped extension.
  6. Add when flag clicked block from the Event Palette. This block helps you to start the script.
  7. To set up the quadruped, you can drag and drop pins for each leg and hip into the initialisation block using set pins FR Hip () FL Hip () FR Leg () FL Leg() BR Hip () BL Hip () BR Leg () BL Leg () blocks. This block sets which pins on the Quarky controller board control each servo motor for the front right (FR), front left (FL), back right (BR), and back left (BL) hips and legs. Drag this block and set each PIN as shown.  FR Hip: 4, FL Hip: 1, FR Leg: 8, FL Leg: 5, BR Hip: 3, BL Hip: 2, BR Leg: 7, BL Leg: 6.
  8. Turn on the camera video on the stage with 0% transparency so it remains visible.
  9. Begin a forever loop to keep checking the face’s position continuously.
  10. Use the analyse image from camera block to start facial recognition.
  11. Declare the Variable ‘Angle’ Place get () of the face () at the first place of addition () + (), and 3 at the second place. From the dropdown, select X position.
  12. Set the variable Angle by calculating 90 + (x position of face ÷ 3) to decide how far the face is from the center.
  13. Use if-else blocks to respond based on the face’s horizontal position: If Angle > 90: Face is on the right side, show a face on the LED matrix and move left using “lateral left” motion.
  14. Else if Angle < 90: Face is on the left side, show a face and move right using “lateral right” motion.
  15. Else (Angle = 90): Face is centered, Show a smiley face and move to the home (neutral) position.
Note: Check by changing the angle value and also try to change the icons in the display matrix as L for left and R for right sid directions.

Output

Our next step is to check whether it is working right or not. Whenever your face will come in front of the camera, it should detect it and as you move to the right or left, the head of your  Quadruped robot should also move accordingly.

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Gesture Controlled Gripper Mecanum

In this activity, learn how to create a new Machine Learning model that will be able to identify and detect different types of hand poses and that can help us to control the Mecanum Gripper Robot.
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In this activity, we will try to create a new Machine Learning model that will be able to identify and detect different types of hand poses and that can help us to control the Mecanum Gripper Robot. This activity can be quite fun and by knowing the process, you can develop your own customized hand pose classifier model easily!

We will use the same model that we have created in the previous Hand Pose Controlled Mecanum model to avoid any misdirection and confusion.

Note: You can always create your own model and use it to perform any type of functions as per your choice. This example proves the same point and helps you understand well the concept of Machine Learning models and environment.

Hand Gesture Classifier Workflow

Follow the steps below:

  1. Open PictoBlox and create a new file.
  2. Select the Block coding environment as appropriate Coding Environment.
  3. Select the “Open ML Environment” option under the “Files” tab to access the ML Environment.
  4. Click on “Create New Project“.
  5. A window will open. Type in a project name of your choice and select the “Hand Gesture Classifier” extension. Click the “Create Project” button to open the Hand Pose Classifier window.
  6. You shall see the Classifier workflow with two classes already made for you. Your environment is all set. Now it’s time to upload the data.

Class in Hand Gesture Classifier

There are 2 things that you have to provide in a class:

  1. Class Name: It’s the name to which the class will be referred as.
  2. Hand Pose Data: This data can either be taken from the webcam or by uploading from local storage.

Note: You can add more classes to the projects using the Add Class button.
Adding Data to Class

You can perform the following operations to manipulate the data into a class.

  1. Naming the Class: You can rename the class by clicking on the edit button.
  2. Adding Data to the Class: You can add the data using the Webcam or by Uploading the files from the local folder.
    1. Webcam:
Note: You must add at least 20 samples to each of your classes for your model to train. More samples will lead to better results.
Training the Model

After data is added, it’s fit to be used in model training. In order to do this, we have to train the model. By training the model, we extract meaningful information from the hand pose, and that in turn updates the weights. Once these weights are saved, we can use our model to make predictions on data previously unseen.

The accuracy of the model should increase over time. The x-axis of the graph shows the epochs, and the y-axis represents the accuracy at the corresponding epoch. Remember, the higher the reading in the accuracy graph, the better the model. The range of the accuracy is 0 to 1.

Testing the Model

To test the model, simply enter the input values in the “Testing” panel and click on the “Predict” button.

The model will return the probability of the input belonging to the classes.

Export in Block Coding

Click on the “Export Model” button on the top right of the Testing box, and PictoBlox will load your model into the Block Coding Environment if you have opened the ML Environment in the Block Coding.

Logic

The mecanum will move according to the following logic:

  1. If the detected class is “forward”, we will make the Mecanum move forward.
  2. When the backward gesture is detected – Mecanum will move backwards.
  3. When the Lateral Left gesture is detected – Mecanum will move towards the left direction laterally with the help of its omnidirectional wheels.
  4. When the Lateral Right gesture is detected – Mecanum will move towards the right direction laterally with the help of its omnidirectional wheels.
  5. When the Normal Right gesture is detected – Mecanum will rotate on a single point towards the right direction.
  6. When the Normal Left gesture is detected – Mecanum will rotate on a single point towards the left direction.
  7. When the “Stop” class gesture is detected, we will use the gripper functions of the Mecanum and Pick the object.
  8. When the “Circular Motion ” class is detected, we will use the gripper functions of the Mecanum and Drop the object by opening the arms of the gripper robot.

Code

Initialization

Main Code

 

Output

Forward-Backward Motion:

Circular Right-Left Motion:

Lateral Right-Left Motions:

Gripper Mechanism with Hand Gestures:

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PictoBlox Extensions
  1. Scratch Based Default Extensions
    1. Motion
    2. Looks
    3. Sound
    4. Control
    5. Events
    6. Sensing
    7. Operators
    8. My Blocks
    9. Variables
  2. Artificial Intelligence
    1. Face Detection
    2. Object Detection
    3. Human Body Detection
    4. Computer Vision
    5. Text Recognition
    6. Speech Recognition
    7. ChatGPT
    8. Natural Language Processing
    9. Recognition Cards
    10. Text to Speech
    11. Translate
    12. Open CV
  3. Innovative Extensions
    1. QR Code Scanner
    2. Weather Data
    3. Physics Engine
    4. IFTTT Webhooks
    5. Internet of Things (IoT)
    6. Data Logger
    7. Music
    8. Video Sensing
    9. Pen
  4. Machine Learning Environment
    1. Image Classifier (ML)
    2. Object Detection (ML)
    3. Pose Classifier (ML)
    4. Hand Pose Classifier (ML)
    5. Audio Classifier (ML)
    6. Number Classifier and Regression (ML)
    7. Text Classifier (ML)
  5. Quarky
    1. Quarky (Main)
    2. Display (Quarky)
    3. Robot (Quarky)
    4. Sensors (Quarky)
    5. Speaker (Quarky)
    6. Quarky Ultimate Robots
    7. Quarky Expansion Board
    8. Mars Rover
    9. Humanoid (Quarky)
    10. Quadruped (Quarky)
    11. IoT House (Quarky)
    12. Quarky Mecanum
    13. Quarky Robotic Arm
    14. Dabble
    15. Quarky Advance Line Following

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