Loading...
Loading...
এই পরীক্ষায় এই টপিক থেকে ২টি প্রশ্ন — OCR ও GPS।
Options: (ক) Audio → Text • (খ) Image → Text ✓ • (গ) Video → Text • (ঘ) Binary → Decimal
OCR = Optical Character Recognition — ছবি/scan থেকে editable text।
| Tool | Type |
|---|---|
| Tesseract | Open-source (Google) |
| Adobe Acrobat OCR | Commercial PDF |
| ABBYY FineReader | Commercial |
| Google Lens | Mobile (Google) |
| Microsoft OneNote OCR | Built-in |
| AWS Textract / Azure Form Recognizer | Cloud |
| Tech | Function |
|---|---|
| OCR | Image → Text (printed/handwritten) |
| ICR | Intelligent Character Recognition (handwriting-focused) |
| Speech Recognition | Audio → Text (Siri, Alexa, dictation) |
| Speech Synthesis (TTS) | Text → Audio |
| Face Recognition | Identify person from face |
| Object Detection | Identify objects in image |
| Scene Recognition | Identify scene type |
বিকল্প: (ক) DHCP • (খ) Accelerometer • (গ) Gyroscope • (ঘ) Satellite Signal ✓
GPS = Global Positioning System — পৃথিবীর কক্ষপথের satellite থেকে signal নিয়ে location।
| তথ্য | বিবরণ |
|---|---|
| Full form | Global Positioning System |
| মালিক | US Department of Defense |
| প্রথম operational | 1995 (full 24-satellite constellation) |
| Total satellites | 31 active (24+spare) |
| Orbit altitude | ~20,200 km |
| Frequency | L1 (1575.42 MHz), L2 (1227.60 MHz) |
| Accuracy (civilian) | 5-10 meters |
| System | দেশ | Satellites |
|---|---|---|
| GPS | USA | 31 |
| GLONASS | রাশিয়া | 24 |
| Galileo | EU | 28 |
| BeiDou | চীন | 35 |
| NavIC (IRNSS) | ভারত | 7 |
| QZSS | জাপান | 4 (regional) |
| Sensor | কাজ |
|---|---|
| GPS | Location (satellite signal) |
| Accelerometer | Motion, tilt, orientation |
| Gyroscope | Rotation, angular velocity |
| Magnetometer | Compass direction |
| Proximity Sensor | Object near phone (e.g., during call) |
| Ambient Light | Auto-brightness |
| Barometer | Air pressure, altitude |
| Fingerprint | Biometric authentication |
| Face ID | Face recognition |
| Heart rate | (some phones/watches) |
Modern smartphone GPS combines:
| Technology | বিবরণ |
|---|---|
| IoT (Internet of Things) | Smart devices interconnected |
| AI/ML | Artificial Intelligence / Machine Learning |
| Robotics | Autonomous machines |
| AR/VR | Augmented / Virtual Reality |
| 3D Printing | Additive manufacturing |
| Drone | Unmanned Aerial Vehicle (UAV) |
| Self-driving | Autonomous vehicles |
| Smart Home | Connected appliances |
| Wearable | Smartwatch, fitness tracker |
| Voice Assistants | Siri, Alexa, Google Assistant |
| Category | উদাহরণ |
|---|---|
| Narrow AI | task-specific (Siri, ChatGPT, image recognition) |
| General AI | human-like (still hypothetical) |
| Super AI | beyond human (futuristic) |
| Type | বিবরণ |
|---|---|
| Supervised | labeled data দিয়ে train |
| Unsupervised | unlabeled data, pattern discovery |
| Reinforcement | reward-based learning |
| Deep Learning | neural networks (multi-layer) |
স্মার্ট টেকনোলজি — মূল লেকচার শিট — OCR/ICR/Speech Recognition-এর working principles, GPS/GLONASS/Galileo/BeiDou (সব GNSS), Smartphone sensors-এর পূর্ণাঙ্গ তালিকা, IoT (Internet of Things), AI/ML categories ও applications, Robotics ও Drone, AR/VR/MR, 3D Printing, Smart City ও Industry 4.0।