SimpleLPR

License Plate Recognition SDK

SimpleLPR Change Log

Track the evolution of SimpleLPR with version history and release notes

SimpleLPR 3.6.3.0 Latest
Released December 17, 2025
✨ New Features
  • Added comprehensive support for Uganda license plates, including standard formats (1999-2023), government ministries, military, police, diplomatic, and specialized vehicle categories
  • Added wrappers for Python 3.13 and 3.14
🔧 Improvements
  • Enhanced Ukraine template with support for electric vehicle plates using Latin alphabet series (YA-YZ), and diplomatic plates (D + 6 digits format)
🐛 Bug Fixes
  • Fixed two-line plate recognition issue where lines with significantly different character heights were not being grouped as a single plate
SimpleLPR 3.6.2.0
Released September 8, 2025
🐛 Bug Fixes
  • Fixed executable stack flag in libSimpleLPR3.so that prevented the library from loading in Docker containers and other security-hardened environments. The library now properly builds with the 'noexecstack' linker flag
  • Fixed coordinate reference issue in 'IProcessor.analyze' and 'IProcessorPool.launchAnalyze' methods when processing video frames with a Region of Interest (RoI). Results now correctly return coordinates relative to the full frame rather than the RoI origin
  • Resolved thumbnail extraction issue in 'IPlateCandidateTracker' where 'representativeThumbnail' would return incorrect image regions when frames were processed with RoI constraints
SimpleLPR 3.6.1.0
Released August 22, 2025
✨ New Features
  • Added comprehensive support for Malta license plates, including standard formats, government vehicles, taxis, and special vehicle categories
🔧 Improvements
  • Enhanced Andorra template with support for temporary (MT), dealer (PROVA), special vehicles, and personalized plates (2-5 characters)
  • Enhanced Mozambique template to support 'AA-NNN-AA' private vehicle plates and single-line diplomatic plate formats
  • Enhanced Russia template with transit/export plate support, including square two-line variants, paper transit plates ('AA NNNA NN'), and military trailer configurations
  • Upgraded GPU processing infrastructure to CUDA 12.9 for improved performance and compatibility
🐛 Bug Fixes
  • Resolved potential deadlock issue when processing multiple concurrent streams with varying input frame dimensions under CUDA acceleration
SimpleLPR 3.6.0.0
Released June 5, 2025
✨ New Features
  • Added 'IPlateCandidateTracker' class for tracking license plates across multiple video frames, providing temporal correlation resistant to OCR misreadings and partial detections
  • Added comprehensive samples in C#, Python, and C++ demonstrating the new plate tracking functionality
  • Added new interactive WPF sample application that displays captured license plates in real-time during video processing
🔧 Improvements
  • Updated Russia template to support three-digit region codes (1xx, 2xx, 3xx, 5xx, 6xx, 7xx, 9xx series) as per current regional coding system
  • Enhanced Azerbaijan template with support for diplomatic ('NNN A NNN'), motorcycle ('NN A NNN'), and newer 'A NNN AA' format license plates
SimpleLPR 3.5.9.0
Released February 19, 2025
✨ New Features
  • Added 'IProcessorPool' class to enable concurrent license plate recognition operations, improving throughput for multi-image processing scenarios
🐛 Bug Fixes
  • Fixed runtime dependency error caused by missing "libdl.so" shared library on Ubuntu 24.04 systems
  • Solved an issue where the evaluation mode was not being properly activated on specific Linux distribution profiles
SimpleLPR 3.5.8.0
Released December 24, 2024
✨ New Features
  • Added 'VideoSource' class for basic frame acquisition from video files and RTSP streams
  • Added a new overload to 'IProcessor.analyze' that accepts video frames from a 'VideoSource' instance
SimpleLPR 3.5.7.0
Released August 1, 2024
✨ New Features
  • Added wrapper for Python 3.12
SimpleLPR 3.5.6.0
Released June 3, 2024
🐛 Bug Fixes
  • Letter 'Q' is now correctly recognized in license plates from Azerbaijan
SimpleLPR 3.5.5.0
Released July 3, 2023
✨ New Features
  • Added support for license plates from Andorra
  • Added support for the latest 'AA AA NNN' license plate format introduced in 2022 for Hungary
SimpleLPR 3.5.5.0
Released July 3, 2023
✨ New Features
  • Added support for license plates from Andorra
  • Added support for the latest 'AA AA NNN' license plate format introduced in 2022 for Hungary
SimpleLPR 3.5.4.0
Released May 25, 2023
✨ New Features
  • Added wrappers for Python 3.10 and Python 3.11
  • Added support for license plates from Turkmenistan
  • Added support for Bharat pan-Indian license plates
SimpleLPR 3.5.3.0
Released March 15, 2023
🐛 Bug Fixes
  • Added missing light on dark license plate templates for India
  • Fixed the Mercosur motorcycle license plate templates from Brazil
SimpleLPR 3.5.2.0
Released February 28, 2023
✨ New Features
  • Added support for license plates from Mozambique
  • Added support for vintage, temporary, and diplomatic license plates from Spain
SimpleLPR 3.5.1.0
Released January 5, 2023
✨ New Features
  • Added new overloads to 'IProcessor.analyze' that take a JPEG, PNG or TIFF encoded image from a buffer in memory or a 'Stream' object
🔧 Improvements
  • Floating point exceptions are now disabled during execution of all variants of the 'IProcessor.analyze' call
  • Project migrated to Visual Studio 2022
  • Dependency libraries have been upgraded to their latest version
  • Dropped support for Windows 7 and Windows 8
SimpleLPR 3.5.0.0
Released November 21, 2022
✨ New Features
  • Added wrappers for Python 3.8 and Python 3.9
  • The 'SimpleLPR3.dll' assembly now targets .NET Standard 2.0 for better interop with the .NET Framework, .NET Core, and .NET

For the complete version history, please refer to the full documentation.

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