Rico贾若童的博客

Computation Tools - OpenCV, PCL, PCD, NanoFLANN

A Running List of Computer Vision Tools

OpenCV Image Processing cv::Mat Create a cv::Mat In C++: 1 2 3 4 5 6 7 8 // method 1 cv::Mat(another_mat); // method 2 cv::Mat A = (cv::Mat_<uchar>(1,2)<<1,2); //CV_8U // method ...

Posted by Rico's Nerd Cluster on May 9, 2024

Things About Leetcode Before That Coding Interview

Leetcode IDE Tips, Common Leetcode Problems, C++ Commands, String

Introduction At the bare minimum, it’s good to have a solid understanding of 2 Pointers, sliding window, BFS/DFS, Trees, Graphs, Stacks, Queus, Hash Maps. Leetcode IDE Tips No Global Variables ...

Posted by Rico's Nerd Cluster on May 1, 2024

Foundamental Structure of Programs

Callstack

Callstack A callstack is a stack of frames, where a frame represents an active call. Each frame has: return address (where the function returns after it completes), local variables. E.g., if func...

Posted by Rico's Nerd Cluster on May 1, 2024

C++ - Rounding

llround llround follows round half away from zero (not bankers rounding)., and returns long long 1 2 3 4 5 6 7 std::llround(2.3) → 2 std::llround(2.5) → 3 std::llround(2.7) → 3 std::llr...

Posted by Rico's Nerd Cluster on April 18, 2024

Robotics - [2D SLAM 1] Hands-On Mapping

Point-Point ICP, Point-Line ICP

🧪 Loop Detection Testing Procedure Phase 1: Baseline Verification (No Loop Closure) Objective: Confirm that submaps are constructed correctly before enabling loop closure. Steps: Disable loo...

Posted by Rico's Nerd Cluster on April 16, 2024

C++ - Specifiers

Declaration-Only Specifiers

Declaration Only Specifiers These specifiers will only appear in an .hpp file, not in .cpp files. Keyword What it does virtual Marks a member as p...

Posted by Rico's Nerd Cluster on April 16, 2024

C++ - Filesystem

std::filesystem::create_directory(path) Thread safety: std::filesystem::create_directory(path); under the hood it issues a single POSIX mkdir() (or the platform equivalent). If the ...

Posted by Rico's Nerd Cluster on April 14, 2024

Robotics - [2D SLAM 2] Map Generation

Submap Generation

Submap Generation In modern robotics mapping systems, efficient environment representation and robust localization are achieved by dividing the map into smaller, manageable submaps. Each submap is...

Posted by Rico's Nerd Cluster on April 13, 2024

C++ - Segfaults

Out-of-bounds Iterator Access, Core Dump

Out-of-bounds Iterator Access Out-of-bounds iterator access is an undefined behavior, which might give a segfault, or give a garbage value. 1 2 3 4 5 6 7 8 9 10 11 12 #include <vector> #inc...

Posted by Rico's Nerd Cluster on April 12, 2024

Robotics - [2D SLAM 1] Introduction and Scan Matching

Point-Point ICP, Point-Line ICP

Introduction The assumption of a robot moving on a 2D plane is a strong one. However, many indoor robots do have support an assumption. Maps in this case can simply be interpreted as an image. Low...

Posted by Rico's Nerd Cluster on April 10, 2024

Rico's Nerd Cluster

Computation Tools - OpenCV, PCL, PCD, NanoFLANN

A Running List of Computer Vision Tools

Things About Leetcode Before That Coding Interview

Leetcode IDE Tips, Common Leetcode Problems, C++ Commands, String

Foundamental Structure of Programs

Callstack

C++ - Rounding

Robotics - [2D SLAM 1] Hands-On Mapping

Point-Point ICP, Point-Line ICP

C++ - Specifiers

Declaration-Only Specifiers

C++ - Filesystem

Robotics - [2D SLAM 2] Map Generation

Submap Generation

C++ - Segfaults

Out-of-bounds Iterator Access, Core Dump

Robotics - [2D SLAM 1] Introduction and Scan Matching

Point-Point ICP, Point-Line ICP

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