MZ-IME Japanese Input

What is this?

This is MZ-IME Japanese Input (mzimeja). This program is a Japanese Input Method Editor (IME) for Windows.

Hotkey Support

For non-Japanese keyboards (e.g., US, German layouts), you can toggle the IME ON/OFF using Alt+~ (Alt+VK_OEM_3).

Vibrato Support (Optional)

MZ-IMEja supports the high-performance morphological analysis engine Vibrato for faster and more accurate kana-kanji conversion.

Expected Benefits

Note: The following performance improvements are estimated targets based on Vibrato's capabilities. Actual performance will be measured once the full implementation is complete.

• 3x faster conversion compared to the legacy engine (target)
• Improved accuracy through better morphological analysis (target)
• Compact dictionary using Vibrato's efficient storage format (target)
• License: MIT / Apache 2.0 (compatible with GPLv3)

Build with Vibrato

Prerequisites

• Rust 1.70 or later
• Cargo

Steps

# Install Rust (if not already installed)
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

# Convert dictionary (optional - requires Vibrato tools)
bash tools/convert_mecab_dict.sh

# Build with Vibrato support
mkdir build && cd build
cmake .. -DUSE_VIBRATO=ON
cmake --build .

Build without Vibrato

mkdir build && cd build
cmake .. -DUSE_VIBRATO=OFF
cmake --build .

Performance Comparison

Engine	Speed	Memory	Dictionary Size
Legacy	1.0x (baseline)	~30MB	~15MB
Vibrato	3.0x (target)	~15MB (target)	~7.5MB (target)

Note: Performance numbers are estimated targets and will be validated once the implementation is complete.

Fallback Behavior

When Vibrato is enabled but not available (e.g., dictionary not found), MZ-IMEja automatically falls back to the legacy conversion engine. This ensures the IME continues to function even if Vibrato initialization fails.

License

• MZ-IMEja: GPLv3
• Vibrato: MIT / Apache 2.0

For more details, please refer to README_ja.txt (Japanese documentation).