Add CHANGELOG

Author: marcodebe

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+---
+
+## [Unreleased]
+
+### Documentation
+- Rewrote README in English: added About section, Features list, options table, layout table, configuration section, and authors
+
+---
+
+## [1.4.0] — 2026-03-14
+
+Major refactor: the monolithic `ECG` class has been split into focused modules and the `scipy` dependency has been removed.
+
+### Added
+- `ecg/reader.py` — DICOM reading and metadata extraction
+- `ecg/processor.py` — waveform signal extraction and scaling
+- `ecg/plotter.py` — Matplotlib rendering logic
+- `ecg/dsp.py` — pure-Python DSP (Butterworth lowpass filter), replacing `scipy`
+- `--paper letter` option in the CLI
+- Graceful error handling in the CLI (invalid files, missing tags)
+
+### Changed
+- Lead labels now resolved via DICOM `CodeValue` lookup instead of text manipulation
+- DICOM date and patient age parsing made more robust (handles missing or malformed tags)
+- All internal comments and docstrings translated from Italian to English
+
+### Removed
+- `scipy` dependency
+
+---
+
+## [1.3.5] — 2025-07-25
+
+### Fixed
+- Plot area height calculation was incorrect in some layouts
+- 6×2 layout was rendering lead V1 twice instead of the correct lead pair
+
+---
+
+## [1.3.3] — 2022-01-28
+
+### Fixed
+- Unknown or missing `VRate` tag no longer raises an unhandled exception
+
+---
+
+## [1.3.2] — 2021-04-13
+
+### Fixed
+- Acquisition date/time missing or malformed in DICOM no longer causes a crash
+
+---
+
+## [1.3.1] — 2020-11-11
+
+### Fixed
+- `papertype` argument removed from `savefig` call (deprecated in Matplotlib)
+- `MaxNLocator` / `AutoMinorLocator` `numticks` argument coerced to `int`
+- WADO response decoded as binary string correctly
+- Broken pip package from previous release
+
+---
+
+## [1.3.0] — 2020-05-11
+
+### Added
+- Ventricular rate read from the `VRate` DICOM tag
+
+---
+
+## [1.2.0] — 2019-09-06
+
+### Changed
+- Project renamed from `dicomecg_convert` to `dicom-ecg-plot` and published on PyPI
+- Migrated to `pydicom` (dropped the legacy `dicom` import)
+- Binary output to stdout handled correctly on Python 3
+
+---
+
+## [1.1.0] — 2018-02-26
+
+### Changed
+- Full Python 2 → Python 3 migration
+
+---
+
+## [1.0.0] — 2016-07-18
+
+### Fixed
+- WADO `contentType` set to `application/dicom`
+
+---
+
+## Earlier history (2013–2015)
+
+- **2015** — Strip microseconds from acquisition date; handle invalid DICOM gracefully
+- **2014** — Optional automated interpretation text (`--interpretation`); i18n/l10n support
+- **2013** — Initial release: DICOM waveform decoding, 3×4+1 / 3×4 / 6×2 layouts, WADO retrieval, Butterworth lowpass filter, configurable institution name, multiple output formats
+
+[Unreleased]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/compare/v1.4.0...HEAD
+[1.4.0]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/compare/v1.3.5...v1.4.0
+[1.3.5]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/compare/v1.3.3...v1.3.5
+[1.3.3]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/compare/v1.3.0...v1.3.3
+[1.3.2]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.3.2
+[1.3.1]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.3.1
+[1.3.0]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.3.0
+[1.2.0]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.2.0
+[1.1.0]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.1.0
+[1.0.0]: https://gitlab.galliera.it/debe/dicom-ecg-plot/-/tags/v1.0.0