Embedded Files
一通りの画像処理が基本的なノードだけで可能になったので、基本的なフローの書き方を説明します。
C2025 A6 20251110-180127010 スクリーンショット.pngこのフローはシグマフィルタリング後にスタックし、画像を調整します。
大まかな流れを左上から説明します。
左上の画像読み込みが完成形のひな型になる基準画像です。
この画像は fits の raw データなので、ベイヤー分割しRGBGのプレーンに分けてズレ検出の補正値とします。
左2段目の画像読み込みがライトフレーム、3段目がダークフレーム、4段目がフラットフレームです。
ライトフレーム(ここでは70枚)をダーク減算、フラット除算、ベイヤー分割し、ズレ検出にデータとして送る込みます。
ズレ検出からはズレ補正の情報が出力されます。これとライトフレームを変形に送り込みます。
変形で位置合わせが行われた画像がシグマフィルタリングに送られます。
シグマフィルタリング内で平均値から標準偏差を計算し、1.5σ 以上外れたピクセルを NaN にします。
1.5σ はシグマフィルタリングの右端にある係数で設定しています。
シグマフィルタリング後の画像を平均へ送り込みます。ここで1枚にスタックされます。
スタック画像の端の余分な部分をトリミングします。
スタック画像は背景フラットに送られ、2次関数近似を計算しそれを減算します。
以上で前処理が終了です。
以降、トーンカーブによる強調、色ノイズ除去、輝度ノイズ除去を行います。
最後に画像書き出しです。
最後の色ノイズ、輝度ノイズはフローを説明する為に、かなり簡単な処理にしています。
ぼかし用の表(カーネル)をもっと大きくしたり、離散ウェーブレット変換(DWT)を多段にするなどし、
強く加工すれば、トーンカーブをもっと追い込むことも可能でしょう。
逆に元画像に飛行機などの写り込みが無ければ、
シグマフィルタリングを飛ばして平均(スタック)するとよいでしょう。
2026-06-22
基準画像
加工画像
フローファイル
フローファイル
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