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diff --git a/src/ipa/raspberrypi/controller/rpi/sharpen.hpp b/src/ipa/raspberrypi/controller/rpi/sharpen.hpp
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+++ b/src/ipa/raspberrypi/controller/rpi/sharpen.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * sharpen.hpp - sharpening control algorithm
+ */
+#pragma once
+
+#include "../algorithm.hpp"
+#include "../sharpen_status.h"
+
+// This is our implementation of the "sharpen algorithm".
+
+namespace RPi {
+
+class Sharpen : public Algorithm
+{
+public:
+	Sharpen(Controller *controller);
+	char const *Name() const override;
+	void SwitchMode(CameraMode const &camera_mode) override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Prepare(Metadata *image_metadata) override;
+
+private:
+	double threshold_;
+	double strength_;
+	double limit_;
+	std::atomic<double> mode_factor_;
+};
+
+} // namespace RPi