ipa: rpi: Add "focus" algorithm

Adds FocusStatus to the image metadata, containing contrast measurements
across the image. Optionally also prints a contrast measure to the
console, to aid in manual adjustment of the lens. Note that it is not an
actual auto-focus algorithm that can drive a lens!

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/focus.hpp b/src/ipa/raspberrypi/controller/rpi/focus.hpp
new file mode 100644
index 00000000..d53401f7
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/rpi/focus.hpp
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2020, Raspberry Pi (Trading) Limited
+ *
+ * focus.hpp - focus algorithm
+ */
+#pragma once
+
+#include "../algorithm.hpp"
+#include "../metadata.hpp"
+
+/*
+ * The "focus" algorithm. All it does it print out a version of the
+ * focus contrast measure; there is no actual auto-focus mechanism to
+ * control.
+ */
+
+namespace RPi {
+
+class Focus : public Algorithm
+{
+public:
+	Focus(Controller *controller);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Process(StatisticsPtr &stats, Metadata *image_metadata) override;
+private:
+	bool print_;
+};
+
+} /* namespace RPi */