From f687116904001cf9189bdf878d7c1e60b209c26a Mon Sep 17 00:00:00 2001 From: Naushir Patuck Date: Thu, 26 Nov 2020 10:49:49 +0000 Subject: ipa: raspberrypi: Add camera helper for Sony IMX296 sensor MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Sony IMX296 sensor has an exponential gain model, and adds a fixed 14.26µs offset to the exposure time expressed in line units. Signed-off-by: Naushir Patuck Signed-off-by: Laurent Pinchart Reviewed-by: Naushir Patuck Reviewed-by: Kieran Bingham --- src/ipa/raspberrypi/cam_helper_imx296.cpp | 69 +++++++++++++++++++++++++++++++ src/ipa/raspberrypi/meson.build | 1 + 2 files changed, 70 insertions(+) create mode 100644 src/ipa/raspberrypi/cam_helper_imx296.cpp (limited to 'src/ipa/raspberrypi') diff --git a/src/ipa/raspberrypi/cam_helper_imx296.cpp b/src/ipa/raspberrypi/cam_helper_imx296.cpp new file mode 100644 index 00000000..a1a771cb --- /dev/null +++ b/src/ipa/raspberrypi/cam_helper_imx296.cpp @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ +/* + * Copyright (C) 2020, Raspberry Pi (Trading) Limited + * + * cam_helper_imx296.cpp - Camera helper for IMX296 sensor + */ + +#include +#include +#include + +#include "cam_helper.hpp" + +using namespace RPiController; +using libcamera::utils::Duration; +using namespace std::literals::chrono_literals; + +class CamHelperImx296 : public CamHelper +{ +public: + CamHelperImx296(); + uint32_t GainCode(double gain) const override; + double Gain(uint32_t gain_code) const override; + uint32_t ExposureLines(Duration exposure) const override; + Duration Exposure(uint32_t exposure_lines) const override; + +private: + static constexpr uint32_t maxGainCode = 239; + static constexpr Duration timePerLine = 550.0 / 37.125e6 * 1.0s; + + /* + * Smallest difference between the frame length and integration time, + * in units of lines. + */ + static constexpr int frameIntegrationDiff = 4; +}; + +CamHelperImx296::CamHelperImx296() + : CamHelper(nullptr, frameIntegrationDiff) +{ +} + +uint32_t CamHelperImx296::GainCode(double gain) const +{ + uint32_t code = 20 * std::log10(gain) * 10; + return std::min(code, maxGainCode); +} + +double CamHelperImx296::Gain(uint32_t gain_code) const +{ + return std::pow(10.0, gain_code / 200.0); +} + +uint32_t CamHelperImx296::ExposureLines(Duration exposure) const +{ + return (exposure - 14.26us) / timePerLine; +} + +Duration CamHelperImx296::Exposure(uint32_t exposure_lines) const +{ + return exposure_lines * timePerLine + 14.26us; +} + +static CamHelper *Create() +{ + return new CamHelperImx296(); +} + +static RegisterCamHelper reg("imx296", &Create); diff --git a/src/ipa/raspberrypi/meson.build b/src/ipa/raspberrypi/meson.build index 176055f4..32897e07 100644 --- a/src/ipa/raspberrypi/meson.build +++ b/src/ipa/raspberrypi/meson.build @@ -21,6 +21,7 @@ rpi_ipa_sources = files([ 'cam_helper_ov5647.cpp', 'cam_helper_imx219.cpp', 'cam_helper_imx290.cpp', + 'cam_helper_imx296.cpp', 'cam_helper_imx477.cpp', 'cam_helper_imx519.cpp', 'cam_helper_ov9281.cpp', -- cgit v1.2.1