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ipa: raspberrypi: Add camera helper for Sony IMX296 sensor

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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 <naush@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Naushir Patuck 2020-11-26 10:49:49 +00:00 • committed by Laurent Pinchart
parent 3dc81300c7
commit f687116904
2 changed files with 70 additions and 0 deletions
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src/ipa/raspberrypi/cam_helper_imx296.cpp Normal file
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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Limited
*
* cam_helper_imx296.cpp - Camera helper for IMX296 sensor
*/
#include <algorithm>
#include <cmath>
#include <stddef.h>
#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);