libcamera v0.0.0+3240-f2a18172-dirty (2022-05-13T20:32:10+00:00)
Supporting cameras in Linux since 2019
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A mean-based auto-exposure algorithm. More...
Public Member Functions | |
int | configure (IPAContext &context, const IPAConfigInfo &configInfo) override |
Configure the AGC given a configInfo. More... | |
void | process (IPAContext &context, const ipu3_uapi_stats_3a *stats) override |
Process IPU3 statistics, and run AGC operations. More... | |
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virtual int | configure (IPAContext &context, const IPAConfigInfo &configInfo) |
Configure the Algorithm given an IPAConfigInfo. More... | |
virtual void | prepare (IPAContext &context, ipu3_uapi_params *params) |
Fill the params buffer with ISP processing parameters for a frame. More... | |
virtual void | process (IPAContext &context, const ipu3_uapi_stats_3a *stats) |
Process ISP statistics, and run algorithm operations. More... | |
A mean-based auto-exposure algorithm.
This algorithm calculates a shutter time and an analogue gain so that the average value of the green channel of the brightest 2% of pixels approaches 0.5. The AWB gains are not used here, and all cells in the grid have the same weight, like an average-metering case. In this metering mode, the camera uses light information from the entire scene and creates an average for the final exposure setting, giving no weighting to any particular portion of the metered area.
Reference: Battiato, Messina & Castorina. (2008). Exposure Correction for Imaging Devices: An Overview. 10.1201/9781420054538.ch12.
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overridevirtual |
Configure the AGC given a configInfo.
[in] | context | The shared IPA context |
[in] | configInfo | The IPA configuration data |
Reimplemented from libcamera::ipa::ipu3::Algorithm.
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overridevirtual |
Process IPU3 statistics, and run AGC operations.
[in] | context | The shared IPA context |
[in] | stats | The IPU3 statistics and ISP results |
Identify the current image brightness, and use that to estimate the optimal new exposure and gain for the scene.
Reimplemented from libcamera::ipa::ipu3::Algorithm.