How to set property in pivariety camera using libcam

Raspberry Pi Cameras libcamera
1

Hi wong,
As per your guidance

successfully accessed pivariety camera ,now I am trying to set camera property like Brightness ,Contrast,Exposure,and so on .if it is possible to access those properties via provided libcamera_cpp_demo-master.zip .
please provide me support to over come this issues. Thank in advance

2

Hi, Balaji

You can refer to the code below to set the camera frame rate, brightness, contrast and exposure time parameters.

    ControlList controls_;
    int64_t frame_time = 1000000 / 30;
    // Set frame rate
	controls_.set(controls::FrameDurationLimits, { frame_time, frame_time });
    // Adjust the brightness of the output images, in the range -1.0 to 1.0
    controls_.set(controls::Brightness, 0.5);
    // Adjust the contrast of the output image, where 1.0 = normal contrast
    controls_.set(controls::Contrast, 1.5);
    // Set the exposure time
    controls_.set(controls::ExposureTime, 20000);
    cam.set(controls_);

For other control items, you can refer to the link below.

libcamera Controls

3

Thank Yang,
I have an doubt regarding of FrameDurationTime , what’s mean by frame_time= 1000000/30 ,is that FramePerSecond or anything else.Kindly please give an clarification about FrameRate . Thank you in advance

4

The duration of each frame is in microseconds.
1000000us=1000ms=1s