Hi Dion,
thank you very much for the answer!
I already worked with this document a long time and maybe I am just missing something.
The goal: I want to increase the image brightness for a 30fps video especially at low light conditions.
I tried to increase it via "base_ev " which is useless (dimming is working though), since a maximum “gain” of “6” is allowed. → Even with default “base_ev” the image wants to get brighter, but it simply can not, due to the limited gain list in the tuning file.
If I then just increase the allowed “gain” values (up to “10.0”) the image looks perfect at low light conditions, but at daylight a flashing occurs. The “AGC” seems to go crazy.
Can you reproduce the problem by just extending the gain list in the tuning file up to 10.
Am I doing something wrong or is the problem out of my hand?
I am using just a simple "libcamera-vid -n -t 0 --width 1920 --height 1080 --framerate 30 -b 3000000… " command and the following tuning file where only the “gain” list is extended until “10.0”:
{
"version": 2.0,
"target": "bcm2835",
"algorithms": [
{
"rpi.focus":{
}
},
{
"rpi.black_level":
{
"black_level": 4096
}
},
{
"rpi.dpc":
{
}
},
{
"rpi.lux":
{
"reference_shutter_speed": 29966,
"reference_gain": 2.03,
"reference_aperture": 1.0,
"reference_lux": 910,
"reference_Y": 13551
}
},
{
"rpi.noise":
{
"reference_constant": 0,
"reference_slope": 2.271
}
},
{
"rpi.geq":
{
"offset": 151,
"slope": 0.00766
}
},
{
"rpi.sdn":
{
"deviation":3.7,
"strength":0.75
}
},
{
"rpi.awb":
{
"priors":
[
{
"lux": 0, "prior":
[
2000, 1.0, 3000, 0.0, 13000, 0.0
]
},
{
"lux": 800, "prior":
[
2000, 0.0, 6000, 2.0, 13000, 2.0
]
},
{
"lux": 1500, "prior":
[
2000, 0.0, 4000, 1.0, 6000, 6.0, 6500, 7.0, 7000, 1.0, 13000, 1.0
]
}
],
"modes":
{
"auto":
{
"lo": 2500,
"hi": 8000
},
"incandescent":
{
"lo": 2500,
"hi": 3000
},
"tungsten":
{
"lo": 3000,
"hi": 3500
},
"fluorescent":
{
"lo": 4000,
"hi": 4700
},
"indoor":
{
"lo": 3000,
"hi": 5000
},
"daylight":
{
"lo": 5500,
"hi": 6500
},
"cloudy":
{
"lo": 7000,
"hi": 8600
}
},
"bayes": 1,
"ct_curve":
[
2700.0, 0.8952, 0.3556, 3000.0, 0.8303, 0.3715, 4000.0, 0.6272, 0.4695, 4150.0, 0.5957, 0.4938, 6500.0, 0.4706, 0.6255
],
"sensitivity_r": 1.0,
"sensitivity_b": 1.0,
"transverse_pos": 0.01339,
"transverse_neg": 0.01002
}
},
{
"rpi.agc":
{
"metering_modes":
{
"centre-weighted":
{
"weights":
[
3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0
]
},
"spot":
{
"weights":
[
2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
]
},
"matrix":
{
"weights":
[
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
]
}
},
"exposure_modes":
{
"normal":
{
"shutter":
[
100, 10000, 30000, 30100, 30200, 30300, 30400, 30500
],
"gain":
[
1.0, 2.0, 4.0, 6.0, 7.0, 8.0, 9.0, 10.0
]
},
"short":
{
"shutter":
[
100, 5000, 10000, 20000, 120000
],
"gain":
[
1.0, 2.0, 4.0, 6.0, 6.0
]
}
},
"constraint_modes":
{
"normal":
[
{
"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target":
[
0, 0.5, 1000, 0.5
]
}
],
"highlight":
[
{
"bound": "LOWER", "q_lo": 0.98, "q_hi": 1.0, "y_target":
[
0, 0.5, 1000, 0.5
]
},
{
"bound": "UPPER", "q_lo": 0.98, "q_hi": 1.0, "y_target":
[
0, 0.8, 1000, 0.8
]
}
]
},
"y_target":
[
0, 0.16, 1000, 0.165, 10000, 0.17
]
}
},
{
"rpi.alsc":
{
"omega": 1.3,
"n_iter": 100,
"luminance_strength": 0.5,
"calibrations_Cr":
[
{
"ct": 6500, "table":
[
2.189, 2.197, 2.203, 2.204, 2.203, 2.195, 2.189, 2.189, 2.189, 2.194, 2.204, 2.212, 2.215, 2.218, 2.213, 2.211,
2.196, 2.202, 2.206, 2.205, 2.201, 2.192, 2.189, 2.183, 2.184, 2.191, 2.198, 2.211, 2.218, 2.219, 2.218, 2.213,
2.198, 2.206, 2.206, 2.205, 2.199, 2.191, 2.182, 2.177, 2.177, 2.184, 2.196, 2.207, 2.219, 2.225, 2.225, 2.219,
2.199, 2.206, 2.206, 2.202, 2.197, 2.187, 2.176, 2.164, 2.164, 2.177, 2.188, 2.205, 2.218, 2.229, 2.229, 2.223,
2.203, 2.203, 2.204, 2.199, 2.194, 2.178, 2.164, 2.147, 2.142, 2.163, 2.178, 2.199, 2.216, 2.228, 2.228, 2.224,
2.206, 2.206, 2.203, 2.199, 2.192, 2.175, 2.149, 2.139, 2.133, 2.139, 2.165, 2.193, 2.212, 2.225, 2.225, 2.224,
2.208, 2.208, 2.208, 2.203, 2.193, 2.175, 2.149, 2.139, 2.133, 2.139, 2.165, 2.193, 2.211, 2.225, 2.225, 2.224,
2.215, 2.217, 2.217, 2.213, 2.204, 2.189, 2.172, 2.149, 2.147, 2.162, 2.172, 2.194, 2.211, 2.223, 2.223, 2.223,
2.222, 2.224, 2.229, 2.226, 2.214, 2.204, 2.188, 2.172, 2.171, 2.172, 2.184, 2.198, 2.211, 2.221, 2.221, 2.217,
2.224, 2.231, 2.233, 2.231, 2.226, 2.214, 2.201, 2.188, 2.184, 2.184, 2.191, 2.198, 2.211, 2.212, 2.214, 2.207,
2.224, 2.233, 2.235, 2.234, 2.229, 2.219, 2.209, 2.198, 2.191, 2.191, 2.196, 2.201, 2.203, 2.208, 2.204, 2.195,
2.219, 2.226, 2.234, 2.234, 2.231, 2.222, 2.212, 2.203, 2.196, 2.196, 2.198, 2.202, 2.202, 2.203, 2.195, 2.192
]
}
],
"calibrations_Cb":
[
{
"ct": 6500, "table":
[
1.329, 1.329, 1.329, 1.337, 1.347, 1.355, 1.363, 1.367, 1.366, 1.359, 1.351, 1.342, 1.331, 1.321, 1.319, 1.317,
1.329, 1.329, 1.334, 1.339, 1.349, 1.358, 1.367, 1.373, 1.373, 1.366, 1.356, 1.344, 1.333, 1.322, 1.319, 1.315,
1.329, 1.334, 1.339, 1.349, 1.356, 1.365, 1.373, 1.379, 1.376, 1.373, 1.361, 1.348, 1.339, 1.329, 1.319, 1.315,
1.337, 1.343, 1.349, 1.356, 1.365, 1.374, 1.379, 1.383, 1.383, 1.376, 1.367, 1.356, 1.346, 1.337, 1.327, 1.319,
1.345, 1.351, 1.358, 1.366, 1.374, 1.379, 1.384, 1.387, 1.387, 1.382, 1.374, 1.364, 1.354, 1.344, 1.334, 1.326,
1.352, 1.358, 1.366, 1.374, 1.379, 1.386, 1.391, 1.393, 1.391, 1.387, 1.379, 1.369, 1.358, 1.347, 1.336, 1.326,
1.356, 1.362, 1.369, 1.377, 1.385, 1.389, 1.393, 1.395, 1.394, 1.388, 1.379, 1.369, 1.358, 1.347, 1.336, 1.326,
1.356, 1.362, 1.369, 1.377, 1.383, 1.388, 1.393, 1.394, 1.393, 1.387, 1.377, 1.367, 1.356, 1.346, 1.334, 1.326,
1.353, 1.359, 1.364, 1.369, 1.377, 1.383, 1.388, 1.389, 1.387, 1.381, 1.371, 1.361, 1.351, 1.341, 1.331, 1.324,
1.349, 1.353, 1.359, 1.363, 1.368, 1.374, 1.379, 1.381, 1.381, 1.371, 1.362, 1.353, 1.344, 1.335, 1.326, 1.319,
1.345, 1.346, 1.349, 1.353, 1.358, 1.364, 1.369, 1.369, 1.368, 1.362, 1.354, 1.344, 1.336, 1.327, 1.319, 1.318,
1.345, 1.345, 1.345, 1.349, 1.353, 1.358, 1.361, 1.361, 1.361, 1.355, 1.347, 1.338, 1.331, 1.322, 1.319, 1.318
]
}
],
"luminance_lut":
[
3.893, 3.682, 3.101, 2.704, 2.357, 2.074, 1.985, 1.977, 1.977, 1.977, 2.041, 2.316, 2.666, 3.057, 3.627, 3.831,
3.682, 3.175, 2.714, 2.418, 2.072, 1.856, 1.712, 1.636, 1.636, 1.689, 1.821, 2.028, 2.376, 2.678, 3.128, 3.627,
3.177, 2.839, 2.421, 2.072, 1.847, 1.579, 1.434, 1.359, 1.359, 1.416, 1.545, 1.801, 2.028, 2.376, 2.797, 3.128,
2.991, 2.621, 2.206, 1.851, 1.579, 1.428, 1.226, 1.151, 1.151, 1.208, 1.395, 1.545, 1.801, 2.151, 2.579, 2.949,
2.915, 2.479, 2.061, 1.709, 1.433, 1.226, 1.146, 1.015, 1.013, 1.127, 1.208, 1.395, 1.661, 2.001, 2.433, 2.876,
2.915, 2.419, 1.989, 1.641, 1.361, 1.151, 1.015, 1.007, 1.001, 1.009, 1.127, 1.325, 1.594, 1.934, 2.371, 2.876,
2.915, 2.419, 1.989, 1.641, 1.361, 1.151, 1.013, 1.004, 1.001, 1.005, 1.127, 1.325, 1.594, 1.934, 2.371, 2.876,
2.922, 2.493, 2.063, 1.709, 1.434, 1.223, 1.146, 1.012, 1.008, 1.127, 1.205, 1.399, 1.666, 2.013, 2.449, 2.884,
3.009, 2.634, 2.209, 1.849, 1.582, 1.434, 1.223, 1.146, 1.146, 1.205, 1.399, 1.556, 1.811, 2.168, 2.601, 2.971,
3.221, 2.867, 2.437, 2.088, 1.849, 1.582, 1.441, 1.365, 1.365, 1.425, 1.556, 1.811, 2.059, 2.403, 2.836, 3.186,
3.755, 3.221, 2.759, 2.437, 2.088, 1.871, 1.726, 1.652, 1.652, 1.711, 1.846, 2.059, 2.403, 2.748, 3.186, 3.723,
3.951, 3.755, 3.157, 2.739, 2.383, 2.099, 2.019, 2.016, 2.016, 2.016, 2.086, 2.353, 2.713, 3.136, 3.723, 3.911
],
"sigma": 0.005,
"sigma_Cb": 0.005
}
},
{
"rpi.contrast":
{
"ce_enable": 1,
"gamma_curve":
[
0, 0, 1024, 5040, 2048, 9338, 3072, 12356, 4096, 15312, 5120, 18051, 6144, 20790, 7168, 23193,
8192, 25744, 9216, 27942, 10240, 30035, 11264, 32005, 12288, 33975, 13312, 35815, 14336, 37600, 15360, 39168,
16384, 40642, 18432, 43379, 20480, 45749, 22528, 47753, 24576, 49621, 26624, 51253, 28672, 52698, 30720, 53796,
32768, 54876, 36864, 57012, 40960, 58656, 45056, 59954, 49152, 61183, 53248, 62355, 57344, 63419, 61440, 64476,
65535, 65535
]
}
},
{
"rpi.ccm":
{
"ccms":
[
{
"ct": 2700, "ccm":
[
1.24141, 0.35437, -0.59578, -0.51309, 1.87147, -0.35838, -0.31548, -1.11436, 2.42984
]
},
{
"ct": 3000, "ccm":
[
1.46878, -0.28074, -0.18804, -0.41877, 1.41722, 0.00154, -0.12837, -0.98072, 2.10909
]
},
{
"ct": 4000, "ccm":
[
1.43532, -0.25531, -0.18002, -0.35574, 1.46911, -0.11336, -0.12509, -0.60778, 1.73287
]
},
{
"ct": 4150, "ccm":
[
1.70003, -0.58839, -0.11165, -0.43727, 1.47037, -0.03311, -0.13077, -0.51345, 1.64422
]
},
{
"ct": 6500, "ccm":
[
1.53197, -0.25773, -0.27423, -0.32591, 1.57394, -0.24803, -0.17084, -0.30841, 1.47925
]
}
]
}
},
{
"rpi.sharpen":
{
"threshold":1.5,
"strength":0.5,
"limit":0.2
}
}
]
}
Thank you very much for your support!
