【作業メモ】ラズパイのHQカメラの設定を確認する

VNC経由でCマウントレンズのフォーカスをあわせるのは、タイムラグの関係で至難の業かも。スマホ経由で接続することを想定すると、画面の大きさもあいまって、やっぱり難しいと思う。あるいは液晶ディスプレイをつけるか？

フォーカスはドラレコみたいに無限遠で固定したほうがいいかも。ということでM12の16mmレンズをおもちゃ箱からひっぱりだしてきた（20~25mmがほしい）。Cマウントアダプターを噛ませて装着した姿がこちら。いずれグルーガンか何かで固定したい。アストロイドも焦点固定のように見えるけれど、そういうことかしら？

撮影はターミナルで。 libcamera-still コマンドを使う。libcamera-jpgとの違いがよくわからないけれど、たぶん使えるパラメータが多いので、libcamera-stillでいいんじゃないだろうか。

シャッタースピードは速いほうがよいと思う（Solveに時間がかかるしね）。シャッタースピードのプションは–shutter。シャッタースピードはマイクロ秒。1にゼロが3個で1秒。数えるのしんどい。

夜空を撮るにあたってgainは大事だよね。下限は0として上限は不明。GAINの値を100以上にすると写りに変化がない印象。1~100で適正値をさぐるべし。

そんなこったで実際の夜空を撮ってみる必要はあるけれど、雨空を撮ってみた感じ、星撮りの設定はこのあたりかなぁ。ちょっと明るい気がする。

libcamera-still -o ~/skysolve/test.jpg –shutter 10000000 –gain 5

libcamera-still のオプションは次のとおり。目がチカチカするね。以上。
-h [ –help ] [=arg(=1)] (=0) Print this help message
–version [=arg(=1)] (=0) Displays the build version number
–list-cameras [=arg(=1)] (=0) Lists the available cameras attached to the system.
–camera arg (=0) Chooses the camera to use. To list the available indexes, use the
–list-cameras option.
-v [ –verbose ] [=arg(=2)] (=1) Set verbosity level. Level 0 is no output, 1 is default, 2 is verbose.
-c [ –config ] [=arg(=config.txt)] Read the options from a file. If no filename is specified, default to
config.txt. In case of duplicate options, the ones provided on the command line
will be used. Note that the config file must only contain the long form
options.
–info-text arg (=#%frame (%fps fps) exp %exp ag %ag dg %dg)
Sets the information string on the titlebar. Available values:
%frame (frame number)
%fps (framerate)
%exp (shutter speed)
%ag (analogue gain)
%dg (digital gain)
%rg (red colour gain)
%bg (blue colour gain)
%focus (focus FoM value)
%aelock (AE locked status)
%lp (lens position, if known)
%afstate (AF state, if supported)
–width arg (=0) Set the output image width (0 = use default value)
–height arg (=0) Set the output image height (0 = use default value)
-t [ –timeout ] arg (=5000) Time (in ms) for which program runs
-o [ –output ] arg Set the output file name
–post-process-file arg Set the file name for configuring the post-processing
–rawfull [=arg(=1)] (=0) Force use of full resolution raw frames
-n [ –nopreview ] [=arg(=1)] (=0) Do not show a preview window
-p [ –preview ] arg (=0,0,0,0) Set the preview window dimensions, given as x,y,width,height e.g. 0,0,640,480
-f [ –fullscreen ] [=arg(=1)] (=0) Use a fullscreen preview window
–qt-preview [=arg(=1)] (=0) Use Qt-based preview window (WARNING: causes heavy CPU load, fullscreen not
supported)
–hflip [=arg(=1)] (=0) Request a horizontal flip transform
–vflip [=arg(=1)] (=0) Request a vertical flip transform
–rotation arg (=0) Request an image rotation, 0 or 180
–roi arg (=0,0,0,0) Set region of interest (digital zoom) e.g. 0.25,0.25,0.5,0.5
–shutter arg (=0) Set a fixed shutter speed in microseconds
–analoggain arg (=0) Set a fixed gain value (synonym for ‘gain’ option)
–gain arg Set a fixed gain value
–metering arg (=centre) Set the metering mode (centre, spot, average, custom)
–exposure arg (=normal) Set the exposure mode (normal, sport)
–ev arg (=0) Set the EV exposure compensation, where 0 = no change
–awb arg (=auto) Set the AWB mode (auto, incandescent, tungsten, fluorescent, indoor, daylight,
cloudy, custom)
–awbgains arg (=0,0) Set explict red and blue gains (disable the automatic AWB algorithm)
–flush [=arg(=1)] (=0) Flush output data as soon as possible
–wrap arg (=0) When writing multiple output files, reset the counter when it reaches this
number
–brightness arg (=0) Adjust the brightness of the output images, in the range -1.0 to 1.0
–contrast arg (=1) Adjust the contrast of the output image, where 1.0 = normal contrast
–saturation arg (=1) Adjust the colour saturation of the output, where 1.0 = normal and 0.0 =
greyscale
–sharpness arg (=1) Adjust the sharpness of the output image, where 1.0 = normal sharpening
–framerate arg (=-1) Set the fixed framerate for preview and video modes
–denoise arg (=auto) Sets the Denoise operating mode: auto, off, cdn_off, cdn_fast, cdn_hq
–viewfinder-width arg (=0) Width of viewfinder frames from the camera (distinct from the preview window
size
–viewfinder-height arg (=0) Height of viewfinder frames from the camera (distinct from the preview window
size)
–tuning-file arg (=-) Name of camera tuning file to use, omit this option for libcamera default
behaviour
–lores-width arg (=0) Width of low resolution frames (use 0 to omit low resolution stream
–lores-height arg (=0) Height of low resolution frames (use 0 to omit low resolution stream
–mode arg Camera mode as W:H:bit-depth:packing, where packing is P (packed) or U
(unpacked)
–viewfinder-mode arg Camera mode for preview as W:H:bit-depth:packing, where packing is P (packed)
or U (unpacked)
–buffer-count arg (=0) Number of in-flight requests (and buffers) configured for video, raw, and
still.
–viewfinder-buffer-count arg (=0) Number of in-flight requests (and buffers) configured for preview window.
–autofocus-mode arg (=default) Control to set the mode of the AF (autofocus) algorithm.(manual, auto,
continuous)
–autofocus-range arg (=normal) Set the range of focus distances that is scanned.(normal, macro, full)
–autofocus-speed arg (=normal) Control that determines whether the AF algorithm is to move the lens as quickly
as possible or more steadily.(normal, fast)
–autofocus-window arg (=0,0,0,0) Sets AfMetering to AfMeteringWindows an set region used, e.g.
0.25,0.25,0.5,0.5
–lens-position arg Set the lens to a particular focus position, expressed as a reciprocal distance
(0 moves the lens to infinity), or “default” for the hyperfocal distance
–hdr [=arg(=1)] (=0) Enable (1) or disable (0) High Dynamic Range, where supported
–metadata arg Save captured image metadata to a file or “-” for stdout
–metadata-format arg (=json) Format to save the metadata in, either txt or json (requires –metadata)
-q [ –quality ] arg (=93) Set the JPEG quality parameter
-x [ –exif ] arg Add these extra EXIF tags to the output file
–timelapse arg (=0) Time interval (in ms) between timelapse captures
–framestart arg (=0) Initial frame counter value for timelapse captures
–datetime [=arg(=1)] (=0) Use date format for output file names
–timestamp [=arg(=1)] (=0) Use system timestamps for output file names
–restart arg (=0) Set JPEG restart interval
-k [ –keypress ] [=arg(=1)] (=0) Perform capture when ENTER pressed
-s [ –signal ] [=arg(=1)] (=0) Perform capture when signal received
–thumb arg (=320:240:70) Set thumbnail parameters as width:height:quality, or none
-e [ –encoding ] arg (=jpg) Set the desired output encoding, either jpg, png, rgb, bmp or yuv420
-r [ –raw ] [=arg(=1)] (=0) Also save raw file in DNG format
–latest arg Create a symbolic link with this name to most recent saved file
–immediate [=arg(=1)] (=0) Perform first capture immediately, with no preview phase
–autofocus-on-capture [=arg(=1)] (=0)
Switch to AfModeAuto and trigger a scan just before capturing a still