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docs: Add manual exposure parameters (en/ru)

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Alexey Rogachevskiy
2019-10-07 16:46:48 +03:00
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docs/en/camera.md
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If it doesn't work, check the camera cable connections and the cable itself. Replace the cable if it is damaged. Also, make sure the camera screws don't touch any components on the camera board.
## Camera parameters
Some camera parameters, such as image size, FPS cap, and exposure, may be configured in the `main_camera.launch` file. The list of supported parameters can be found [in the cv_camera repository](https://github.com/OTL/cv_camera#parameters).
Additionally you can specify an arbitrary capture parameter using its [OpenCV code](https://docs.opencv.org/3.3.1/d4/d15/group__videoio__flags__base.html). For example, add the following parameters to the camera node to set exposition manually:
```xml
<param name="property_0_code" value="21"/> <!-- property code 21 is CAP_PROP_AUTO_EXPOSURE -->
<param name="property_0_value" value="0.25"/> <!-- property values are normalized as per OpenCV specs, even for "menu" controls; 0.25 means "use manual exposure" -->
<param name="cv_cap_prop_exposure" value="0.3"> <!-- set exposure to 30% of maximum value -->
```
## Computer vision
The [SD card image](image.md) comes with a preinstalled [OpenCV](https://opencv.org) library, which is commonly used for various comupter vision-related tasks. Additional libraries for converting from ROS messages to OpenCV images and back are preinstalled as well.

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docs/ru/camera.md
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Если команда завершается с ошибкой, проверьте качество подключения шлейфа камеры к Raspberry Pi или замените его.
## Настройки камеры
Ряд параметров камеры - размер изображения, максимальную частоту кадров, экспозицию - можно настроить в файле `main_camera.launch`. Список настраиваемых параметров можно [посмотреть в репозитории cv_camera](https://github.com/OTL/cv_camera#parameters).
Параметры, не указанные в этом списке, можно указывать через [код параметра OpenCV](https://docs.opencv.org/3.3.1/d4/d15/group__videoio__flags__base.html). Например, для установки фиксированной экспозиции добавьте следующие параметры в ноду камеры:
```xml
<param name="property_0_code" value="21"/> <!-- property code 21 is CAP_PROP_AUTO_EXPOSURE -->
<param name="property_0_value" value="0.25"/> <!-- property values are normalized as per OpenCV specs, even for "menu" controls; 0.25 means "use manual exposure" -->
<param name="cv_cap_prop_exposure" value="0.3"> <!-- set exposure to 30% of maximum value -->
```
## Компьютерное зрение
Для реализации алгоритмов компьютерного зрения рекомендуется использовать предустановленную на [образ SD-карты](image.md) библиотеку [OpenCV](https://opencv.org).