> For the complete documentation index, see [llms.txt](https://emstone.gitbook.io/guide-jp/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emstone.gitbook.io/guide-jp/cms/no.md).
# 映像の背景
ライブ映像画面でカメラ信号がない、または空のチャンネルのとき、図のようにカメラの背景で表現されます。
背景画像を適用すると、ユーザーが指定した画像に背景を変更できます。
CMS設定 - ビデオ画面でビデオ背景画像の更新ボタンを押して画像を選択します。
初期化したい場合は、初期化ボタンを押して初期化できます。
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# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://emstone.gitbook.io/guide-jp/cms/no.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.