Love tree aesthetic imagery PPT background picture, green PPT background picture, fresh and elegant background picture, love theme background images, HD no watermark, pixel: 1280x800.

爱心树唯美意象ppt背景图片，绿色ppt背景图片，清新淡雅的背景图片，爱主题背景图片，高清无水印，像素：1280x800。

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The grass fresh and elegant PPT background image, background picture PPT green, green background picture, lush green grass PPT background image, background images, no watermark, pixel: 1024x640.

绿草清新淡雅ppt背景图片，绿色背景图片，绿色ppt背景图片，绿草如茵背景图片，绿草ppt背景图片，无水印，像素：1024x640。

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Test results show that embedding around video quality has not changed significantly, in the absence of attack detection of the watermark and the original watermark than no obvious changes.

试验结果表明，水印嵌入前后，视频质量没有显明的变化，在无攻击时检测到的水印信息和原水印信息比拟也没有显明的变化。

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