创建“视觉噪声矩阵”在数学中
为了避免出现刺激后出现“视网膜暂留”，我需要创建一个视觉噪声掩模。
这适用于尺寸为（以像素为单位）的屏幕：1280 * 960
我相信我可以随机（统一）将灰色阴影分配给像素，但我的尝试仍然失败。
感谢您的关注。
In order to avoid "retinal persistence" after the presentation of a stimuli, I need to create a visual noise mask.
This for a screen that has a dimension, in pixel of : 1280 * 960
I believe I could randomly (uniform) assign gray shade to pixels but my attempts yet failed.
Thank you for your attention.
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其他人已经向您展示了创建随机图像的方法。如果您将应用程序设计为使用全屏（或基于当前屏幕的尺寸），您可能会发现不对值进行硬编码而是以编程方式捕获屏幕尺寸很方便。下面的示例展示了如何操作：
Others have already shown you ways of creating a random image. In case you were designing your application to use up the full screen (or based on the current screen's dimensions), you might find it convenient to not hard code the values, but to capture the screen size programmatically. Here's an example showing how:
刚刚注意到：
Mathematica 8 中的新功能，显然......
Just noticed:
New in Mathematica 8, apparently...
该死，终于有一个关于 Stack Overflow 的问题我本可以回答，但我太晚了……:)
哦，好吧，这是一个替代解决方案……
可能颜色太多？
ImageEffect也适用于灰度图像。Damn, at last a question on Stack Overflow I could have answered and I was too late... :)
Oh well, here's an alternative solution...
Probably got too many colours in it?
ImageEffectalso works on greyscale images.您是否尝试查看帮助文档？ Image 的第一个示例应该已经完成了。
您可以指定不同的值范围：
Did you try looking in the help docs? One of the first examples for Image should have done it.
You can specify a different range of values: