Here's quite a nice introduction tutorial in Image Processing with Java. It has theory, which is transferable to Android (and other platforms). Once you know some of the theory, this tutorial explains how to manipulate images and pixels on Android.
There are some existing libraries which you can use as well such as a JavaCV. This will abstract away some of the lower level details.
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这里是一个相当不错的 Image 入门教程用Java 处理。它有理论，可以转移到 Android（和其他平台）。
一旦您了解了一些理论，本教程解释了如何在 Android 上操作图像和像素。
您也可以使用一些现有的库，例如 JavaCV。这将抽象出一些较低级别的细节。
Here's quite a nice introduction tutorial in Image Processing with Java. It has theory, which is transferable to Android (and other platforms).
Once you know some of the theory, this tutorial explains how to manipulate images and pixels on Android.
There are some existing libraries which you can use as well such as a JavaCV. This will abstract away some of the lower level details.