如何在java中剪切四分之一的图像 [英] How to cut an image in quarters in java

问题描述

我正在尝试将我上传到java编写程序中的图像剪切成四分之一，特别是金字塔。每个金字塔等级都有一个相应的图像，例如给定abc.pgm的输入图像，您将为金字塔等级1生成输出图像abc1.pgm，为金字塔等级2生成abc2.pgm。每个级别应该是前一级别的四分之一大小。但我真的不明白怎么做...任何信息都会非常感激！

I am trying to cut an image that I have uploaded into a java written program into quarters, specifically a pyramid. Every pyramid level will have a corresponding image, for example given an input image of abc.pgm, you will generate output images abc1.pgm for pyramid level 1, and abc2.pgm for pyramid level2. Each level should be in a quarter size from the previous level. But I really don't understand how to do this... any information would be greatly appreciated!

推荐答案

请查看我对该问题的最后评论，从当然，我理解。请求很模糊（你使用的图形框架/ API是什么？），但你需要的是：

http://en.wikipedia.org/wiki/Recursion [ ^ ]，

http://en.wikipedia.org/ wiki / Recursion_％28computer_science％29 [ ^ ]。



有趣的是，这种结构经常（但并非总是）导致分形，具有非整数的几何对象（或在所谓的非均匀分形的情况下，甚至不存在 Hausdorff维数。这些物体甚至可以模拟现实生活中发现的许多现有物体，这些物体表现出非常奇特的物理特性，特别是在光学和固态物理学中。



请参阅：

http：/ /en.wikipedia.org/wiki/Fractal [ ^ ]，

http://en.wikipedia.org/wiki/Hausdorff_dimension [< a href =http://en.wikipedia.org/wiki/Hausdorff_dimensiontarget =_ blanktitle =New Window> ^ ]，

http://en.wikipedia.org/wiki/Fractal_dimension [ ^ ]。



当你有机会时这是真的一个案例（并且应该使用它，如果你是一个好学生）超越你的狭隘（专业），即使它像软件那么广泛，并获得一些基本的背景，特别是在数学和物理学。使用此更改！

-SA

Please see my last comment to the question, starting with "Sure, I understand that". The request is vague enough (what graphics framework/API are you using?), but what you need is this:
http://en.wikipedia.org/wiki/Recursion[^],
http://en.wikipedia.org/wiki/Recursion_%28computer_science%29[^].

Interestingly, such constructions often (but not always), lead to fractals, geometric objects with non-integer (or even non-existing, in case of so called non-uniform fractals) Hausdorff dimension. Such objects can even model many existing object found in real life, which manifest really exotic physical properties, especially in optics and solid-state physics.

Please see:
http://en.wikipedia.org/wiki/Fractal[^],
http://en.wikipedia.org/wiki/Hausdorff_dimension[^],
http://en.wikipedia.org/wiki/Fractal_dimension[^].

This is really a case when you get a chance (and should use it, if you are a good student) to go beyond your narrow ("profession"), even if it so broad as "software" and get some fundamental background, in particular, in mathematics and physics. Use this change!

—SA

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