随机访问图像（图片）文件 [英] Random access image (picture) file

问题描述

是否存在允许随机访问其部分的文件格式（图像文件）。
例如，我有一个分辨率为100000x100000像素的巨大图像文件，我只想阅读一小部分。就像具有缩放级别的geomap一样。

Is there a file format (image file) that allows random access to its sections. For example, I have huge image file with resolution of 100000x100000 pixels and I want to read just one small section. Like a geomap with zoom levels.

我想用Java编写一些应用程序。我可以使用数百个小文件并以某种方式将它们组合起来，但是如果有一种方法可以用一个巨大的文件（或者很少的文件）来做它会好得多。

I want to write some app in Java. I could use hundreds of small files and combine them somehow, but it would be much better if there is a way to do it with one huge file (or few of them).

推荐答案

纹理压缩

看看纹理压缩格式，它们都是两者兼而有之压缩并允许随机访问，以减少用于3D渲染的GPU纹理上的图像使用带宽 https：// en。 wikipedia.org/wiki/Texture_compression ：

Have a look at texture compression formats, which are designed to be both compressed and allow random access, to reduce bandwidth of image usage on GPU textures for 3D rendering https://en.wikipedia.org/wiki/Texture_compression :

与传统的图像压缩算法不同，纹理压缩算法针对随机访问进行了优化。 / p>

Unlike conventional image compression algorithms, texture compression algorithms are optimized for random access.

以下格式似乎已打开：

• https://www.khronos.org/opengles/sdk/tools/KTX / https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/


• https://en.wikipedia.org/wiki/Ericsson_Texture_Compression

• https://www.khronos.org/opengles/sdk/tools/KTX/ https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/
• https://en.wikipedia.org/wiki/Ericsson_Texture_Compression

ARM Mali AFBC是一个（专有？）示例 https://www.arm.com/products/graphics-and-multimedia/mali-technologies

ARM Mali AFBC is one (proprietary?) example https://www.arm.com/products/graphics-and-multimedia/mali-technologies

随机访问低至4x4块级别

Random access down to 4x4 block level

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