blocks|key|1842113|text|尝试使用CImg库。tutorial将帮助您熟悉。一旦有了CImg对象，data()函数将允许您访问2D像素缓冲区数组。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1842114|entityMap|0|LINK|mutability|MUTABLE|url|http://cimg.sourceforge.net/|1|http://cimg.sourceforge.net/reference/group__cimg__tutorial.html|2|http://cimg.sourceforge.net/reference/structcimg__library_1_1CImg.html#1699472936b80a88d3fc8096975d21b2^0|4|4|0|A|8|1|10|6|2|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]]]

Try out the <a href="http://cimg.sourceforge.net/" rel="nofollow noreferrer">CImg</a> library. The <a href="http://cimg.sourceforge.net/reference/group__cimg__tutorial.html" rel="nofollow noreferrer">tutorial</a> will help you get familiarized. Once you have a CImg object, the <a href="http://cimg.sourceforge.net/reference/structcimg__library_1_1CImg.html#1699472936b80a88d3fc8096975d21b2" rel="nofollow noreferrer">data()</a> function will give you access to the 2D pixel buffer array.

blocks|key|1538797|text|您可以通过查看JPEG+format来编写自己的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1538798|也就是说，可以尝试像CImg或Boost's+GIL这样的预先存在的库。或者严格意义上的JPEG，libjpeg。在CodeProject上还有CxImage类。|1538799|这是一个big+list。|1538800|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/JPEG|1|http://cimg.sourceforge.net/|2|http://www.boost.org/doc/libs/1_41_0/libs/gil/doc/index.html|3|http://en.wikipedia.org/wiki/Libjpeg|4|http://www.codeproject.com/KB/graphics/cximage.aspx|5|http://www.mathtools.net/C_C__/Image_Processing/^0|7|B|0|0|A|4|1|F|B|2|1D|7|3|20|7|4|0|4|8|5|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]|$A|1A|B|1B|1|1C]|$A|1D|B|1E|1|1F]]|C|$]]|$1|F|3|G|5|6|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|H|3|-4|5|6|7|1K|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]|V|$5|K|L|M|C|$N|W]]|X|$5|K|L|M|C|$N|Y]]]]

You could write your own by looking at the <a href="http://en.wikipedia.org/wiki/JPEG" rel="noreferrer">JPEG format</a>.

That said, try a pre-existing library like <a href="http://cimg.sourceforge.net/" rel="noreferrer">CImg</a>, or <a href="http://www.boost.org/doc/libs/1_41_0/libs/gil/doc/index.html" rel="noreferrer">Boost's GIL</a>. Or for strictly JPEG's, <a href="http://en.wikipedia.org/wiki/Libjpeg" rel="noreferrer">libjpeg</a>. There is also the <a href="http://www.codeproject.com/KB/graphics/cximage.aspx" rel="noreferrer">CxImage</a> class on CodeProject.

Here's a <a href="http://www.mathtools.net/C_C__/Image_Processing/" rel="noreferrer">big list</a>.

blocks|key|5369655|text|查看ImageMagick的Magick%2B%2B+API。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5369656|entityMap|0|LINK|mutability|MUTABLE|url|http://www.imagemagick.org/script/index.php|1|http://www.imagemagick.org/Magick%2B%2B/^0|2|B|0|E|C|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Check out the <a href="http://www.imagemagick.org/Magick++/" rel="nofollow noreferrer">Magick++ API</a> to <a href="http://www.imagemagick.org/script/index.php" rel="nofollow noreferrer">ImageMagick</a>.

blocks|key|5369689|text|corona很不错。来自本教程：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5369690|corona::Image*+image+=+corona::OpenImage("img.jpg",+corona::PF_R8G8B8A8);
if+(!image)+{
++//+error!
}

int+width++=+image->getWidth();
int+height+=+image->getHeight();
void*+pixels+=+image->getPixels();

//+we're+guaranteed+that+the+first+eight+bits+of+every+pixel+is+red,
//+the+next+eight+bits+is+green,+and+so+on...
typedef+unsigned+char+byte;
byte*+p+=+(byte*)pixels;
for+(int+i+=+0;+i+<+width+*+height;+%2B%2Bi)+{
++byte+red+++=+*p%2B%2B;
++byte+green+=+*p%2B%2B;
++byte+blue++=+*p%2B%2B;
++byte+alpha+=+*p%2B%2B;
}|code-block|syntax|javascript|5369691|像素将是一维数组，但您可以很容易地将给定的x和y位置转换为一维数组中的位置。类似pos+=+(y+*+width)+%2Bx的值|5369692|entityMap|0|LINK|mutability|MUTABLE|url|http://corona.sourceforge.net/^0|0|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

<a href="http://corona.sourceforge.net/" rel="nofollow noreferrer">corona</a> is nice. From the tutorial:

<pre><code>corona::Image* image = corona::OpenImage("img.jpg", corona::PF_R8G8B8A8);
if (!image) {
 // error!
}

int width = image-&gt;getWidth();
int height = image-&gt;getHeight();
void* pixels = image-&gt;getPixels();

// we're guaranteed that the first eight bits of every pixel is red,
// the next eight bits is green, and so on...
typedef unsigned char byte;
byte* p = (byte*)pixels;
for (int i = 0; i &lt; width * height; ++i) {
 byte red = *p++;
 byte green = *p++;
 byte blue = *p++;
 byte alpha = *p++;
}
</code></pre>

pixels would be a one dimensional array, but you could easily convert a given x and y position to a position in a 1D array. Something like pos = (y * width) + x

blocks|key|3951991|text|查看英特尔开放式CV库+...|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3951992|entityMap^0|2|9|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Check out Intel Open CV library ...

blocks|key|1542855|text|查看此线程：read+and+write+image+file。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1542856|另外，请看一下this+other+question+at+Stackoverflow。|1542857|entityMap|0|LINK|mutability|MUTABLE|url|http://www.dreamincode.net/forums/showtopic29852.htm|1|https://stackoverflow.com/questions/1533542/opencv-cant-read-image^0|6|P|0|0|7|10|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Check this thread out: <a href="http://www.dreamincode.net/forums/showtopic29852.htm" rel="nofollow noreferrer">read and write image file</a>.

Also, have a look at <a href="https://stackoverflow.com/questions/1533542/opencv-cant-read-image">this other question at Stackoverflow</a>.

blocks|key|5369762|text|如果你决定使用最小的方法，没有libpng/libjpeg依赖，我建议使用stb_image和stb_image_write，找到here。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5369763|这很简单，你只需要把头文件stb_image.h和stb_image_write.h放在你的文件夹里。|5369764|下面是读取图片所需的代码：|5369765|#include+<stdint.h>

#define+STB_IMAGE_IMPLEMENTATION
#include+"stb_image.h"

int+main()+{
++++int+width,+height,+bpp;

++++uint8_t*+rgb_image+=+stbi_load("image.png",+&width,+&height,+&bpp,+3);

++++stbi_image_free(rgb_image);

++++return+0;
}|code-block|syntax|javascript|5369766|下面是编写图像的代码：|5369767|#include+<stdint.h>

#define+STB_IMAGE_WRITE_IMPLEMENTATION
#include+"stb_image_write.h"

#define+CHANNEL_NUM+3

int+main()+{
++++int+width+=+800;+
++++int+height+=+800;

++++uint8_t*+rgb_image;
++++rgb_image+=+malloc(width*height*CHANNEL_NUM);

++++//+Write+your+code+to+populate+rgb_image+here

++++stbi_write_png("image.png",+width,+height,+CHANNEL_NUM,+rgb_image,+width*CHANNEL_NUM);

++++return+0;
}|5369768|您可以在没有标志或依赖项的情况下进行编译：|5369769|g%2B%2B+main.cpp|5369770|其他轻量级替代方案包括：|5369771|读写png的|5369772|lodepng读写jpeg文件的files|unordered-list-item|5369773|jpeg-compressor+|5369774|5369775|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nothings/stb|1|https://github.com/lvandeve/lodepng|2|https://code.google.com/archive/p/jpeg-compressor/^0|11|9|1B|F|1T|4|0|0|D|B|P|H|0|0|0|0|0|0|0|0|0|0|7|1|0|0|F|2|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|F|3|G|5|6|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1V|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1W|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1X|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1Y|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|U|3|V|5|L|7|20|8|@]|D|@]|E|$M|N]]|$1|W|3|X|5|6|7|21|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|22|8|@]|D|@]|E|$]]|$1|10|3|11|5|12|7|23|8|@]|D|@$9|24|A|25|1|26]]|E|$]]|$1|13|3|14|5|12|7|27|8|@]|D|@$9|28|A|29|1|2A]]|E|$]]|$1|15|3|-4|5|6|7|2B|8|@]|D|@]|E|$]]|$1|16|3|-4|5|6|7|2C|8|@]|D|@]|E|$]]]|17|$18|$5|19|1A|1B|E|$1C|1D]]|1E|$5|19|1A|1B|E|$1C|1F]]|1G|$5|19|1A|1B|E|$1C|1H]]]]

If you decide to go for a minimal approach, without libpng/libjpeg dependencies, I suggest using <code>stb_image</code> and <code>stb_image_write</code>, found <a href="https://github.com/nothings/stb" rel="noreferrer">here</a>.

It's as simple as it gets, you just need to place the header files <code>stb_image.h</code> and <code>stb_image_write.h</code> in your folder. 

Here's the code that you need to read images:

<pre><code>#include &lt;stdint.h&gt;

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

int main() {
 int width, height, bpp;

 uint8_t* rgb_image = stbi_load("image.png", &amp;width, &amp;height, &amp;bpp, 3);

 stbi_image_free(rgb_image);

 return 0;
}
</code></pre>

And here's the code to write an image:

<pre><code>#include &lt;stdint.h&gt;

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

#define CHANNEL_NUM 3

int main() {
 int width = 800; 
 int height = 800;

 uint8_t* rgb_image;
 rgb_image = malloc(width*height*CHANNEL_NUM);

 // Write your code to populate rgb_image here

 stbi_write_png("image.png", width, height, CHANNEL_NUM, rgb_image, width*CHANNEL_NUM);

 return 0;
}
</code></pre>

You can compile without flags or dependencies:

<pre><code>g++ main.cpp
</code></pre>

Other lightweight alternatives include:

<ul>
<li><a href="https://github.com/lvandeve/lodepng" rel="noreferrer">lodepng</a> to read and write png files</li>
<li><a href="https://code.google.com/archive/p/jpeg-compressor/" rel="noreferrer">jpeg-compressor</a> to read and write jpeg files</li>
</ul>

I need to read an image file in C/C++. It would be very great, if some one can post the code for me.

I work on gray scale images and the images are JPEG. I would like to read the images into a 2D array which will make my work easy.

Reading an image file in C/C++

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我需要在C/C++中读取图像文件。这将是非常伟大的，如果有人可以为我张贴的代码。我在灰度图像上工作，图像是JPEG格式。我想将图像读入一个2D数组，这将使我的工作变得容易。

问在C/C++中读取图像文件
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在C/C++中读取图像文件EN