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C 中剪切 jpg 文件, (NOT 作物)
原标题:Cut a jpg file in C, (NOT crop)

我想知道我如何使用坐标切开jpg文件 来使用 artoolkit 和 opencv 检索 。 见 :

Blob 探测

i want to retrieve coordinates of the white sheet and then use those coordinates to cut a jpg file I m took before. Find this but how can this help? How to slice/cut an image into pieces

最佳回答

如果您已经有坐标, 您可能想要先 < a href=" https:// stackoverflow. com/ questions/7809005/ ffine- transform- sform- simple- routation- and- scaling- or- something- else- entirely" > 将图像先 格式化 :

< a href=" "http://nuigroup.com/? ACT=28&fid=27&aid=1892_H6eNAaign4Mrenn30Au8d" rel= "no follown noreferrer" >http://nuigroup.com/?ACT=28&fid=27&aid=1892_H6NAaign4Mren30Au8d

< a href=" "https://stackoverflow.com/ questions/783487/ effect-cvwarpperspersperpect-for-a-fake-deskewing-on-a-set-o-set-of-cvpoint" > 这篇文章 使用了 cv:: warpPersperpect () 来达到这一效果。

以上引用使用 OpenCV 的 < strong> > C/strong > 界面, 但我确定您有能力在两者之间转换 。

其次,图像的某个特定区域被称为提取一个利益区域(ROI)。一般程序是:创建 < code> CvRect 来定义您的 ROI,然后调用 cvSetSetimageROI () ,然后是 cvSaveImaage () ,将其保存在磁盘上。

"https://stackoverflow.com/a/10326191/176769" >此文章 分享 C 代码来完成这项任务。

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