opencv - cvCvtColor中的断言失败(dst.data == dst0.data) [英] opencv - Assertion failed (dst.data == dst0.data) in cvCvtColor
问题描述
以下代码将发布错误消息:
The following code will post the error message:
// object is a color image with type cv::Mat
IplImage* temp_object = &(IplImage)object;
IplImage* ipl_object = cvCreateImage(cvGetSize(temp_object), 8, 3);
assert(temp_object->nChannels == 3 && temp_object->depth == IPL_DEPTH_8U);
assert(ipl_object->nChannels == 3 && ipl_object->depth == IPL_DEPTH_8U);
cvCvtColor(ipl_object, temp_object, CV_BGR2GRAY);
错误
OpenCV错误:cvCvtColor中的断言失败(dst.data == dst0.data),文件/ opt / local /var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/ work / OpenCV-2.3.1 / modules / imgproc / src / color.cpp,第3175行
终止称为抛出异常`
OpenCV Error: Assertion failed (dst.data == dst0.data) in cvCvtColor, file /opt/local /var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_opencv/opencv/work/OpenCV-2.3.1/modules/imgproc/src/color.cpp, line 3175 terminate called throwing an exception`
修改后的更新代码(现在应该可以使用)。感谢您的帮助!
Updated code after modification (it should work now). Thanks for the help!
IplImage temp_object (object);
IplImage* ipl_object = cvCreateImage(cvGetSize(&temp_object), 8, 1);
cvCvtColor(&temp_object, ipl_object, CV_BGR2GRAY);
推荐答案
IplImage* temp_object = &(IplImage)object;
这不会给你一个指向对象的指针
,重新解释为 IplImage
;相反,它从对象
创建一个临时的 IplImage
,给你一个指针,然后销毁临时的,离开 temp_object
指向无效。之后使用 temp_object
会给出未定义的行为。
That doesn't give you a pointer to object
, reinterpreted as IplImage
; instead, it creates a temporary IplImage
from object
, gives you a pointer to that, and then destroys the temporary, leaving temp_object
pointing to nothing valid. Using temp_object
afterwards will give undefined behaviour.
我不熟悉这个库,但也许你想要一个指向对象
的指针(如果 IplImage
是对象的子类型
is):
I'm not familiar with the library, but perhaps you want a pointer to object
(if IplImage
is a subtype of whatever type object
is):
IplImage* temp_object = static_cast<IplImage *>(&object);
使用强制转换转换指针(或引用,如果您愿意),而不是对象本身。
using a cast to convert a pointer (or a reference, if you prefer), not the object itself.
或者你想要一个新的(非临时的)对象:
Or maybe you want a new (non-temporary) object:
IplImage temp_object(object);
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