CvMemStorage 内存储存器

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CvMemStorage 内存储存器，双向链表，OpenCV以此统一管理动态内存。

/* Creates new memory storage.
block_size == 0 means that default,
somewhat optimal size, is used (currently, it is 64K) */
CVAPI(CvMemStorage*) cvCreateMemStorage( int block_size CV_DEFAULT(0));创建一个内存储存器，block_size对应内存存储器每个内存块的大小。默认为0，默认大小为64k。

/* Releases memory storage. All the children of a parent must be released before
the parent. A child storage returns all the blocks to parent when it is released */
CVAPI(void) cvReleaseMemStorage( CvMemStorage** storage );释放内存储存器的所有内存空间。

/* Clears memory storage. This is the only way(!!!) (besides cvRestoreMemStoragePos)
   to reuse memory allocated for the storage - cvClearSeq,cvClearSet ...
   do not free any memory.
   A child storage returns all the blocks to the parent when it is cleared */

CVAPI(void) cvClearMemStorage( CvMemStorage* storage );清空内存存储器。它与cvReleaseMemStorage的区别在于，它仅将释放的内存返还给内存存储器，并不返还给

系统。可方便重复使用内存存储器中的内存空间。