struct CorrectionData { int num_row; //图像总行数 int first_row; //校正起始行 int end_row; //校正结束行 float *offsets_z; //校正数据 };

This is a struct definition in C++ programming language. It defines a structure named CorrectionData which has the following members:
- an integer variable named num_row representing the total number of rows in an image
- an integer variable named first_row representing the starting row for correction
- an integer variable named end_row representing the ending row for correction
- a pointer to a float variable named offsets_z which points to an array of correction data for each row.

This struct could be used to store and pass correction data for an image processing algorithm that needs to adjust the Z-axis offsets for each row in the image.