想问下这个预置是什么意思

绿野-花漾

#define ROW 35   //35行
#define COLUMN  150    //150列
#define MIDDLE  75      //中间是75
signed int basic_flag=0;
unsigned char Image_Data[ROW][COLUMN];
unsigned char VSYN_C=0, Line_Flag, m = 0;
unsigned int Line_C=0;
unsigned char Interval;
unsigned char yuzhi=0x55; //40  45 47
unsigned int center_line[ROW];
unsigned int you_edge=0,right_edge=0;
unsigned int zuo_edge=0,left_edge=0;
unsigned int hei_count1=0,hei_count2=0;//黑点数
unsigned int down_limit=0,up_limit=0;

程序中unsigned char yuzhi=0x55; //40  45 47 预置是什么意思 看不懂

戥家三少

xiaobai727

正确的写法是：阈值