1、結(jié)構(gòu)體數(shù)組的優(yōu)點

? ? ?結(jié)構(gòu)體可以存儲不同的數(shù)據(jù)類型，將他們互相聯(lián)系起來。結(jié)構(gòu)體數(shù)組可以連續(xù)存儲多個結(jié)構(gòu)體，和數(shù)組作用相似。比如想定義同一個最小外接矩形的四個坐標值，并給予這個矩形一個特征編號。當需要存儲多個最小外接矩形的信息時，就需要動態(tài)申請一個結(jié)構(gòu)體數(shù)組。

2、結(jié)構(gòu)體數(shù)組的定義和使用

? ? ?以某一個需求為例，給出了結(jié)構(gòu)體數(shù)組的定義、初始化、用戶交互使用、釋放。

struct rect //待檢測區(qū)域的結(jié)構(gòu)體 {int min_x; //左上坐標int min_y;int max_x; //右下坐標int max_y;char feature; //特征編號：A 泡棉 B 標簽 C Logo }; struct rect *area = (rect*)malloc(sizeof(rect) * area_num); //動態(tài)申請area_num個結(jié)構(gòu)體數(shù)組,存儲待檢測區(qū)域信息if (area == NULL){printf("Fail to allocate memory to area\n");//cout << "Fail to allocate memory to rect1" << endl;exit(1);}for (int k = 0; k < area_num; k++)//初始化{area[k].min_x = 0;area[k].max_x = 0;area[k].min_y = 0;area[k].max_y = 0;area[k].feature = 0;}printf("請依次輸入待檢測區(qū)域坐標和待檢測的特征\n");printf("坐標為左上坐標和右下坐標，特征編號為：A 泡棉 B 標簽 C logo 各個數(shù)據(jù)空格隔開輸入\n");for (int i = 0; i < area_num; i++){scanf("%d %d %d %d %c", &area[i].min_x, &area[i].min_y, &area[i].max_x, &area[i].max_y, &area[i].feature);} for (int i = 0; i < area_num; i++)//循環(huán)截取判斷{int rect_width = area[i].max_x - area[i].min_x + 1;int rect_height = area[i].max_y - area[i].min_y + 1;unsigned char *mindst = (unsigned char*)malloc(rect_width* rect_height* sizeof(unsigned char));unsigned char *minsrc = (unsigned char*)malloc(rect_width* rect_height* sizeof(unsigned char));cutout(gray2, minsrc, widths, heights, &area[i] );//基準圖截取cutout(dst, mindst, widths, heights, &area[i] );//結(jié)果圖截取printf("區(qū)域序號：%d ：",i);switch (area[i].feature){case 'A': //泡棉檢測{float result_jz01;float result_jz02;result_jz01 = calGLCM(minsrc, GLCM_ANGLE_VERTICAL, rect_width, rect_height);result_jz02 = calGLCM(mindst, GLCM_ANGLE_VERTICAL, rect_width, rect_height);printf("一致性差值 = %f\n", abs(result_jz01 - result_jz02));if (abs(result_jz01 - result_jz02) > 600) //閾值可調(diào)節(jié)printf("貼泡棉\n");elseprintf("未貼泡棉\n");break;};case 'B': //標簽檢測{float result_ssim;result_ssim = SSIM(minsrc, mindst, rect_width, rect_height);printf("相似性 = %f\n", abs(result_ssim));if (result_ssim > 0.4) //閾值可調(diào)節(jié)printf("貼標簽\n");elseprintf("未貼標簽\n");break;};case 'C': //logo檢測{float result_ssim;result_ssim = SSIM(minsrc, mindst, rect_width, rect_height);printf("相似性 = %f\n", abs(result_ssim));if (result_ssim > 0.4) //閾值可調(diào)節(jié)printf("LOGO正確\n");elseprintf("LOGO不正確\n");break;};default: printf("未輸入特征類型！");}free(mindst);free(minsrc);} free(area);//一定要釋放

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