STM32F103ZET6+OV7670S实现简易的运动识别，但显示有问题【求助】

Ken042 · 发表于 2020-4-20 22:14:10

STM32F103ZET6+OV7670实现简易的运动识别，但显示有问题。
具体问题描述：使用的硬件是STM32F1精英版和配套的OV7670摄像头，代码基础是板子给的程序源码，加了图像二值化的代码。想通过计算两帧二值化图像里的值为0的像素点个数（ab1和ab2）之差，与设定的阈值做对比，大于阈值则说明有物体运动。但实际显示是只要屏幕上值为0的像素点数量大于阈值，就直接出提示”someone is here”，表示检测到运动了。就好像ab2的值一直为0一样。想看看ab1和ab2的值，显示的数值也是怪怪的，不知道是逻辑问题还是代码本身不能这么写，求大佬指点

。程序和截图如下：#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "lcd.h"
#include "usart.h"
#include "string.h"
#include "ov7670.h"
#include "tpad.h"
#include "timer.h"
#include "exti.h"
#include "usmart.h"
#include "stdio.h"

extern u8 ov_sta;
extern u8 ov_frame;
u32 ab1=0;
u32 ab2=0;
u32 ab3=0;
char tmp1[10];
char tmp2[10];
void camera_refresh(void)
{
      u32 j;
      u16 color;
      if(ov_sta)
      {
            LCD_Scan_Dir(U2D_L2R);
            if(lcddev.id==0X1963)LCD_Set_Window((lcddev.width-240)/2,(lcddev.height-320)/2,240,320);
            else if(lcddev.id==0X5510||lcddev.id==0X5310)LCD_Set_Window((lcddev.width-320)/2,(lcddev.height-240)/2,320,240);
            LCD_WriteRAM_Prepare();
            OV7670_RRST=0;
            OV7670_RCK_L;
            OV7670_RCK_H;
            OV7670_RCK_L;
            OV7670_RRST=1;
            OV7670_RCK_H;

            for(j=0;j<76800;j++)
            {
            OV7670_RCK_L;
            color=GPIOC->IDR&0XFF;
            OV7670_RCK_H;
            color<<=8;
            OV7670_RCK_L;
            color|=GPIOC->IDR&0XFF;
            OV7670_RCK_H;
               if(color > 0x6000)
                  {
                     color = 0xffff;
                  }
               else
                  {
                     color = 0x0000;
                     ab1++;
                  }
                     LCD->LCD_RAM=color;
}

            ov_sta=0;
            ov_frame++;
            LCD_Scan_Dir(DFT_SCAN_DIR);
      }
}

int main(void)
{
      u8 key;
      u8 lightmode=0,saturation=2,contrast=2;
      u8 effect=0;
      u8 i=0;

      delay_init();
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      uart_init(115200);
      usmart_dev.init(72);
      LED_Init();
      KEY_Init();
      LCD_Init();
      TPAD_Init(6);
      POINT_COLOR=RED;
      LCD_ShowString(30,70,200,16,16,"OV7670 TEST");
      LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
      LCD_ShowString(30,110,200,16,16,"2015/1/18");
      LCD_ShowString(30,130,200,16,16,"KEY0

ight Mode");
      LCD_ShowString(30,150,200,16,16,"KEY1:Saturation");
      LCD_ShowString(30,170,200,16,16,"KEY_UP:Contrast");
      LCD_ShowString(30,190,200,16,16,"TPAD:Effects");
      LCD_ShowString(30,210,200,16,16,"OV7670 Init...");
      while(OV7670_Init())
      {
            LCD_ShowString(30,210,200,16,16,"OV7670 Error!!");
            delay_ms(200);
            LCD_Fill(30,210,239,246,WHITE);
            delay_ms(200);
      }
      LCD_ShowString(30,210,200,16,16,"OV7670 Init OK");
      delay_ms(1500);
      OV7670_Light_Mode(lightmode);
      OV7670_Color_Saturation(saturation);
      OV7670_Contrast(contrast);
      OV7670_Special_Effects(effect);
      TIM6_Int_Init(10000,7199);
      EXTI8_Init();
      OV7670_Window_Set(12,176,240,320);
      OV7670_CS=0;
      LCD_Clear(BLACK);
      while(1)
      {

key=KEY_Scan(0);
            camera_refresh();
if(ab1>ab2)
{
ab3=ab1-ab2;
}
else
{
ab3=ab2-ab1;
}
if(ab3>10000)
{
LCD_ShowString(30,20,200,16,16,"someone is here");
}
sprintf(tmp1,"%u",ab1);
   LCD_ShowString(30,60,200,16,16,tmp1);
sprintf(tmp2,"%u",ab2);
LCD_ShowString(30,100,200,16,16,tmp2);

if(key==WKUP_PRES)
            {
               delay_ms(10000);
}
   ab2=ab1;
   ab1=0;

            i++;
            if(i==15)
            {
                     i=0;
                     LED0=!LED0;
               }
      }
}