1.数梅派和opencv的图片截取

桃扇骨 2022-03-27 04:53 139阅读 0赞

条件： 树梅派安装opencv和免驱动的摄像头

c源码：

1 #include <stdio.h>
     2 #include <stdlib.h>
     3 #include "opencv.hpp"
     4 
     5 
     6 int main(int argc, char **argv) {
     7   if (argc < 2) {
     8     fprintf(stderr, "Usage: ./webcam output_image_file_name\n");
     9     return 1;
    10   }
    11 
    12   /* init camera */
    13   CvCapture* pCapture = cvCreateCameraCapture(0);                    //初始化摄像头
    14   if (NULL == pCapture) {
    15     fprintf(stderr, "Can't initialize webcam!\n");
    16     return 1;
    17   }
    18   cvSetCaptureProperty(pCapture, CV_CAP_PROP_FRAME_WIDTH, 640);        //设置图片宽度
    19   cvSetCaptureProperty(pCapture, CV_CAP_PROP_FRAME_HEIGHT, 480);    //设置图片高度
    20   cvSetCaptureProperty(pCapture, CV_CAP_PROP_BRIGHTNESS, 20);        //设置图片亮度
    21   cvSetCaptureProperty(pCapture, CV_CAP_PROP_CONTRAST, 10);            //设置图片对比度
    22   IplImage *pFrame = cvQueryFrame(pCapture);                        //抓取一张图片
    23   if(NULL == pFrame) {
    24     fprintf(stderr, "Can't get a frame!\n" );
    25     return 1;
    26   }
    27   cvSaveImage(argv[1], pFrame);                                //保存到指定位置
    28   cvReleaseCapture(&pCapture);                                        //释放空间
    29   return 0;
    30 }

脚本

capture-image-from-camera-using-opencv.sh

1 #!/bin/bash
     2 # A script to invoke a C program to capture an image from USB camera using OpenCV.
     3 #CURRENT_DIR 目录 
     4 #dirname "$0"  指定当前 
     5 
     6 CURRENT_DIR=`dirname "$0"
     7 WORKING_HOME=`cd "$CURRENT_DIR"; pwd`
     8 
     9 WEBCAM_SOURCE=$WORKING_HOME/webcam.c
    10 WEBCAM_BIN=$WORKING_HOME/webcam
    11 OUTPUT_IMAGE_FILE=$WORKING_HOME/webcam.jpg
    12 
    13 rm -f $OUTPUT_IMAGE_FILE
    14 
    15 # compile the source code if the executable bin not exists
    16 
    17 if [ ! -f $WEBCAM_BIN ]; then
    18     echo "Compiling $WEBCAM_SOURCE ..."
    19     g++ -I/usr/include/opencv2/  `pkg-config --cflags opencv --libs opencv` $WEBCAM_SOURCE -o $WEBCAM_BIN
    20     if [ $? -ne 0 ]; then
    21     echo "Failed to compile $WEBCAM_SOURCE"
    22     exit 1
    23     fi
    24 fi
    25 
    26 # run the program
    27 $WEBCAM_BIN $OUTPUT_IMAGE_FILE
    28 if [ $? -ne 0 ]; then
    29     echo "Failed to capture image and output to file $OUTPUT_IMAGE_FILE"
    30     exit 1
    31 fi