python opencv通过按键采集图片源码
一、python版本
写了个python opencv的小demo,可以通过键盘按下字母s进行采集图像。
功能说明
“N” 新建文件夹 data/ 用来存储图像
“S” 开始采集图像,将采集到的图像放到 data/ 路径下
“Q” 退出窗口
python opencv源码
''' “N” 新建文件夹 data/ 用来存储图像 "S" 开始采集图像,将采集到的图像放到 data/ 路径下 “Q” 退出窗口 ''' import numpy as np # 数据处理的库 Numpy import cv2 # 图像处理的库 OpenCv import os # 读写文件 import shutil # 读写文件 from PIL import Image, ImageDraw, ImageFont # # OpenCv 调用摄像头 / Use camera cap = cv2.VideoCapture(0) cap.set(cv2.CAP_PROP_FRAME_WIDTH,1920) cap.set(cv2.CAP_PROP_FRAME_HEIGHT,1080) ''' #功能函数,只是用来往图片中显示汉字 #示例 img = cv2ImgAddText(cv2.imread('img1.jpg'), "大家好,我是片天边的云彩", 10, 65, (0, 0, 139), 20) 参数说明: img:OpenCV图片格式的图片 text:要写入的汉字 left:字符坐标x值 top:字符坐标y值 textColor:字体颜色 :textSize:字体大小 ''' def cv2ImgAddText(img, text, left, top, textColor=(0, 255, 0), textSize=20): if (isinstance(img, np.ndarray)): # 判断是否OpenCV图片类型 img = Image.fromarray(cv2.cvtColor(img, cv2.COLOR_BGR2RGB)) # 创建一个可以在给定图像上绘图的对象 draw = ImageDraw.Draw(img) # 字体的格式 fontStyle = ImageFont.truetype( "font/simsun.ttc", textSize, encoding="utf-8") # 绘制文本 draw.text((left, top), text, textColor, font=fontStyle) # 转换回OpenCV格式 return cv2.cvtColor(np.asarray(img), cv2.COLOR_RGB2BGR) # 存储图像的文件夹 current_dir = "" # 保存 图像 的路径 path_photos_from_camera = "data/" press_n_flag = 0 cnt_ss=0 while cap.isOpened(): flag, img_rd = cap.read() #print(img_rd.shape) kk = cv2.waitKey(2) # 待会要写的字体 / Font to write font = cv2.FONT_ITALIC # 4. 按下 'n' 新建存储人脸的文件夹 / press 'n' to create the folders for saving faces if kk == ord('N') or kk == ord('n'): current_dir = path_photos_from_camera #os.makedirs(current_dir) if os.path.isdir(current_dir): pass else: os.mkdir(current_dir) print('\n') print("新建的保存图像的文件夹 / Create folders: ", current_dir) press_n_flag = 1 # 已经按下 'n' / have pressed 'n' # 5. 按下 's' 保存摄像头中的图像到本地 / Press 's' to save image into local images if kk == ord('S') or kk == ord('s'): # 检查有没有先按'n'新建文件夹 / check if you have pressed 'n' if press_n_flag: cnt_ss += 1 cv2.imwrite(current_dir + "/img_" + str(cnt_ss) + ".jpg", img_rd) print("写入本地 / Save into:", str(current_dir) + "/img_face_" + str(cnt_ss) + ".jpg") else: print("请在按 'S' 之前先按 'N' 来建文件夹 / Please press 'N' before 'S'") # 添加说明 / Add some statements #cv2.putText(img_rd, "Face Register", (20, 40), font, 1, (0, 255, 0), 1, cv2.LINE_AA) img_rd = cv2ImgAddText(img_rd, "图片采集系统", 160, 25, (0, 255,0), 30) #cv2.putText(img_rd, "N: Create face folder", (20, 350), font, 0.8, (0, 255, 0), 1, cv2.LINE_AA) img_rd = cv2ImgAddText(img_rd, "N: 创建保存图像文件夹", 20, 350, (0, 255, 0), 20) #cv2.putText(img_rd, "S: Save current face", (20, 400), font, 0.8, (0, 255, 0), 1, cv2.LINE_AA) img_rd = cv2ImgAddText(img_rd, "S: 保存当前图片", 20, 400, (0, 255, 0), 20) #cv2.putText(img_rd, "Q: Quit", (20, 450), font, 0.8, (0, 0, 0), 1, cv2.LINE_AA) img_rd = cv2ImgAddText(img_rd, "Q: 退出", 20, 450, (0, 255, 0), 20) # 6. 按下 'Q' 键退出 / Press 'q' to exit if kk == ord('Q') or kk == ord('q'): break # 如果需要摄像头窗口大小可调 / Uncomment this line if you want the camera window is resizeable cv2.namedWindow("camera", 0) cv2.imshow("camera", img_rd) # 释放摄像头 / Release camera and destroy all windows cap.release() cv2.destroyAllWindows()
效果图
安装相关库
windows安装
pip install pillow
tx2/linux/…
sudo apt-get install python3-pillow
二、c语言版本
c语言源码
/***************************************************** 2021.5.18:按键采集图像 ******************************************************/ #include "opencv2/core/core.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "opencv2/calib3d/calib3d.hpp" #include "opencv2/highgui/highgui.hpp" #include <iostream> #include <fstream> using namespace cv; using namespace std; #define SRC_WIDTH 1920 #define SRC_HEIGHT 1080 int main() { //测试视频 VideoCapture capture; capture.open(1); //capture.open("v4l2src device=/dev/video4 ! video/x-raw,width=1920,height=1020,framerate=30/1 ! videoconvert ! appsink"); if (!capture.isOpened()) { printf("文件打开失败"); } capture.set(CAP_PROP_FRAME_WIDTH, SRC_WIDTH); //设置宽度 capture.set(CAP_PROP_FRAME_HEIGHT, SRC_HEIGHT); //设置长度 Mat frame; int n = 0; char* cstr = new char[120]; while (true) { capture >> frame; if (frame.data == NULL) { printf("Image is empty\n"); //writer.write(frame); break; //continue; } char kk=waitKey(2); if (kk == 'S' || kk == 's') { sprintf(cstr, "%s%d%s", "caliberation/", n++, ".jpg"); imwrite(cstr, frame); printf("保存了图片\n"); } namedWindow("111", 0);//参数为零,则可以自由拖动 imshow("111", frame); waitKey(2); } return 0; }
效果图
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