python打开相机,用鼠标左键框选矩形区域,支持一次框选多个矩形区域,通过鼠标右标清除上一次画的矩形。

方案一

python 复制代码
import cv2

# Global variables
rectangles = []
current_rectangle = []
drawing = False

# Mouse callback function
def mouse_callback(event, x, y, flags, param):
    global rectangles, current_rectangle, drawing

    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        current_rectangle = [(x, y)]

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        current_rectangle.append((x, y))
        rectangles.append(tuple(current_rectangle))
        current_rectangle = []

    elif event == cv2.EVENT_RBUTTONDOWN:
        rectangles.pop()

# Open camera
cap = cv2.VideoCapture(0)

# Create a window and set mouse callback
cv2.namedWindow('Camera')
cv2.setMouseCallback('Camera', mouse_callback)

while True:
    # Read frame from camera
    ret, frame = cap.read()

    # Draw rectangles on the frame
    for rect in rectangles:
        cv2.rectangle(frame, rect[0], rect[1], (0, 255, 0), 2)

    # Display the frame
    cv2.imshow('Camera', frame)

    # Check for key press
    key = cv2.waitKey(1)
    if key == 27:  # Press 'Esc' to exit
        break

# Release the camera and destroy all windows
cap.release()
cv2.destroyAllWindows()

方案二

python 复制代码
import cv2

# Global variables
rectangles = []
current_rectangle = []
drawing = False
rect_x = 0
rect_y = 0

# Mouse callback function
def mouse_callback(event, x, y, flags, param):
    global rectangles, current_rectangle, drawing

    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        current_rectangle = [(x, y)]
        global rect_x, rect_y
        rect_x = x
        rect_y = y

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False
        current_rectangle.append((x, y))
        rectangles.append(tuple(current_rectangle))
        current_rectangle = []


    elif event == cv2.EVENT_RBUTTONDOWN:
        rectangles.pop()

# Open camera
cap = cv2.VideoCapture(0)

# Create a window and set mouse callback
cv2.namedWindow('Camera')
cv2.setMouseCallback('Camera', mouse_callback)

while True:
    # Read frame from camera
    ret, frame = cap.read()

    # Draw rectangles on the frame
    for rect in rectangles:
        cv2.rectangle(frame, rect[0], rect[1], (0, 255, 0), 2)

    # Draw current rectangle in real-time
    if drawing:
        cv2.rectangle(frame, current_rectangle[0], (rect_x, rect_y), (0, 255, 0), 2)

    # Display the frame
    cv2.imshow('Camera', frame)

    # Check for key press
    key = cv2.waitKey(1)
    if key == 27:  # Press 'Esc' to exit
        break

# Release the camera and destroy all windows
cap.release()
cv2.destroyAllWindows()

下一步修改优化

a 在图像区域内实时显示鼠标所在位置的十字线

b 实时显示绘制框的过程

相关推荐
酷飞飞18 分钟前
Python网络与多任务编程:TCP/UDP实战指南
网络·python·tcp/ip
数字化顾问1 小时前
Python:OpenCV 教程——从传统视觉到深度学习:YOLOv8 与 OpenCV DNN 模块协同实现工业缺陷检测
python
学生信的大叔2 小时前
【Python自动化】Ubuntu24.04配置Selenium并测试
python·selenium·自动化
诗句藏于尽头4 小时前
Django模型与数据库表映射的两种方式
数据库·python·django
智数研析社4 小时前
9120 部 TMDb 高分电影数据集 | 7 列全维度指标 (评分 / 热度 / 剧情)+API 权威源 | 电影趋势分析 / 推荐系统 / NLP 建模用
大数据·人工智能·python·深度学习·数据分析·数据集·数据清洗
扯淡的闲人4 小时前
多语言编码Agent解决方案(5)-IntelliJ插件实现
开发语言·python
moxiaoran57534 小时前
Flask学习笔记(一)
后端·python·flask
秋氘渔5 小时前
迭代器和生成器的区别与联系
python·迭代器·生成器·可迭代对象
Gu_shiwww5 小时前
数据结构8——双向链表
c语言·数据结构·python·链表·小白初步
Dxy12393102166 小时前
python把文件从一个文件复制到另一个文件夹
开发语言·python