OpenCV

How to map optical flow field (float) to pixel data (char) for image warping?

旧时模样 提交于 2020-12-30 20:09:57
问题 I've been playing with the optical flow functions in OpenCV and am stuck. I've successfully generated X and Y optical flow fields/maps using the Farneback method, but I don't know how to apply this to the input image coordinates to warp the images. The resulting X and Y fields are of 32bit float type (0-1.0), but how does this translate to the coordinates of the input and output images? For example, 1.0 of what? The width of the image? The difference between the two? Plus, I'm not sure what

开源!基于SpringBoot的车牌识别系统(附项目地址)

坚强是说给别人听的谎言 提交于 2020-12-30 14:36:35
今天推荐一个基于SpringBoot的车牌识别系统。 介绍 spring boot + maven 实现的车牌识别及训练系统 基于java语言的深度学习项目,在整个开源社区来说都相对较少;而基于java语言实现车牌识别EasyPR-Java项目,最后的更新已经是五年以前。 本人参考了EasyPR原版C++项目、以及fan-wenjie的EasyPR-Java项目;同时查阅了部分opencv官方4.0.1版本C++的源码,结合个人对java语言理解,整理出当前项目 这是一个入门级教程项目,本人目前也正在学习图片识别相关技术;大牛请绕路 当前项目在原有EasyPR项目基础上,增加了绿牌识别功能,只不过当前的训练库文件包含绿牌的样本太少,还需要重新增加绿牌样本的训练,后续会逐步上传 当前已经添加基于svm算法的车牌检测训练、以及基于ann算法的车牌号码识别训练功能 后续会逐步加入证件识别、人脸识别等功能 包含功能 黄 蓝 绿 黄蓝绿车牌检测及车牌号码识别 单张图片、多张图片并发、单图片多车牌检测及识别 图片车牌检测训练 图片文字识别训练 包含两种依赖包的实现方式:基于org.bytedeco.javacpp包的实现方式;基于org.opencv官方包的实现方式 org.opencv官方包,提供了java语言api;java项目可以通过build path方式或者环境变量的方式引用;

Python: How to cut out an area with specific color from image (OpenCV, Numpy)

ⅰ亾dé卋堺 提交于 2020-12-30 09:46:36
问题 so I've been trying to code a Python script, which takes an image as input and then cuts out a rectangle with a specific background color. However, what causes a problem for my coding skills, is that the rectangle is not on a fixed position in every image (the position will be random). I do not really understand how to manage the numpy functions. I also read something about OpenCV, but I'm totally new to it. So far I just cropped the images through the ".crop" function, but then I would have

How to find branch point from binary skeletonize image

末鹿安然 提交于 2020-12-30 03:49:00
问题 I use Python OpenCV to skeletonize an image like this: and I want to find the branch point of the skeleton I have no idea how to do it. Any thoughts? 回答1: The main idea here is to look in the neighborhood. You can use a 8-conected neighborhood for every pixels ([1 1 1; 1 1 1; 1 1 1], and the center is the pixel for which the neighborhood being explored!). At every branch point, the degree of the pixel will be > 2, while regular pixels will have a degree of 2 (i.e., connected to 2 pixels in

How to find branch point from binary skeletonize image

孤人 提交于 2020-12-30 03:46:38
问题 I use Python OpenCV to skeletonize an image like this: and I want to find the branch point of the skeleton I have no idea how to do it. Any thoughts? 回答1: The main idea here is to look in the neighborhood. You can use a 8-conected neighborhood for every pixels ([1 1 1; 1 1 1; 1 1 1], and the center is the pixel for which the neighborhood being explored!). At every branch point, the degree of the pixel will be > 2, while regular pixels will have a degree of 2 (i.e., connected to 2 pixels in

How to find branch point from binary skeletonize image

孤街浪徒 提交于 2020-12-30 03:46:23
问题 I use Python OpenCV to skeletonize an image like this: and I want to find the branch point of the skeleton I have no idea how to do it. Any thoughts? 回答1: The main idea here is to look in the neighborhood. You can use a 8-conected neighborhood for every pixels ([1 1 1; 1 1 1; 1 1 1], and the center is the pixel for which the neighborhood being explored!). At every branch point, the degree of the pixel will be > 2, while regular pixels will have a degree of 2 (i.e., connected to 2 pixels in

Python 函数合集:足足 68 个内置函数请收好

╄→尐↘猪︶ㄣ 提交于 2020-12-29 10:55:55
“ 来源:pypypypy www.cnblogs.com/pypypy/p/12011506.html 内置函数就是python给你提供的, 拿来直接用的函数,比如print.,input等。截止到python版本3.6.2 python一共提供了68个内置函数。 # 68个内置函数 # abs()   dict()    help ()   min()   setattr() # all()   dir()   hex()   next()   slice() # any()   divmod()   id()   object()   sorted() # ascii()   enumerate()   input()   oct()   staticmethod() # bin()    eval ()   int()   open()   str() # bool()    exec ()   isinstance()   ord()   sum() # bytearray()   filter()   issubclass()   pow()   super() # bytes()   float()   iter()    print ()   tuple() # callable()   format()   len()   property()    type ()

Demo分享丨看ModelArts与HiLens是如何让车自己跑起来的

不羁的心 提交于 2020-12-29 10:53:11
摘要: 基于HiLens Kit已经基本开发完成,可部署到HiLens Kit,模型的选择为基于DarkNet53的YOLOv3模型,权重为基于COCO2014训练的数据集,而车道线的检测是基于OpenCV的传统方法实现的,可通过ModelArts AI Gallery与HiLens Kit全流程端云协同开发部署。 点击传送门,先来看看最终视频效果吧→→ (PS:请忽略背景音乐)! 主体流程介绍 : (可选,忽略亦可,取决于摄像头质量,对于相机畸变较大的需要先计算相机的畸变矩阵和失真系数,对图片进行校正)图片校正; 截取感兴趣区域,仅对包含车道线信息的图像区域进行处理; 对感兴趣区域使用透视变换; 针对不同颜色的车道线,不同光照条件下的车道线,不同清晰度的车道线,根据不同的颜色空间使用不同的梯度阈值,颜色阈值进行不同的处理。并将每一种处理方式进行融合,得到车道线的二进制图; 提取二进制图中属于车道线的像素; 对二进制图片的像素进行直方图统计,统计左右两侧的峰值点作为左右车道线的起始点坐标进行曲线拟合; 使用二次多项式分别拟合左右车道线的像素点(对于噪声较大的像素点,可以进行滤波处理,或者使用随机采样一致性算法进行曲线拟合); 计算车道曲率及车辆相对车道中央的偏离位置; 效果显示( 可行域显示 , 曲率 和 位置显示 )。 检测驾驶过程中道路中其他车辆状态,显示 车辆类别 、 置信度

Cant make opencv work on heroku

纵然是瞬间 提交于 2020-12-29 06:46:48
问题 I'm trying to make opencv work on Heroku but i have the following error on the server's log file : 2017-10-05T23:17:08.145096+00:00 heroku[web.1]: State changed from crashed to starting 2017-10-05T23:17:19.477843+00:00 heroku[web.1]: Starting process with command `python Main.py` 2017-10-05T23:17:23.469550+00:00 heroku[web.1]: State changed from starting to crashed 2017-10-05T23:17:23.458477+00:00 heroku[web.1]: Process exited with status 1 2017-10-05T23:17:23.268234+00:00 app[web.1]:

Cant make opencv work on heroku

风流意气都作罢 提交于 2020-12-29 06:46:08
问题 I'm trying to make opencv work on Heroku but i have the following error on the server's log file : 2017-10-05T23:17:08.145096+00:00 heroku[web.1]: State changed from crashed to starting 2017-10-05T23:17:19.477843+00:00 heroku[web.1]: Starting process with command `python Main.py` 2017-10-05T23:17:23.469550+00:00 heroku[web.1]: State changed from starting to crashed 2017-10-05T23:17:23.458477+00:00 heroku[web.1]: Process exited with status 1 2017-10-05T23:17:23.268234+00:00 app[web.1]: