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This paper only introduces the multi-classification process and some minor problems encountered in it. The accuracy rate has been relatively low and the efficiency is relatively low. It is only a simple explanation of the process. 1. Loading VOC datasets There are many blogs that load data sets on the Internet. Here we just m ...

1 Overview Because of the most urgent need for flame detection, at first, we thought about using traditional machine learning algorithm to do it. Later, we found that the current flame detection is based on color. In actual scenes, there are often serious false alarms due to the external effects of street lights and the sun. Later, we decided ...

This article is inspired by http://blog.csdn.net/dancing_night/article/details/51545524. There is a pointer bits() in QImage to point to the memory header address of the stored pixels. And cv::Mat also has a member data, which also points to the memory header address of the storage pixel. So, if I want to convert QImage into cv::Mat, can I jus ...

Face recognition is always seen in sci-fi movies. Now we can also program it. Ha ha ~ OpenCV is an Intel < open source computer vision library. It consists of a series of C functions and a few C++ classes. It realizes many general algorithms in image processing and computer vision. OpenCV has a cross-platform, high-level API ...

EXIF format (or JPEG, you can see the wiki explanation, for orientation problem, it is called EXIF format and JFIF distinguish) with orientation information in the picture (that is, the picture may actually rotate 90 or 180 degrees or 270 degrees). If the digital device is stored in EXIF format, even if the device rotates 90 or 180 degrees or 2 ...

Original Book Code Address In this chapter, we will learn how to apply cool geometric effects to images. Knowledge points How to install OpenCV-Python How to read, display and save images How to convert to multiple color spaces How to apply geometric transformations such as translation, rotation, and scaling How to use affine and projection tr ...

image.png Last article Face Frame Detection It has been introduced that if we detect the information of face location from video stream, based on these contents, we continue to expand downward to get the information of 68 key points of face. The reason why we want to get the information of face location is to prepare for the ...

This week, bloggers used the SIFT algorithm in OpenCV4Android to extract image features. The reasonably SIFT algorithm is packaged for you. Generally, it should be completed very soon by adjusting a package. But using OpenCV in Android configuration is a difficult problem. Usually when you run app, your mobi ...

(1) Detailed description of CV_8UC1,CV_8UC2 and other parameters when Mat matrix (image container) is created Mat is not only a very useful image container class, but also a general matrix class. There are many ways to create a Mat object. Let's first look at the source code of Mat matrix/image container class in OpenCv: Usin ...

1. Preface Because the author encountered various pits when configuring the NDK environment, and had some insights in the process of climbing the pit, I wrote a blog to describe in detail the process of configuring NDK using CMAKE mode in Android Studio 3.0.1 (version >= 2.2), hoping to help you.   2. Preparations 2.1 De ...