如何解决“至少需要两个类才能执行LDA"? [英] How to fix "At least two classes are needed to perform a LDA"?

问题描述

我正在尝试运行此带有OpenCV的示例，但可以运行它:

I'm trying to run this sample with OpenCV, but running it:

./facerec_video haarcascade_frontalface_alt.xml csv_align -1  

给我这个错误:

OpenCV错误:错误的参数(执行LDA至少需要两个类.原因:只提供了一个类！)在lda中，文件/build/buildd/opencv-2.4.8+dfsg1/modules/contrib/src/lda.cpp，第1010行 抛出'cv :: Exception'实例后调用终止 what():/build/buildd/opencv-2.4.8 + dfsg1/modules/contrib/src/lda.cpp:1010:错误:(-5)执行LDA至少需要两个类.原因:只上了一堂课！在功能lda

OpenCV Error: Bad argument (At least two classes are needed to perform a LDA. Reason: Only one class was given!) in lda, file /build/buildd/opencv-2.4.8+dfsg1/modules/contrib/src/lda.cpp, line 1010 terminate called after throwing an instance of 'cv::Exception' what(): /build/buildd/opencv-2.4.8+dfsg1/modules/contrib/src/lda.cpp:1010: error: (-5) At least two classes are needed to perform a LDA. Reason: Only one class was given! in function lda

我该如何解决?

Ps .: xml是标准的 OpenCV ，而csv是具有2个图像的示例

Ps.: The xml is the standard OpenCV, and the csv is a sample with 2 images

推荐答案

我遇到了同样的问题，并且解决了将csv.ext文件更改为以下样式的问题:

I had the same issue and I solved changing my csv.ext file to this style:

C:\ Users \ fsb \ Desktop \ image1_20_20_70_70.jpg; 0 C:\ Users \ fsb \ Desktop \ face_20_20_70_70.jpg; 1

C:\Users\fsb\Desktop\image1_20_20_70_70.jpg;0 C:\Users\fsb\Desktop\face_20_20_70_70.jpg;1

检查文件是否符合要求，然后重试.

Check if your file is according this and try again.

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