激萌の小宅 2023-11-27 08:37:39 小宅博客 OpenCv基础 406 0

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<h1 style="font-size: 32px; font-weight: bold; border-bottom: 2px solid rgb(204, 204, 204); padding: 0px 4px 0px 0px; text-align: left; margin: 0px 0px 10px;">英文字母的OCR </h1>下面这段代码是 <a href="/api/system/download?file=OpenCV-Python-Tutorial-%E4%B8%AD%E6%96%87%E7%89%88.pdf" target="_blank" title="OpenCV-Python-Tutorial-中文版.pdf （P268）">OpenCV-Python-Tutorial-中文版.pdf （P268）</a>中的实现， <p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; list-style: none; border: 0px; overflow-wrap: break-word; word-break: break-all; line-height: 1.5em; font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; color: rgb(51, 51, 51); text-wrap: wrap; box-sizing: border-box;">当前系列所有demo下载地址：<p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; list-style: none; border: 0px; overflow-wrap: break-word; word-break: break-all; line-height: 1.5em; font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; color: rgb(51, 51, 51); text-wrap: wrap; box-sizing: border-box;"><a href="https://github.com/GaoRenBao/OpenCv4-Demo" target="_blank" style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(0, 102, 0); transition-duration: 0.2s; transition-property: opacity; outline: none; opacity: 0.8;">https://github.com/GaoRenBao/OpenCv4-Demo</a><p style="margin-top: 0px; margin-bottom: 10px; padding: 0px; list-style: none; border: 0px; overflow-wrap: break-word; word-break: break-all; line-height: 1.5em; font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; color: rgb(51, 51, 51); text-wrap: wrap; box-sizing: border-box;"><a href="https://gitee.com/fuckgrb/OpenCv4-Demo" target="_blank" style="margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(0, 102, 0); transition-duration: 0.2s; transition-property: opacity; outline: none;">https://gitee.com/fuckgrb/OpenCv4-Demo</a><p style="margin-top: 0px; margin-bottom: 10px; text-wrap: wrap; padding: 0px; list-style: none; border: 0px; overflow-wrap: break-word; word-break: break-all; line-height: 1.5em; font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; box-sizing: border-box; color: rgb(51, 51, 51);">不同编程语言对应的OpenCv版本以及开发环境信息如下： <table border="1" style="border-right: none; border-bottom: none; border-image: initial; border-left: 1px solid rgb(102, 102, 102); border-top: 1px solid rgb(102, 102, 102);"><tbody><tr class="firstRow"><td width="81" valign="top" style="border-color: windowtext rgb(102, 102, 102) rgb(102, 102, 102) windowtext; border-bottom-width: 1px; border-bottom-style: solid; border-right-width: 1px; border-right-style: solid; padding: 5px;">语言</td><td width="223" valign="top" style="border-color: windowtext rgb(102, 102, 102) rgb(102, 102, 102) windowtext; border-bottom-width: 1px; border-bottom-style: solid; border-right-width: 1px; border-right-style: solid; padding: 5px;">OpenCv版本</td><td width="242" valign="top" style="border-color: windowtext rgb(102, 102, 102) rgb(102, 102, 102) windowtext; border-bottom-width: 1px; border-bottom-style: solid; border-right-width: 1px; border-right-style: solid; padding: 5px;">IDE</td></tr><tr><td width="81" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">C#</td><td width="223" valign="top" style="border-top: none; border-left-color: windowtext; word-break: break-all; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">OpenCvSharp4.4.8.0.20230708</td><td width="242" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">Visual Studio 2022</td></tr><tr><td width="81" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">C++</td><td width="223" valign="top" style="border-top: none; border-left-color: windowtext; word-break: break-all; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">OpenCv-4.5.5-vc14_vc15</td><td width="242" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">Visual Studio 2022</td></tr><tr><td width="81" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">Python</td><td width="223" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">OpenCv-Python (4.6.0.66)</td><td width="242" valign="top" style="border-top: none; border-left-color: windowtext; border-bottom: 1px solid rgb(102, 102, 102); border-right: 1px solid rgb(102, 102, 102); padding: 5px;">PyCharm Community Edition 2022.1.3</td></tr></tbody></table> 一些必要的文件请到git上去下载。 <strong style="font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(51, 51, 51); ">C#版本代码如下：<pre class="brush:c#;toolbar:false">【略】</pre> <strong style="font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(51, 51, 51); ">C++版本代码如下：<pre class="brush:cpp;toolbar:false">【略】</pre> <strong style="font-family: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "WenQuanYi Micro Hei", Arial, sans-serif; margin: 0px; padding: 0px; list-style: none; border: 0px; color: rgb(51, 51, 51); ">Python版本代码如下：<pre class="brush:python;toolbar:false">import cv2 import numpy as np # Load the data, converters convert the letter to a number data = np.loadtxt('letter-recognition.data', dtype='float32', delimiter=',',                   converters={0: lambda ch: ord(ch) - ord('A')})#20000个 # split the data to two, 10000 each for train and test train, test = np.vsplit(data, 2) # split trainData and testData to features and responses responses, trainData = np.hsplit(train, [1]) labels, testData = np.hsplit(test, [1]) # Initiate the kNN, classify, measure accuracy. knn = cv2.ml.KNearest_create() knn.train(trainData, cv2.ml.ROW_SAMPLE, responses) ret, result, neighbours, dist = knn.findNearest(testData, k=5) correct = np.count_nonzero(result == labels) accuracy = correct * 100.0 / 10000 print('准确率', accuracy)#93.06 #准确率 到了 93.22%。同样你可以  增加训练样本的数量来提 准确率。 # save the data np.savez('knn_data_alphabet.npz', train_alphabet=train, train_labels_alphabet=responses,test_alphabet=testData,test_labels_alphabet=labels) #怎样预测字母？跟预测数字的一样</pre>

英文字母的OCR

下面这段代码是 OpenCV-Python-Tutorial-中文版.pdf （P268）中的实现，

当前系列所有demo下载地址：

https://github.com/GaoRenBao/OpenCv4-Demo

https://gitee.com/fuckgrb/OpenCv4-Demo

不同编程语言对应的OpenCv版本以及开发环境信息如下：

语言	OpenCv版本	IDE
C#	OpenCvSharp4.4.8.0.20230708	Visual Studio 2022
C++	OpenCv-4.5.5-vc14_vc15	Visual Studio 2022
Python	OpenCv-Python (4.6.0.66)	PyCharm Community Edition 2022.1.3

一些必要的文件请到git上去下载。

C#版本代码如下：

【略】

C++版本代码如下：

【略】

Python版本代码如下：

import cv2
import numpy as np

# Load the data, converters convert the letter to a number
data = np.loadtxt('letter-recognition.data', dtype='float32', delimiter=',',
                  converters={0: lambda ch: ord(ch) - ord('A')})#20000个
# split the data to two, 10000 each for train and test
train, test = np.vsplit(data, 2)
# split trainData and testData to features and responses
responses, trainData = np.hsplit(train, [1])
labels, testData = np.hsplit(test, [1])

# Initiate the kNN, classify, measure accuracy.
knn = cv2.ml.KNearest_create()
knn.train(trainData, cv2.ml.ROW_SAMPLE, responses)
ret, result, neighbours, dist = knn.findNearest(testData, k=5)

correct = np.count_nonzero(result == labels)
accuracy = correct * 100.0 / 10000
print('准确率', accuracy)#93.06
#准确率 到了 93.22%。同样你可以  增加训练样本的数量来提 准确率。


# save the data
np.savez('knn_data_alphabet.npz', train_alphabet=train, train_labels_alphabet=responses,test_alphabet=testData,test_labels_alphabet=labels)

#怎样预测字母？跟预测数字的一样

英文字母的OCR

当前系列所有demo下载地址：

不同编程语言对应的OpenCv版本以及开发环境信息如下：

语言

OpenCv版本

IDE

OpenCvSharp4.4.8.0.20230708

Visual Studio 2022

C++

OpenCv-4.5.5-vc14_vc15

Visual Studio 2022

Python

OpenCv-Python (4.6.0.66)

PyCharm Community Edition 2022.1.3

一些必要的文件请到git上去下载。

C#版本代码如下：

【略】

C++版本代码如下：

【略】

Python版本代码如下：

import cv2 import numpy as np # Load the data, converters convert the letter to a number data = np.loadtxt('letter-recognition.data', dtype='float32', delimiter=',', converters={0: lambda ch: ord(ch) - ord('A')})#20000个 # split the data to two, 10000 each for train and test train, test = np.vsplit(data, 2) # split trainData and testData to features and responses responses, trainData = np.hsplit(train, [1]) labels, testData = np.hsplit(test, [1]) # Initiate the kNN, classify, measure accuracy. knn = cv2.ml.KNearest_create() knn.train(trainData, cv2.ml.ROW_SAMPLE, responses) ret, result, neighbours, dist = knn.findNearest(testData, k=5) correct = np.count_nonzero(result == labels) accuracy = correct * 100.0 / 10000 print('准确率', accuracy)#93.06 #准确率到了 93.22%。同样你可以增加训练样本的数量来提准确率。 # save the data np.savez('knn_data_alphabet.npz', train_alphabet=train, train_labels_alphabet=responses,test_alphabet=testData,test_labels_alphabet=labels) #怎样预测字母？跟预测数字的一样