微信小程序实现图片文字识别提取_微信小程序拍照扫描识别范例

效果查看：

1.先去百度云申请OCR文本识别接口API，目前免费，不收取任何费用。

2.微信公众平台，注册微信小程序，并下载导入demo项目，准备工作做完后，及进入正题。

3.创建文字识别模块，项目结构如下图所示

4.wenzi.js文件

// miniprogram/pages/wenzi/wenzi.js
const app = getApp()
Page({

/**
* 页面的初始数据
*/
data: {
imgPath: '../../images/wenzi.jpg',
items: null,
},

/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
},

doClickWork: function () {
var that = this;
var score = 2;
//清空数据
that.setData({
items: null
})

that.selectImage().then(res => {
console.log("[图片数据]", res);

that.scanImageInfo(res.data).then(res => {
console.log("[识别文字]", res);
if (res.data.words_result) {
if (res.data.words_result_num!=0){
that.setData({
items: res.data.words_result
})

//添加次数
app.addCount('wenzi')
//扣除积分
app.updateScore(app.globalData.score - score)
}else{
wx: wx.showToast({
title: "没有识别到文字",
icon: 'none',
mask: true,
})
}
} else {
wx: wx.showToast({
title: res.data.error_msg,
icon: 'none',
mask: true,
})
}
})
})
},

//获取本地图片
selectImage: function () {
var that = this;
// 选择图片
return new Promise(function (resolve, reject) {
wx.chooseImage({
count: 1,
sizeType: ['compressed'],
sourceType: ['album', 'camera'],
success: res => {

console.log("[选择图片]", res);
that.setData({
imgPath: res.tempFilePaths[0]
})

//获取图片数据
wx.getFileSystemManager().readFile({
filePath: res.tempFilePaths[0],
encoding: "base64",
success: resolve,
fail: reject
})

},
fail: reject
})

})
},

//扫描图片中的数据
scanImageInfo: function (imageData) {
var that = this;
// const detectUrl = `https://aip.baidubce.com/rest/2.0/ocr/v1/general_basic?access_token=${getApp().globalData.baiduToken}`;//基础版本
const detectUrl = `https://aip.baidubce.com/rest/2.0/ocr/v1/accurate_basic?access_token=${getApp().globalData.baiduToken}`;//高精度版本｛getApp().globalData.baiduToken为获取全局配置文件里的百度key,token｝

//显示加载界面
wx.showLoading({
title: '加载中',
mask:true,
});

return new Promise(function (resolve, reject) {
wx.request({
url: detectUrl,
data: {
image: imageData
},
method: 'POST',
dataType: "json",
header: {
'content-type': 'application/x-www-form-urlencoded'
},
success: res => {
//隐藏加载界面
wx.hideLoading()
resolve(res);
},
fail: res => {
wx: wx.showToast({
title: '忙碌,稍后再试',
icon: 'none',
mask: true,
duration: 2000
})
reject(res);
},
})
})
},
})

5.wenzi.json文件

{
"usingComponents": {},
"navigationBarTitleText": "文字识别"
}

6.wenzi.wxml文件

<!--miniprogram/pages/wenzi/wenzi.wxml-->
<!-- <button open-type="share" class="button_share">分享</button> -->

<view class="view_main">
<image class="image_type" src="{{imgPath}}" mode="aspectFit"></image>
<button class="button_type" bindtap="doClickWork">拍照/相册</button>

<view class="view_items">
<text wx:for="{{items}}" wx:key="{{item}}" selectable='true' class="text_son">
{{item.words}}
</text>
</view>

</view>

7.wenzi.wxss文件

.button_share {
width: 150rpx;
height: 100rpx;
position: fixed;
top: 500rpx;
right: 0rpx;
display: flex;
justify-content: center;
align-items: center;
background-color: #fea128;
color: white;
border-radius: 50rpx 0rpx 0rpx 50rpx;
}

.view_main {
height: 100%;
width: 100%;
display: flex;
align-items: center;
flex-direction: column;
}

.image_type {
margin-top: 30rpx;
height: 400rpx;
width: 100%;
}

.button_type {
width: 200rpx;
height: 120rpx;
padding: 0;
margin-top: 50rpx;
margin-bottom: 20rpx;
font-size: 14px;
color: white;
display: flex;
justify-content: center;
align-items: center;
/* border-radius: 21rpx; */
background-color: #2880fe;
}

.view_items {
margin-bottom: 30rpx;
width: 90%;
display: flex;
align-items: center;
flex-direction: column;
/* flex-wrap: wrap; */
}

.view_item {
width: 100%;
margin-top: 15rpx;
background-color: white;
display: flex;
align-items: center;
flex-direction: column;
border-radius: 5rpx;
padding: 20rpx;
box-shadow: 1.5px 1.5px 1.5px grey;
}

.text_main {
margin-left: 30rpx;
margin-bottom: 10rpx;
color: #2880fe;
font-weight: 700;
width: 100%;
font-size: 15px;
}

.text_son {
margin-left: 30rpx;
color: #2880fe;
width: 100%;
font-size: 14px;
}