Go 车牌识别 （网络图片| 本地图片）

先注册一个百度云账号，然后选择 人工智能 文字识别，创建一个应用。获取appkey secret 。

网络图片

package mainimport (   "encoding/base64"   "encoding/json"   "io/ioutil"   "log"   "net/http"   "net/url")func main() {   handler := PlateHandler{}   appKey := "11111"   secret := "11111111z"   accessToken := handler.GetAccessToken(appKey, secret)   log.Println("获取到的accessToken:",accessToken)   pictureUrl := "https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2181674788,2215933125&fm=26&gp=0.jpg"   plate,err:=handler.GetPlate(pictureUrl,accessToken)   if err!=nil{      log.Fatal("获取车牌失败",err)   }   log.Println("获取到的车牌:",plate)}type accessTokenInfo struct {   AccessToken string `json:"access_token"`   ExpiresIn   int64  `json:"expires_in""`}type WordResult struct {   Number string `json:"number"`}type Data struct {   WordsResult WordResult `json:"words_result"`}type PlateHandler struct {}func (handler *PlateHandler) GetAccessToken(appKey string, appSecret string) (accessToken string) {   url := "https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id="+appKey+"&client_secret="+appSecret   response, err := http.Get(url)   if err != nil {      log.Fatal(err)      return ""   }   data, err := ioutil.ReadAll(response.Body)   if err != nil {      log.Fatal(err)      return ""   }   info := accessTokenInfo{}   json.Unmarshal(data, &info)   log.Print("请求accessToken返回的数据:", string(data))   return info.AccessToken}func (handler *PlateHandler) GetPlate(picture_url string,accessToken string) (plate string, err error) {   rsp, err := http.Get(picture_url)   if err != nil {      log.Fatal(err)      return "", err   }   image, _ := ioutil.ReadAll(rsp.Body)   image_value, err2 := url.Parse(base64.StdEncoding.EncodeToString(image))   if err2 != nil {      log.Fatal(err)      return "", err   }   to_url := "https://aip.baidubce.com/rest/2.0/ocr/v1/license_plate?access_token="+accessToken   values := url.Values{}   values.Add("image", image_value.EscapedPath())   values.Add("multi_detect", "false")   rsp2, err := http.PostForm(to_url, values)   defer rsp2.Body.Close()   if err != nil {      log.Fatal(err)      return "", err   }   data, err := ioutil.ReadAll(rsp2.Body)   if err != nil {      log.Fatal(err)      return "", err   }   log.Println("请求车牌返回的数据:",string(data))   m := Data{}   err = json.Unmarshal(data, &m)   if err != nil {      log.Fatal(err)      return "", err   }   log.Println(m)   return m.WordsResult.Number, nil}

本地图片

package mainimport (   "encoding/base64"   "encoding/json"   "io/ioutil"   "log"   "net/http"   "net/url"   "os")func main() {   handler := PlateHandler{}   appKey := "111111111"   secret := "111111111"   accessToken := handler.GetAccessToken(appKey, secret)   log.Println("获取到的accessToken:",accessToken)   pictureUrl := "day02/img/1.png"    // 路径，从根开始写   plate,err:=handler.GetPlate(pictureUrl,accessToken)   if err!=nil{      log.Fatal("获取车牌失败",err)   }   log.Println("获取到的车牌:",plate)}type accessTokenInfo struct {   AccessToken string `json:"access_token"`   ExpiresIn   int64  `json:"expires_in""`}type WordResult struct {   Number string `json:"number"`}type Data struct {   WordsResult WordResult `json:"words_result"`}type PlateHandler struct {}func (handler *PlateHandler) GetAccessToken(appKey string, appSecret string) (accessToken string) {   url := "https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id="+appKey+"&client_secret="+appSecret   response, err := http.Get(url)   if err != nil {      log.Fatal(err)      return ""   }   data, err := ioutil.ReadAll(response.Body)   if err != nil {      log.Fatal(err)      return ""   }   info := accessTokenInfo{}   json.Unmarshal(data, &info)   log.Print("请求accessToken返回的数据:", string(data))   return info.AccessToken}func (handler *PlateHandler) GetPlate(picture_url string,accessToken string) (plate string, err error) {   ff, _ := os.Open(picture_url)   sourcebuffer := make([]byte, 50000000000)   n, _ := ff.Read(sourcebuffer)   //base64压缩   sourcestring := base64.StdEncoding.EncodeToString(sourcebuffer[:n])   to_url := "https://aip.baidubce.com/rest/2.0/ocr/v1/license_plate?access_token="+accessToken   values := url.Values{}   values.Add("image", sourcestring)   values.Add("multi_detect", "false")   rsp2, err := http.PostForm(to_url, values)   defer rsp2.Body.Close()   if err != nil {      log.Fatal(err)      return "", err   }   data, err := ioutil.ReadAll(rsp2.Body)   if err != nil {      log.Fatal(err)      return "", err   }   log.Println("请求车牌返回的数据:",string(data))   m := Data{}   err = json.Unmarshal(data, &m)   if err != nil {      log.Fatal(err)      return "", err   }   log.Println(m)   return m.WordsResult.Number, nil}

结果

2019/12/25 11:48:34 请求车牌返回的数据: {"log_id": 8926648569804002425, "words_result": {"color": "blue", "number": "豫A99999", "probability": [0.9014493227005005, 0.9014158248901367, 0.900929868221283, 0.9012478590011597, 0.901341438293457, 0.9010871052742004, 0.9010393619537354], "vertexes_location": [{"y": 181, "x": 241}, {"y": 173, "x": 439}, {"y": 229, "x": 442}, {"y": 236, "x": 244}]}}2019/12/25 11:48:34 {{豫A99999}}2019/12/25 11:48:34 获取到的车牌: 豫A99999