Dynamsoft Barcode Reader SDK一款多功能的條碼讀取控件，只需要幾行代碼就可以將條碼讀取功能嵌入到Web或桌面應(yīng)用程序。這可以節(jié)省數(shù)月的開發(fā)時(shí)間和成本。能支持多種圖像文件格式以及從攝像機(jī)或掃描儀獲取的DIB格式。使用Dynamsoft Barcode Reader SDK，你可以創(chuàng)建強(qiáng)大且實(shí)用的條形碼掃描儀軟件，以滿足你的業(yè)務(wù)需求。

在Python中使用Dynamsoft Barcode Reader

安裝Python包：

pip install dbr==7.2.2.3 

下面是一些簡單用法：

from dbr import DynamsoftBarcodeReader
 
dbr_reader = DynamsoftBarcodeReader()
dbr_reader.InitLicense('LICENSE-KEY') # Get the license from //www.dynamsoft.com/CustomerPortal/Portal/Triallicense.aspx
try:
    params = dbr_reader.GetRuntimeSettings()
    params["BarcodeFormatIds"] = dbr_reader.BF_ALL
    ret = dbr_reader.UpdataRuntimeSettings(params)
 
    start = time.time()
    dbr_results = dbr_reader.DecodeFile(filename)
    elapsed_time = time.time() - start
    textResults = dbr_results["TextResults"]
    resultsLength = len(textResults)
    if resultsLength > 0:
        for textResult in textResults:
            print(textResult["BarcodeFormatString"])
            print('Dynamsoft Barcode Reader: {}. Elapsed time: {}ms'.format(textResult["BarcodeText"], int(elapsed_time * 1000)))
 
        return textResults
    else:
        print("DBR failed to decode {}".format(filename))
except Exception as err:
    print("DBR failed to decode {}".format(filename))

要使用該條形碼SDK，您必須下載免費(fèi)試用版。

如何基于數(shù)據(jù)集獲得識別率

下載公共圖像數(shù)據(jù)集。

檢查圖像數(shù)據(jù)集，您會(huì)發(fā)現(xiàn)條形碼結(jié)果在文件名中，我們可以使用它們來驗(yàn)證解碼結(jié)果是否正確。

從目錄獲取文件列表：

import os
files = os.listdir(directory)

通過檢查后綴來過濾圖像文件：

files = [f for f in files if f.endswith('.jpg') or f.endswith('.png')]

分割文件名以獲得預(yù)期的結(jié)果：

expected_result = filename.split('_')[0]

當(dāng)條形碼結(jié)果與預(yù)期結(jié)果相符時(shí)增加計(jì)數(shù)：

if r1 == expected_result:
zbar_count += 1
 
if r2 == expected_result:
    dbr_count += 1
 
if r3 == expected_result:
    zxing_count += 1

計(jì)算ZBar，Dynamsoft Barcode Reader和ZXing的識別率：

total_count = len(files)
 
zbar_rate = zbar_count * 100 / total_count
print('ZBar recognition rate: {0:.2f}%'.format(zbar_rate))
 
dbr_rate = dbr_count * 100 / total_count
print('DBR recognition rate: {0:.2f}%'.format(dbr_rate))
 
zxing_rate = zxing_count * 100 / total_count
print('ZXing recognition rate: {0:.2f}%'.format(zxing_rate))

如何在Python中讀取和寫入Excel文件

在對條形碼SDK性能進(jìn)行基準(zhǔn)測試之后，最后一步是將結(jié)果保存到Excel文件中。您可以從這個(gè)中選擇一個(gè)Python包。

我選擇了openpyxl：

pip install openpyxl

創(chuàng)建一個(gè)新的工作簿或從現(xiàn)有的Excel文件中加載工作簿：

from openpyxl import utils
from openpyxl import Workbook
from openpyxl import load_workbook
from openpyxl.styles import Color, PatternFill
import os
 
def get_workbook(wb_name):
 
    if os.path.isfile(wb_name):
        wb = load_workbook(wb_name)
    else:
        wb = Workbook()
        ws = wb.active
        ws.title = 'Recognition Rate'
        ws['A1'] = 'File Name'
        # Set column width
        ws.column_dimensions[utils.get_column_letter(1)].width = 25
        ws['B1'] = 'Expected Results'
        ws.column_dimensions[utils.get_column_letter(2)].width = 20
        ws['C1'] = 'ZBar'
        ws.column_dimensions[utils.get_column_letter(3)].width = 20
        ws['D1'] = 'DBR'
        ws.column_dimensions[utils.get_column_letter(4)].width = 20
        ws['E1'] = 'ZXing'
        ws.column_dimensions[utils.get_column_letter(5)].width = 20
    return wb

設(shè)置值并更改工作表單元格的填充顏色：

red = PatternFill(start_color='FFFF0000',
                   end_color='FFFF0000',
                   fill_type='solid')
 
green = PatternFill(start_color='FF00FF00',
                   end_color='FF00FF00',
                   fill_type='solid')
 
def update_row(wb, row_index, filename=None, expected_results=None, zbar_results=None, dbr_results=None, ZXing_results=None):
    ws = wb.active
    row = ws[row_index]
    row[0].value = filename
    row[1].value = expected_results
    if zbar_results != None:
        row[2].value = zbar_results
        if zbar_results == expected_results:
            row[2].fill = green
        else:
            row[2].fill = red
 
    if dbr_results != None:
        row[3].value = dbr_results
        if dbr_results == expected_results:
            row[3].fill = green
        else:
            row[3].fill = red
 
    if ZXing_results != None:
        row[4].value = ZXing_results
        if ZXing_results == expected_results:
            row[4].fill = green
        else:
            row[4].fill = red

將工作簿保存到一個(gè).xlsx文件：

def save_workbook(wb, wb_name):
    if wb != None:
        wb.save(wb_name)

現(xiàn)在運(yùn)行Python應(yīng)用程序以生成基準(zhǔn)文件：

python app.py -d D:\python-zxing-zbar-dbr\dataset

本教程內(nèi)容就是這樣了，希望對您所有幫助！想要了解更多產(chǎn)品資訊請繼續(xù)關(guān)注我們慧都網(wǎng)，您可以下載Dynamsoft Barcode Reader試用版免費(fèi)評估~