彩票走势图

Dynamsoft Barcode Reader SDK一款多功能的条码读取控件，只需要几行代码就可以将条码读取功能嵌入到Web或桌面应用程序。这可以节省数月的开发时间和成本。能支持多种图像文件格式以及从摄像机或扫描仪获取的DIB格式。使用Dynamsoft Barcode Reader SDK，你可以创建强大且实用的条形码扫描仪软件，以满足你的业务需求。

点击下载Dynamsoft Barcode Reader最新版

许多企业喜欢使用Dynamsoft Barcode Reader SDK，因为它具有灵活的参数配置和强大的对多个条形码的解码能力。在本文中，让我们看一下条形码SDK模板以及从开发人员的角度优化解码性能的可能方法。

如何配置用于解码性能的模板

如果您从未尝试过Dynamsoft Barcode Reader SDK，则可以在在线条形码游乐场玩耍，只需更改模式即可直接比较性能差异。

此外，如果您是专家，则可以单击高级设置自行调整一系列参数。

为了方便开发人员，我向Github上传了五个有用的模板文件：

• Speed.json
• Balanced.json
• Coverage.json
• Morecoverage.json
• Mostcoverage.json

这是我的测试图像：

我们来看一下使用不同模板的检测准确性和时间成本：

BarcodeReader.exe AllSupportedBarcodeTypes.png  license.txt  speed.json   
Total barcode(s) found: 12. Time cost: 63 ms

BarcodeReader.exe AllSupportedBarcodeTypes.png  license.txt   balanced.json
Total barcode(s) found: 13. Time cost: 140 ms
 
BarcodeReader.exe AllSupportedBarcodeTypes.png  license.txt   coverage.json
Total barcode(s) found: 13. Time cost: 844 ms
 
BarcodeReader.exe AllSupportedBarcodeTypes.png  license.txt   morecoverage.json
Total barcode(s) found: 13. Time cost: 1610 ms
 
BarcodeReader.exe AllSupportedBarcodeTypes.png  license.txt   mostcoverage.json
Total barcode(s) found: 13. Time cost: 3156 ms

使用多线程可以加快多条形码解码的性能吗？

按照我们的常识，解码单个条形码的时间成本应小于解码多个条形码的时间成本。因此，读取多个条形码的一种可能的优化方法是创建多个工作线程，以同时处理不同的条形码符号。

这是用于顺序解码一维和二维条形码的代码：

barcode_decoding(buffer, size, BF_CODE_39, 1, license, config);
barcode_decoding(buffer, size, BF_QR_CODE, 1, license, config);
barcode_decoding(buffer, size, BF_PDF417, 1, license, config);
barcode_decoding(buffer, size, BF_DATAMATRIX, 1, license, config);

Thread id: 22536. Type: CODE_39
Thread id: 22536. Total barcode(s) found: 1. Time cost: 235 ms
 
Thread id: 22536. Type: QR_CODE
Thread id: 22536. Total barcode(s) found: 1. Time cost: 47 ms
 
Thread id: 22536. Type: PDF417
Thread id: 22536. Total barcode(s) found: 1. Time cost: 62 ms
 
Thread id: 22536. Type: DATAMATRIX
Thread id: 22536. Total barcode(s) found: 1. Time cost: 63 ms

int starttime = gettime();
thread t1(barcode_decoding, buffer, size, BF_CODE_39, 1, license, config); 
thread t2(barcode_decoding, buffer, size, BF_QR_CODE, 1, license, config);
thread t3(barcode_decoding, buffer, size, BF_PDF417, 1, license, config);
thread t4(barcode_decoding, buffer, size, BF_DATAMATRIX, 1, license, config);
t1.join();
t2.join();
t3.join();
t4.join();
int endtime = gettime();
printf("Thread time cost: %d ms\n\n", (endtime - starttime));

Thread id: 24024. Type: QR_CODE
Thread id: 24024. Total barcode(s) found: 1. Time cost: 78 ms
 
Thread id: 17384. Type: DATAMATRIX
Thread id: 17384. Total barcode(s) found: 1. Time cost: 78 ms
 
Thread id: 24264. Type: PDF417
Thread id: 24264. Total barcode(s) found: 1. Time cost: 94 ms
 
Thread id: 4060. Type: CODE_39
Thread id: 4060. Total barcode(s) found: 1. Time cost: 265 ms
 
Thread time cost: 265 ms

barcode_decoding(buffer, size, BF_CODE_39 | BF_DATAMATRIX | BF_QR_CODE | BF_PDF417, 1, license, config);

Thread id: 20308. Type: PDF417
Thread id: 20308. Type: QR_CODE
Thread id: 20308. Type: DATAMATRIX
Thread id: 20308. Type: CODE_39
Thread id: 20308. Total barcode(s) found: 4. Time cost: 250 ms

您可能已经注意到，有一个名为maxAlgorithmThreadCount的参数。我们可以通过增加线程数来提高SDK性能吗？

我根据硬件线程做了一个简单的测试：

const auto processor_count = std::thread::hardware_concurrency();
int minimum_count = 1, minimum_timecost = 0;
    for (int i = 0; i < processor_count; i++) 
    {
        printf("Thread count: %d. ", i + 1);
        int timecost = barcode_decoding(buffer, size, formats, i, license, config);
        if (i == 0) 
        {
            minimum_count = 1; 
            if (timecost > 0)
            {
                minimum_timecost = timecost; 
            }
        }
        else {
            if (timecost < minimum_timecost)
            {
                minimum_count = i + 1;
                minimum_timecost = timecost; 
            }
        }
    }
    printf("Multi-thread best performance: thread_count = %d, timecost = %d \n\n", minimum_count, minimum_timecost);

Thread count: 1. Thread id: 26376. Total barcode(s) found: 13. Time cost: 141 ms
 
Thread count: 2. Thread id: 26376. Total barcode(s) found: 13. Time cost: 141 ms
 
Thread count: 3. Thread id: 26376. Total barcode(s) found: 13. Time cost: 125 ms
 
Thread count: 4. Thread id: 26376. Total barcode(s) found: 13. Time cost: 140 ms
 
Thread count: 5. Thread id: 26376. Total barcode(s) found: 13. Time cost: 157 ms
 
Thread count: 6. Thread id: 26376. Total barcode(s) found: 13. Time cost: 203 ms
 
Thread count: 7. Thread id: 26376. Total barcode(s) found: 13. Time cost: 156 ms
 
Thread count: 8. Thread id: 26376. Total barcode(s) found: 13. Time cost: 140 ms
 
Multi-thread best performance: thread_count = 3, timecost = 125