VintaSoft Imaging .NET SDK and Plug-ins Discussions

Hello Klaus,

Please do the following test:

• Run our Forms Processing Demo.
• Select "Template matching => Image imprint generator preprocessing..." menu, dialog for preprocesing of image imprint generator" will appear.
• Check the "Enable image processing" checkbox, add "Dilate filter" to the commands, which must be applied to processing image, and press the "Ok" button.
• Try to process OMR form and see the result.

Best regards, Alexander

Hello Klaus,

You need to set the image processing command in key zone recognizer if you want to preprocess image before form recognition. This can be done using the KeyZoneRecognizerCommand.ImagePreprocessing property.

VintaSoft Imaging .NET SDK contains the FormsProcessingConsoleDemo console project, which demonstrates how to recognize filled form using template form or align image according to the template image in .NET.

Please see source codes of this project.

Program.cs file has the CreateImageImprintGenerator method with the following code:

        private static ImageImprintGeneratorCommand CreateImageImprintGenerator(string imprintGeneratorType)
        {
            // select image imprint generator type 
            switch (imprintGeneratorType)
            {
                case "Line":
                case "":
                    return new ImageImprintGeneratorCommand(new KeyLineRecognizerCommand());

                case "Lpattern":
                    return new ImageImprintGeneratorCommand(new KeyMarkRecognizerCommand());

                case "All":
                    KeyZoneRecognizerCommand[] command = new KeyZoneRecognizerCommand[] { new KeyLineRecognizerCommand(), new KeyMarkRecognizerCommand() };
                    return new ImageImprintGeneratorCommand(command);

                default:
                    Console.WriteLine("Unknown imprint generator type. Using default type: Line.");
                    return new ImageImprintGeneratorCommand(new KeyLineRecognizerCommand());
            }
        }

For preprocessing of source image before key zone recognition you need to modify code of CreateImageImprintGenerator method to the following code:

        private static ImageImprintGeneratorCommand CreateImageImprintGenerator(string imprintGeneratorType)
        {
            // select image imprint generator type 
            switch (imprintGeneratorType)
            {
                case "Line":
                case "":
                    KeyLineRecognizerCommand keyLineRecognizerCommand = new KeyLineRecognizerCommand();
                    keyLineRecognizerCommand.ImagePreprocessing = new DilateCommand();
                    return new ImageImprintGeneratorCommand(keyLineRecognizerCommand);

                case "Lpattern":
                    return new ImageImprintGeneratorCommand(new KeyMarkRecognizerCommand());

                case "All":
                    KeyZoneRecognizerCommand[] command = new KeyZoneRecognizerCommand[] { new KeyLineRecognizerCommand(), new KeyMarkRecognizerCommand() };
                    return new ImageImprintGeneratorCommand(command);

                default:
                    Console.WriteLine("Unknown imprint generator type. Using default type: Line.");
                    return new ImageImprintGeneratorCommand(new KeyLineRecognizerCommand());
            }
        }

Best regards, Alexander

Hi Alex,

that helpt and the Dilate Command is running as expected. Thanks for that.
But: how to add a second/third preprocess command, such as despeckle or the whole ocrpreprocess command.
I couldn't find an 'Add-method' for the 'keyLineRecognizerCommand.ImagePreprocessing', only new.

Regards
Klaus.

Hi Klaus,

that helpt and the Dilate Command is running as expected. Thanks for that.
But: how to add a second/third preprocess command, such as despeckle or the whole ocrpreprocess command.
I couldn't find an 'Add-method' for the 'keyLineRecognizerCommand.ImagePreprocessing', only new.

Sorry for delay. If you need fast response to your question, please send your question to our support at support@vintasoft.com.

You need to use the CompositeCommand class (https://www.vintasoft.com/docs/vsimagin ... mmand.html) if you want to combine several image processing commands.

For using several image processing commands (dilate and despeckle) before key zone recognition you need to modify code of CreateImageImprintGenerator method to the following code:

        private static ImageImprintGeneratorCommand CreateImageImprintGenerator(string imprintGeneratorType)
        {
            // select image imprint generator type 
            switch (imprintGeneratorType)
            {
                case "Line":
                case "":
                    Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase[] commands =
                         new Vintasoft.Imaging.ImageProcessing.ProcessingCommandBase[] {
                         new Vintasoft.Imaging.ImageProcessing.Filters.DilateCommand(),
                         new Vintasoft.Imaging.ImageProcessing.Document.DespeckleCommand()
                    };
                    KeyLineRecognizerCommand keyLineRecognizerCommand = new KeyLineRecognizerCommand();
                    keyLineRecognizerCommand.ImagePreprocessing = new Vintasoft.Imaging.ImageProcessing.CompositeCommand(commands);
                    return new ImageImprintGeneratorCommand(keyLineRecognizerCommand);

                case "Lpattern":
                    return new ImageImprintGeneratorCommand(new KeyMarkRecognizerCommand());

                case "All":
                    KeyZoneRecognizerCommand[] command = new KeyZoneRecognizerCommand[] { new KeyLineRecognizerCommand(), new KeyMarkRecognizerCommand() };
                    return new ImageImprintGeneratorCommand(command);

                default:
                    Console.WriteLine("Unknown imprint generator type. Using default type: Line.");
                    return new ImageImprintGeneratorCommand(new KeyLineRecognizerCommand());
            }
        }

Best regards, Alexander