Bar Code Inspection Parameters

Bar Code Inspection Parameters
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The Amplios Document Filer will inspect each document in the Ready to File folder of each folder set for a linear bar code. If a supported bar code is found when a document is processed, the information in the bar code is used to rename the file. You can accept the automatic renaming done by the program or you can use a Regular Expression to customize how you want your files named based on the bar code information. The documents being processed by the program can be original digital documents or they may be documents which have been scanned. Scanned documents can be hand written, dirty, torn, with varying degrees of print quality, and with other attributes that can reduce the success in finding or reading the bar code. These variations can make it difficult for the program to find the bar code and read it correctly. Normally the default selection of these parameters will give you excellent results but if the program is not successfully finding or reading your bar codes, you can make adjustments to these parameters to improve the results. You can have a separate set of parameter settings for each folder set.

If you do not understand any of these parameters, it is highly recommended that you do not change it.

You can always restore all the default parameter values by clicking on the Default button.

The value of the ConfidenceThreshold parameter tells the program how confident it should be about its decoding results before deeming them as successful. This value lives between 0.0 (very loose) and 1.0 (virtually unattainable). By default this threshold value is set to 0.81 (i.e. 81% confidence required in order to report any decoding result).

The value of the ContrastSensitivity parameter tells the program to only pay attention to areas of the image that score above that threshold value in terms of contrast and high spatial frequency energy. This parameter is a number between 0.0 and 1.0. The default value for this threshold is 0.07 (i.e. 7% of the input image's color range).

The value of the ThoroughMode parameter tells the program whether or not it should perform a more thorough search for potentially multiple bar codes within the images we send to it. If the parameter is set to "No", the control will operate in its "Fast" mode wherein it will look for the single most likely location where a bar code might be and attempt to read data from that location only. Note about Thorough Mode and Patch Codes: Even when it is set to operate in its Thorough Mode, the program will never report more than one PatchCode per image.

The maxNbCodes parameter can be used to speed up the system in Thorough Mode. You may speed up the process if you know in advance how many bar codes are contained within the image. This version of the program is only setup to look or one bar code in a document.

The ExpectedDpi parameter is used to tune the system to the image resolution you use in your application. Originally the system was targeting image resolutions in the 100 to 200 dpi. As it turns out many users are using this program to process images that were scanned at much higher resolution. The system doesn't need to know exactly what the image resolution is but you can help it do a better and faster job by providing a fair guess in that field.

The SearchGranularity parameter is primarily used to speed up the system. Although Amplios Document Filer doesn't do a traditional "scan-line" process, there is still a concept of search granularity when it first analyses the provided image in order to assess where potential barcodes might live. If you deal with large and high-resolution images, you can get away with a coarser granularity (i.e. larger number), which will subsequently speed up the process.