Set up capturing

Set up capturing

This article describes how to use Configuration Manager in Nexus Card SDK to set up a variety of capture components.

You set up the capture objects (image, signature, document and fingerprint) and also the capture sources (live image camera, web camera, scanner, digital camera, clipboard, file, document…)

If any capture sources for image and/or signature capture have already been configured, they will be displayed in the Capture property in the Value / Setting column in Configuration Manager.

Settings for capture objects

  1. Start the Configuration Manager for Card SDK from the Start menu in Windows.

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Image Format

    • When this function is enabled, the default aspect ratio of 3:4 for photos and fingerprints, and 4:1 for signatures will be proposed. You can overwrite these values if you want to capture images in a different format. The aspect ratio settings are very important and must be matched with the layout design.

    • If this function is disabled, the image format will be determined by the system.

    • To override these settings and capture images in a different format:

      • Enable Scale Images if you want all cropped images to be saved in the same image size. Otherwise, images will be saved in the size defined by the selected image area.

      • Example: If the aspect ratio is 3:4, all resulting images will be saved in the size of 300 x 400 pixels. Note that by this, the images will be stretched and squashed (technically unavoidable), resulting in a loss of quality.

  3. Image Enhancement

    • Automatic Enhancement provides consistent image quality. Colour faults are automatically analyzed and corrected. Then the head of the captured subject is zoomed to the predefined size and positioned in the centre of the image.

    • Manual Enhancement. Various settings are available to improve the image quality (brightness, contrast, sharpness). This function is not available for signature capture.
      Select the checkbox next to the function you want to make available.

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Select image object Document.

  3. Selection of Bar Code / Text Section
    This option is reserved for specific application needs and should only be enabled in such cases.

Capturing a fingerprint results in an image and in the minutiae extracted from it. These are the feature points which are found in a fingerprint, and which describe it as uniquely as possible. Note that an additional software licence is required for minutiae extraction, which is not included in the standard system scope.

The data can be compressed, for example, to cope with the limited memory capacity of a chip. Note, however, that the bigger the allowed memory, the more detailed and unique is the description of the fingerprint.

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Select image object Fingerprint.

  3. Check Extraction Data Size Limitation to define the upper limit of the extracted data size.

Settings for capture sources

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Image.

  3. Check Live Image Camera.

  4. On the Camera tab, select a camera type and, if necessary, the suitable interface or driver. In case the Canon Digital Camera is selected, click Select... and choose a suitable model.
    For trouble-free operation of your Canon digital camera as a live image camera, make sure to disable Auto Power Down on your camera’s menu and to use a suitable power adapter.

    These camera types have been set up during installation.

  5. If a camera is connected, you can search for it and have it displayed. Click Find to search for a connected camera and the interface used. This will automatically detect the camera connected to your system. The camera will only be detected if the drivers that came with the camera have been installed correctly.

    A Canon digital camera or a webcam is always searched for first. If both cameras are connected, the search for a Canon digital camera has priority. If other camera types are connected, these are not accounted for.

  6. Test the camera to make sure it is properly connected, and the suitable interface has been selected. The test result will be displayed in a message box. If the test is not successful, check whether the camera is switched on, and if it is connected to the PC and the power adapter. This feature will be enabled or disabled, depending on the type of camera used.

  7. Click Settings... to make additional settings for live cameras ID-CAM S, FCB, Vision 45, Vision 480 and CCD 7000:

  8. Click Settings... to make additional settings for Canon EOS Digital Camera:

  9. Click Settings... to make additional settings for Canon Powershot digital camera:

     

  10. Click Settings... to make additional settings for Web camera (dialog box may vary depending on the webcam installed):

     

  11. On the Video Grabber tab, select a suitable video board from the drop-down menu. If a webcam or a Canon digital camera was selected as camera type, this tab will not be available.

  12. Check Hardware Acceleration Enabled to have a special accelerated presentation of the live image. This option is not supported by all graphics cards and their drivers.

Scanners and digital cameras are connected via a TWAIN software interface. Your device must come with a TWAIN compatible driver. To enable operation of a TWAIN device, the manufacturer provides a dialog box with the driver. This TWAIN dialog box can be called from the Image Capture dialog box.

The appearance of this dialog box may vary and it may provide different functions depending on the type of device used and the manufacturer involved. For details, refer to your device manual. However, the TWAIN dialog at least enables you to scan an image using a scanner, or to capture an image using a digital camera, and then display it in the Image Capture dialog box.

Scanner via TWAIN

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Image.

  3. Check Scanner via TWAIN.

  4. Select one of the connected devices.

  5. Check TWAIN Dialog if you want the dialog box to open whenever you start scanning.

  6. If TWAIN Dialog is unchecked, you can alternatively define a scan area. The possibility of directly reading in images without using the TWAIN dialog also depends on the used device and TWAIN driver though. Not all drivers are supporting this procedure.

Digital camera via TWAIN

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Image.

  3. Check Digital Camera via TWAIN.

  4. Select one of the connected devices.

  5. It is recommended to check TWAIN Dialog. If TWAIN Dialog is unchecked, the procedure of reading image objects (Image, Signature) depends on the type of camera you are using. The reading procedure is not exactly defined: some cameras will capture a new image, others will provide the first image from the digital camera’s memory.

You can select and edit images stored in a directory.

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Image.

  3. Check File.

  4. Select a Default Filter. Only the files that match the selected filter will be displayed to the user. Select one of these:

    • All Files to display all file types

    • All Image Files to display all files saved in an image format (for example, .tif, .jpg, ...)

    • One of the specified image formats to display only files of this type.

  5. Select a Default Directory to be displayed when invoking the Image Capture (Source: File) dialog box for the first time.

    • Click ... and select the directory you want in the Directory Selection dialog box.

  6. Check User may change the filter and directory to grant the user access to all of the data and existing filters.

    This option is enabled by default, granting the user full access to all files and filters available. If the user changes the default settings, the last selected settings will always be displayed when invoking the Image Capture (Source: File) dialog box. If this option is unchecked, these areas are hidden or shown as read only fields. Consequently, the user cannot change the default settings.

Reading images from file is also a suitable method for image capture when using scanners that store the scanned images in a virtual directory of your computer.

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Image.

  3. Check File.

  4. In the Default Directory box, enter the directory to which your scanner should automatically save the scanned image. For more detailed information, please see your scanner’s manual.

  5. Uncheck User may change the filter and directory.

  6. For optimum performance, follow these steps:

    1. Read in the image via the scanner’s user interface.

    2. Open the Image Capture (Source: File) dialog box.

    3. Since the virtual directory always contains only one image, the image is instantly displayed on the Selection Frame tab.

Settings for particular capture devices 

Supported and tested device from StepOver is the "duraSign Pad Brilliance" model. Other models may also work as they use the same driver. Special features of the duraSign Pad Brilliance are the hardened glass surface and the customizable surface background. Software interface is the StepOver TWAIN driver. For more information, see https://www.stepover.com/

  1. Nexus recommends to use the StepOver driver version sopad_twain-with-driver_180309.exe. To download it, use this link.

Typical configuration

This configuration reduces the required manual clicks. Cropping of the signature is done manually, always remembering the recently used position (which is the usual behavior of the Card SDK's capturing).

  1. In Configuration Manager, open Capture. The Capture Setup dialog box opens.

  2. Click on the + sign next to Signature.

  3. Check Signature Pad (TWAIN).

  4. Select StepOver Signature Scanner from the Device drop-down menu.

  5. Uncheck TWAIN Dialog.

  6. Under Settings, enter Width 108 mm and Height 65 mm.

  7. Option: Check Start Capturing automatically to activate automatic capturing.

Advanced configuration

This configuration also reduces manual clicks to a minimum, only showing a dialog from the signature pad driver. But this configuration only allows using this signature pad as single source (and not Live Image camera, Scanner via TWAIN and so on). It captures the signature from the bottom of the pad surface, using the Card SDK's default aspect ratio for signatures (which is 4:1). The captured area corresponds to the intended writing area of the pad's default background (see the picture of the pad below).

  1. Follow steps 1 to 6 under "Typical configuration"

  2. Check Show only the TWAIN Dialog of the device driver.

Making this signature:

Creates this captured image file (frame is only indicated to show the extension):

The signature pad shows a background in stand-by mode and when signing. To change them, use StepOver's ImageLoader application.

  1. Click this link to download the ImageLoader software.

  2. Click these links for general information and for use of ImageLoader.

  3. The driver of the signature pad removes an exchanged signing image. To prevent this, use the following registry key:

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