Set Kofax Image Filter Properties - CAPTUREit - Foundation 23.1 - Foundation 23.1 - AnyDoc - external

CAPTUREit
Platform
AnyDoc
Product
CAPTUREit
Release
Foundation 23.1
License

Image filters can be used to enhance line edges, smooth characters and remove background noise on an image. For example, if the character edges on an image appear to be choppy and surrounded by extraneous noise, you can use the Character Smoothing filter to remove some of the noise and smooth the characters. This increases OCR accuracy and reduces the compressed file size.

For best results, follow these guidelines:

  • The combination of deshading, despeckling, removing lines and using the Smooth and Clean image filter produces better results than just using the Smooth and Clean image filter. However, the Smooth and Clean filter should not be used as an alternative to deshading, despeckling and removing lines from an image.

  • The combination of deshading, despeckling and using the Smooth, Clean and Preserve h&v lines filter produces better results than using the Smooth, Clean + Preserve h&v lines filter. The Smooth, Clean, + Preserve h&v lines filter should not be used as an alternative to deshading and despeckling an image.

  1. From the Configure Scanner Settings | Kofax Options tab, click Image Filter. The Image Filter Properties window appears.
  2. To activate the selected image filter, select the Enable check box and select the filter to apply. The available filters are as follows:

    Filter

    Description

    Character Smoothing

    This filter smoothes characters and lines. This filter considers the color of the four perpendicular pixels (strong neighbors) of every pixel in the source image. If the majority of the strong neighbors have the color opposite from the pixel's color, the color of the pixel is toggled to match that of its neighbors. Character Smoothing always has a positive affect on an image. You can use this filter in combination with any other image filter.

    Thinning Filter

    This filter thins characters and lines and may remove background noise. This erosion filter thins down image elements by setting any black pixel to white if it is perpendicular or diagonally adjacent to at least one white pixel in the source image. Thinning should only be applied to images that contain elements that are ballooned or blended together. Applying this filter to an image that does not contain such elements may cause the loss of important data.

    Thicken Filter

    This filter thickens characters and lines and may exaggerate background noise. This dilation filter thickens image elements by setting any white pixel to black if it is perpendicular or diagonally adjacent to at least one black pixel in the source image. Thicken should only be applied to images that have been deshaded and despeckled and that contain thin or light elements.

    Smooth and Clean

    This filter smoothes characters, removes background noise and may eliminate lines. This filter is faster than using the Thinning filter followed by a Light Thicken, but has exactly the same effect. It sets any black pixel to white if it cannot be considered part of at least a 2x2 block of black pixels in the source image.

    Fill Line Breaks

    This filter fills in and smoothes lines. This closing filter sets any pixel to black if it cannot be considered part of at least a 2x2 block of white pixels in the source image. It may cause parallel lines that are close together to be merged.

    Smooth, Clean + preserve h&v lines

    This filter smoothes characters and lines and removes background noise. This filter is identical to the Smooth and Clean filter except that it preserves horizontal and vertical black line segments that are one pixel wide.

    Fill Line Breaks + preserver h&v lines

    This filter fills in and smooths lines while maintaining the interline gap. This filter is identical to the Fill Line Breaks filter except that it preserves horizontal and vertical white line segments that are at least one pixel wide. Use with images that contain lines that are close together, such as lines that are separated by only one pixel.

    Light Thicken Filter

    This filter thickens characters and lines and may exaggerate background noise, but is not as aggressive as the Thicken filter. Light Thicken should only be applied to images that have been deshaded and despeckled.

    Outline

    This filter extracts an outline of all image elements. This specialty filter might be useful for certain applications, such as desktop publishing applications.