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Flatbed A4 device with deskew & crop capabilities

Forums › TWAIN Classic › Flatbed A4 device with deskew & crop capabilities

  • This topic has 2 replies, 3 voices, and was last updated 11 years ago by Thierry.
Viewing 3 posts - 1 through 3 (of 3 total)
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  • November 19, 2009 at 6:08 pm #22559 Reply
    jandriver
    Participant
    • Topics - 2
    • Replies - 1
    • Total Posts - 3

    Hi everybody.

    We are looking for a flatbed A4 scanner with those capabilities, but at the moment we haven’t found anyone.

    Is that usual? do you know anyone?

    If not, how do you programme those functionalities in your applications? do you use any image treatment libraries? Our target application is developed in Java.

    Thanks in advance.

    November 25, 2009 at 8:50 pm #25089 Reply
    Kaij
    Participant
    • Topics - 9
    • Replies - 132
    • Total Posts - 141

    I just can recall a ADF scanner which has deskew and autocrop in the TWAIN driver.

    Of course you can do that also inside a scan application.

    Best regards,

    Kaij

    January 19, 2010 at 3:17 pm #25090 Reply
    Thierry
    Participant
    • Topics - 6
    • Replies - 54
    • Total Posts - 60

    @jandriver wrote:

    Hi everybody.

    We are looking for a flatbed A4 scanner with those capabilities, but at the moment we haven’t found anyone.

    Is that usual? do you know anyone?

    If not, how do you programme those functionalities in your applications? do you use any image treatment libraries? Our target application is developed in Java.

    Thanks in advance.

    My Agfa scanner (e42 with a black background) has this function in the TWAIN driver, not sure it is exposed as a capability. Usually flatbeds scanners have limited capability concerning deskew and auto-crop, because it is based on the image itself, any application can do that. In the feeder you can have additional sensors to help you, and it is more efficient and useful.

    This functionality is based on extraction of the border of the image assuming that the foreground is black, and the border of the image is white. Extracting all the borders points (transition from black to white) gives you 4 lines approximated (to have a minimal distance between the approximated line and the points). Then you have to choose two skews (top or bottom and left or right, or a mean value …) and rotate the image, then crop.

    You should find many papers to implement this function whit a lot a of different approaches.

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Viewing 3 posts - 1 through 3 (of 3 total)
Reply To: Flatbed A4 device with deskew & crop capabilities
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