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How to automatically deskew an image

Generally, there are two ways to automatically deskew an image.

Enable the capability of a scanner

Applicable only to compatible TWAIN scanners

There is a standard TWAIN capability called ICAP_AUTOMATICDESKEW which, when enabled, does the deskewing of all scanned images automatically. If your scanner supports this capability, you can enable the functionality through Dynamic Web TWAIN using the API IfAutomaticDeskew

DWObject.OpenSource();
DWObject.IfAutomaticDeskew = true;

Use Dynamic Web TWAIN to deskew an image as it is scanned

The function deskew() below is applicable to all platforms. The event OnPostTransferAsync is only triggered during scanning

function deskew(index) {
    DWObject.GetSkewAngle(
        index,
        function(angle) {
            console.log("skew angle: " + angle);
            DWObject.Rotate(index, angle, true,
                function() {
                    console.log("Successfully deskewed an image!");
                },
                function(errorCode, errorString) {
                    console.log(errorString);
                }
            );
        },
        function(errorCode, errorString) {
            console.log(errorString);
        }
    );
}
DWObject.RegisterEvent("OnPostTransferAsync", function(info) {
    deskew(DWObject.ImageIDToIndex(info.imageId));
});

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