IsBlankImage function
Posted: Tue Dec 02, 2008 9:04 pm
The project I am working on requires the scanner to scan in duplex mode, but there will not always be double sided pages in the scanner. Therefore some blank images will be resulting.
I have been testing a single sided sheet of paper with the IsBlankImage function, yet this function always returns that the image is not blank.
Image 0 (not blank) - has a BPP of 1 and a noise level of 2.34354949
Image 1 (blank) - has a BPP of 1 and a noise level of 0.3512246446
My code is exactly like the example:
If VSTwain1.IsBlankImage(i, 0.01, currentNoise) = False Then '= false since true means blank (or should)
Where i is the index, .01 is the maxNoiseLevel as recommended by tthe documentation, and currentNoise is a variable of type Single.
The image scans in as solid white, perhaps is the software looking for Solid black to indicate blank?
According to the documentation the IsBlankImage function requires a BPP of 1 (and others), which my images have.
Is there something I am not doing that is causing this function to work improperly?
I have been testing a single sided sheet of paper with the IsBlankImage function, yet this function always returns that the image is not blank.
Image 0 (not blank) - has a BPP of 1 and a noise level of 2.34354949
Image 1 (blank) - has a BPP of 1 and a noise level of 0.3512246446
My code is exactly like the example:
If VSTwain1.IsBlankImage(i, 0.01, currentNoise) = False Then '= false since true means blank (or should)
Where i is the index, .01 is the maxNoiseLevel as recommended by tthe documentation, and currentNoise is a variable of type Single.
The image scans in as solid white, perhaps is the software looking for Solid black to indicate blank?
According to the documentation the IsBlankImage function requires a BPP of 1 (and others), which my images have.
Is there something I am not doing that is causing this function to work improperly?