java - twain scanner partially scan -

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i use twain 2.1 connecting scanner. how can set scanner scan part of page without displaying preview page of scanner. used source.setregionofinterest method, doesn't finish scanning , scanner can not used until restarted.

the area of image acquired rectangle called frame. there may 1 or more frames located on page. tw_frame structure specifies values left, right, top, , bottom of frame acquired.


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