python twain 扫描

概述defmultiScan(self):"""ScanandreturnanarrayofPILobjectsIfnoimages,willreturnanemptyarray"""self.scanner.RequestAcquire(0,1)images=[]handles=[]try:handle,m

def multiScan(self):    """ Scan and return an array of PIL objects         If no images, will return an empty array    """    self.scanner.RequestAcquire(0, 1)    images = []    handles = []    try:        handle, more = self.scanner.XferImageNatively()        handles.append(handle)    except twain.excDSTransferCancelled:        return []    while more != 0:        try:            handle, more = self.scanner.XferImageNatively()            handles.append(handle)        except twain.excDSTransferCancelled:            more = 0    for handle in handles:        images.append(Image.open(StringIO(twain.DIBToBMfile(handle))))        twain.GlobalHandleFree(handle)    return images

 

import twainsm = twain.sourceManager(0)ss = sm.OpenSource()for i in range(3):  //for ex. 3 documents in the scanner device   ss.RequestAcquire(0,0)   rv = ss.XferImageNatively()   if rv:       (handle, count) = rv       twain.DIBToBMfile(handle, '{i}.bmp'.format(i))

 

import twainsm = twain.sourceManager(0)sm.SetCallback(onTwainEvent)ss = sm.OpenSource()index = 0for i in range(3):  //for ex. 3 documents in the scanner device   ss.RequestAcquire(0,0)def onTwainEvent(event):    if event == twain.MSG_XFERREADY:        saveImage()def saveImage():    rv = ss.XferImageNatively()    if rv:        (handle, count) = rv        twain.DIBToBMfile(handle, '{index}.bmp'.format(index))        index += 1

 

import twain sm = twain.sourceManager(0) ss = sm.OpenSource() ss.RequestAcquire(0,0) rv = ss.XferImageNatively() if rv: (handle, count) = rv twain.DIBToBMfile(handle, 'image.bmp')

 1、降低扫描分辨率、能用灰度就不用彩色、能用24位彩色就不用32位彩色

2、使用自动进纸器
3、采用高压缩比的图像格式，能用jpg就不用tiff，能用tiff就不用bmp
Source.GetCapabilityDefault(CapabilityCode)
Source.GetCapability(CapabilityCode)
Source.GetCapabilityCurrent(CapabilityCode)
Source.SetCapability(CapabilityCode)
Source.resetCapability(CapabilityCode)
Source.GetimageInfo()：返回XResolution, YResolution, ImageWIDth, ImageLength, SamplesPerPixel, BitsPerSample, BitsPerPixel, Planar, PixelType, Compression
Source.GetimageLayout()：返回((left, top, right, bottom) document_number, page_number, frame_number)

One of the CAP_* (Generic CapabilitIEs), ICAP_ (Image CapabilitIEs)

 

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