This function processes several images for the same task and results in a multi-page document. For instance, upload pages of the book individually via submitImage to the same task. And then process it via ProcessDocument to get a multi-page pdf.
processDocument(taskId = NULL, language = "English",
  profile = c("documentConversion", "documentArchiving",
  "textExtraction", "fieldLevelRecognition", "barcodeRecognition"),
  textType = c("normal", "typewriter", "matrix", "index", "ocrA", "ocrB",
  "e13b", "cmc7", "gothic"), imageSource = c("auto", "photo", "scanner"),
  correctOrientation = c("true", "false"), correctSkew = c("true",
  "false"), readBarcodes = c("false", "true"), exportFormat = c("txt",
  "txtUnstructured", "rtf", "docx", "xlsx", "pptx", "pdfSearchable",
  "pdfTextAndImages", "pdfa", "xml", "xmlForCorrectedImage", "alto"),
  description = NULL, pdfPassword = NULL, ...)Only tasks with Submitted, Completed or NotEnoughCredits status can be processed using this function.
String. Optional; default: English
String. Optional; default: documentConversion
Options: documentConversion, documentArchiving, textExtraction, fieldLevelRecognition, barcodeRecognition
String. Optional; default: normal
Options: normal, typewriter, matrix, index, ocrA,ocrB, e13b,cmc7, gothic
String. Optional; default: auto
Options: auto, photo, scanner
String. Optional; default: true. 
Options: true or false
String. Optional; default: true.
Options: true or false
Optional; 
Options: true or false
optional, default: txt 
options: txt, txtUnstructured, rtf, docx, xlsx, pptx, pdfSearchable, pdfTextAndImages, pdfa, xml, xmlForCorrectedImage, alto
Optional; default: ""
Optional; default: NULL
Additional arguments passed to abbyy_GET.
data.frame with details of the task associated with the submitted Document
http://ocrsdk.com/documentation/apireference/processDocument/
# NOT RUN {
processDocument(taskId = "task_id")
# }
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