SetRectangle: Focus the OCR on a Sub-Region of the Image
| SetRectangle | R Documentation |
Focus the OCR on a Sub-Region of the Image
Description
SetRectangle restricts the OCR to a sub-rectangle of the
original image. After calling SetRectangle, the next
recognition done by the tesseract instance will only look at that
region. This is useful when one knows a priori that only a subset
of the image is of interest.
Usage
SetRectangle(api, ..., dims = sapply(list(...), as.integer))
Arguments
api |
an instance of the |
... |
the specification of the rectangle as left, top, width and height. |
dims |
an alternative mechanism for specifying the location of
the corners of the rectangle as a single object, a vector of integer
values. The elements identify the left, top, width and height of the
rectangle
This should NOT be the coordinates
of the top-left and bottom-right of the rectangle, i.e. |
Value
NULL. The function is used for its side-effect on the tesseract instance.
Author(s)
Duncan Temple Lang
References
See Also
tesseract, Recognize,
GetText
Examples
f = system.file("images", "1990_p44.png", package = "Rtesseract")
ts = tesseract(f)
dims = GetImageDims(ts)
# region chosen interactively
SetRectangle(ts, 500, 800, 1300, 800)
GetText(ts)
