Exemplo n.º 1
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    def find_columns(self):
        """Get columns in a section of the image
        """

        portion = iulib.bytearray()
        iulib.extract_subimage(portion, self.inverted, 0, 0,
                self.inverted.dim(0), self.topptr)
        projection = high_pass_median(iulib.numpy(portion).sum(axis=1), 0.20)
        posscols = self.get_possible_columns(projection)
        bestcols = self.filter_columns(posscols, int(self._params.get("columns", 1)))
        self.columns.extend(bestcols)
Exemplo n.º 2
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    def find_columns(self):
        """Get columns in a section of the image
        """

        portion = iulib.bytearray()
        iulib.extract_subimage(portion, self.inverted, 0, 0,
                               self.inverted.dim(0), self.topptr)
        projection = high_pass_median(iulib.numpy(portion).sum(axis=1), 0.20)
        posscols = self.get_possible_columns(projection)
        bestcols = self.filter_columns(posscols,
                                       int(self._params.get("columns", 1)))
        self.columns.extend(bestcols)
Exemplo n.º 3
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def remove_border(narray, average_char_height):
    """Try and remove anything that's in a likely
    border region and return the subimage."""
    na = iulib.numpy(narray)
    hpr = na.sum(axis=0)
    vpr = na.sum(axis=1)
    hhp = high_pass_median(hpr, 5.0 / average_char_height)
    vhp = high_pass_median(vpr, 5.0 / average_char_height)

    vidx = vhp.nonzero()[0]
    hidx = hhp.nonzero()[0]

    b = iulib.bytearray()
    iulib.extract_subimage(b, narray, int(vidx[0]), int(hidx[0]),
            int(vidx[-1]), int(hidx[-1]))
    return b
Exemplo n.º 4
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def remove_border(narray, average_char_height):
    """Try and remove anything that's in a likely
    border region and return the subimage."""
    na = iulib.numpy(narray)
    hpr = na.sum(axis=0)
    vpr = na.sum(axis=1)
    hhp = high_pass_median(hpr, 5.0 / average_char_height)
    vhp = high_pass_median(vpr, 5.0 / average_char_height)

    vidx = vhp.nonzero()[0]
    hidx = hhp.nonzero()[0]

    b = iulib.bytearray()
    iulib.extract_subimage(b, narray, int(vidx[0]), int(hidx[0]),
                           int(vidx[-1]), int(hidx[-1]))
    return b
Exemplo n.º 5
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def get_lines_by_projection(narray, highpass=0.001):
    """Extract regions of blackness."""
    hpr = iulib.numpy(narray).sum(axis=0)
    hps = high_pass_max(hpr, highpass)

    regions = []
    gotline = None
    count = 0
    for val in hps:
        if val != 0:
            if gotline is None:
                gotline = count
        else:
            if not gotline is None:
                regions.append((gotline, count))
                gotline = None
        count += 1
    return regions
Exemplo n.º 6
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def get_lines_by_projection(narray, highpass=0.001):
    """Extract regions of blackness."""
    hpr = iulib.numpy(narray).sum(axis=0)
    hps = high_pass_max(hpr, highpass)

    regions = []
    gotline = None
    count = 0
    for val in hps:
        if val != 0:
            if gotline is None:
                gotline = count
        else:
            if not gotline is None:
                regions.append((gotline, count))
                gotline = None
        count += 1
    return regions
Exemplo n.º 7
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def get_horizontal_projection(narray):
    """Accumulate image rows."""
    return iulib.numpy(narray).sum(axis=0)
Exemplo n.º 8
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def get_vertical_projection(narray):
    """Accumulate image columns."""
    return iulib.numpy(narray).sum(axis=1)
Exemplo n.º 9
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def get_horizontal_projection(narray):
    """Accumulate image rows."""
    return iulib.numpy(narray).sum(axis=0)
Exemplo n.º 10
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def get_vertical_projection(narray):
    """Accumulate image columns."""
    return iulib.numpy(narray).sum(axis=1)