Smarter text detection that ignores text in margins

def _page_has_text(text_blocks, page_width, page_height):
    """Smarter text detection that ignores text in margins"""

    pw, ph = float(page_width), float(page_height)

    margin_ratio = 0.125
    interior_bbox = (
        margin_ratio * pw,  # left
        (1 - margin_ratio) * ph,  # top
        (1 - margin_ratio) * pw,  # right
        margin_ratio * ph,  # bottom  (first quadrant: bottom < top)
    )

    def rects_intersect(a, b):
        """
        Where (a,b) are 4-tuple rects (left-0, top-1, right-2, bottom-3)
        https://stackoverflow.com/questions/306316/determine-if-two-rectangles-overlap-each-other
        Formula assumes all boxes are in first quadrant
        """
        return a[0] < b[2] and a[2] > b[0] and a[1] > b[3] and a[3] < b[1]

    has_text = False
    for bbox in text_blocks:
        if rects_intersect(bbox, interior_bbox):
            has_text = True
            break
    return has_text