halcon案例text_line_orientation

隶属于：
C:\Users\Public\Documents\MVTec\HALCON-23.05-Progress\examples\hdevelop\OCR\Segmentation

此例，主要是点状字符的提取。一个有角度的字符，通过text_line_orientation获取字符角度，再旋转图片，图像Blob分析得到字符区域并显示。

读图

原图转正

进行点图处理
灰度值拉伸

二值化初步提取字符区域

再进一步提取字符区域

将字符扩大，选出真正的字符区域

得到单个字符的外接区域

膨胀得到字符外界区域

求矩形和点状区域
显示。
显示可借鉴:颜色这么传入即可
dev_set_color ([‘green’, ‘cyan’])
dev_display (RegionDots)

dev_update_off ()
dev_close_window ()
dev_open_window (0, 0, 400, 300, 'black', WindowHandle)
set_display_font (WindowHandle, 14, 'mono', 'true', 'false')
dev_set_draw ('margin')
dev_set_line_width (2)
for J := 1 to 5 by 1
    read_image (Image, 'dot_print_rotated/dot_print_rotated_' + J$'02d')
    text_line_orientation (Image, Image, 48, rad(-30), rad(30), OrientationAngle)
    rotate_image (Image, ImageRotate, -OrientationAngle / rad(180) * 180, 'constant')
    dots_image (ImageRotate, ImageDots, 3, 'dark', 2)
    scale_image_max (ImageDots, ImageScaleMax)
    intensity (ImageRotate, ImageRotate, Mean, Deviation)
    threshold (ImageScaleMax, RegionThresh, Mean - 35, 255)
    connection (RegionThresh, ConnectedDots)
    select_shape (ConnectedDots, SelectedDots, 'area', 'and', 8, 1000)
    opening_circle (SelectedDots, SelectedDotsOpening, 1.5)
    union1 (SelectedDotsOpening, Region)
    closing_circle (Region, RegionClosing, 9.5)
    connection (RegionClosing, ConnectedRegions)
    * 连接分割的部分。

    smallest_rectangle1 (ConnectedRegions, Row11, Column11, Row21, Column21)
    gen_rectangle1 (Rectangle1, Row11, Column11, Row21, Column21)
    union1 (Rectangle1, RegionUnion3)
    connection (RegionUnion3, ConnectedRegions2)
    select_shape (ConnectedRegions2, SelectedRegions, ['area', 'height', 'width'], \
                  'and', [1000, 30, 20], [3200, 70, 70])
    * 获取矩形形状。

    smallest_rectangle1 (SelectedRegions, Row1, Column1, Row2, Column2)
    gen_rectangle1 (RectangularShape, Row1, Column1, Row2, Column2)
    *构建线条
    union1 (SelectedRegions, RegionUnion)
    dilation_rectangle1 (RegionUnion, RegionDilation, 50, 1)
    connection (RegionDilation, ConnectedLines)
    select_shape (ConnectedLines, SelectedLines, 'area', 'and', 10000, 99999)
    * 线条的元素。
    intersection (SelectedLines, RectangularShape, ElementOfLines)
    intersection (ElementOfLines, SelectedDotsOpening, RegionDots)
    dev_clear_window ()
    dev_display (ImageRotate)
    dev_set_color ('gray')
    dev_display (ElementOfLines)
    dev_set_color (['green', 'cyan'])
    dev_display (RegionDots)
    * 
    disp_continue_message (WindowHandle, 'black', 'true')
    stop ()
endfor