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get_smallest_skew: when shifting search range of rotation angle, compare resulting (maximum) variances instead of blindly assuming the new range is better

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Robert Sachunsky 2025-09-02 15:01:52 +02:00
parent dc0caad512
commit abf5c0f845
1 changed files with 19 additions and 13 deletions
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32
src/eynollah/utils/separate_lines.py
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@ -1486,33 +1486,36 @@ def return_deskew_slop(img_patch_org, sigma_des,n_tot_angles=100,
if main_page and img_patch_org.shape[1] > img_patch_org.shape[0]:
angles = np.array([-45, 0, 45, 90,])
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angle, _ = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angles = np.linspace(angle - 22.5, angle + 22.5, n_tot_angles)
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angle, _ = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
elif main_page:
angles = np.linspace(-12, 12, n_tot_angles)#np.array([0 , 45 , 90 , -45])
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angle, var = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
early_slope_edge=11
if abs(angle) > early_slope_edge:
if angle < 0:
angles = np.linspace(-90, -12, n_tot_angles)
angles2 = np.linspace(-90, -12, n_tot_angles)
else:
angles = np.linspace(90, 12, n_tot_angles)
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angles2 = np.linspace(90, 12, n_tot_angles)
angle2, var2 = get_smallest_skew(img_resized, sigma_des, angles2, map=map, logger=logger, plotter=plotter)
if var2 > var:
angle = angle2
else:
angles = np.linspace(-25, 25, int(0.5 * n_tot_angles) + 10)
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angle, var = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
early_slope_edge=22
if abs(angle) > early_slope_edge:
if angle < 0:
angles = np.linspace(-90, -25, int(0.5 * n_tot_angles) + 10)
angles2 = np.linspace(-90, -25, int(0.5 * n_tot_angles) + 10)
else:
angles = np.linspace(90, 25, int(0.5 * n_tot_angles) + 10)
angle = get_smallest_skew(img_resized, sigma_des, angles, map=map, logger=logger, plotter=plotter)
angles2 = np.linspace(90, 25, int(0.5 * n_tot_angles) + 10)
angle2, var2 = get_smallest_skew(img_resized, sigma_des, angles2, map=map, logger=logger, plotter=plotter)
if var2 > var:
angle = angle2
return angle
def get_smallest_skew(img, sigma_des, angles, logger=None, plotter=None, map=map):
@ -1524,11 +1527,14 @@ def get_smallest_skew(img, sigma_des, angles, logger=None, plotter=None, map=map
try:
var_res = np.array(results)
assert var_res.any()
angle = angles[np.argmax(var_res)]
idx = np.argmax(var_res)
angle = angles[idx]
var = var_res[idx]
except:
logger.exception("cannot determine best angle among %s", str(angles))
angle = 0
return angle
var = 0
return angle, var
def do_work_of_slopes_new(
box_text, contour, contour_par, index_r_con,