def draw_kpts3(kpts, method):
with warnings.catch_warnings():
from itertools import izip
from matplotlib.transforms import Affine2D
ell_linewidth=1
ell_alpha=.5
ell_color = (1,1,1)
ax = plt.gca()
kptsT = kpts.T
(x, y, a, c, d) = kptsT
b = np.zeros(len(a), dtype=float)
if method == 0: # original inverse square root
warnings.simplefilter("ignore")
aIS = 1/np.sqrt(a)
bIS = c/(-np.sqrt(a)*d - a*np.sqrt(d))
cIS = b
dIS = 1/np.sqrt(d)
#cIS = (c/np.sqrt(d) - c/np.sqrt(d)) / (a-d+eps)
elif method == 1:
# Just inverse
aIS = 1/a
bIS = -c/(a*d)
cIS = b
dIS = 1/d
elif method == 2:
# Identity
aIS = c
bIS = b
cIS = c
dIS = d
elif method == 3:
print('m3')
det_ = sqrt(a*d)
#det_ = det_**2
print(det_)
a/=det_
b/=det_
c/=det_
d/=det_
print(a*d)
print(det_)
# Modify det_
#det_ = 1/(det_)**2
# inverse square root
aIS = 1/a
bIS = -c/(a*d)
cIS = b
dIS = 1/d
aIS /= sqrt(det_)
bIS /= sqrt(det_)
cIS /= sqrt(det_)
dIS /= sqrt(det_)
print(aIS*dIS)
elif method == 4:
print('m4')
det_ = sqrt(a*d)
#det_ = det_**2
print(det_)
a/=det_
b/=det_
c/=det_
d/=det_
print(a*d)
print(det_)
# Modify det_
#det_ = 1/(det_)**2
# inverse square root
aIS = 1/a
bIS = -c/(a*d)
cIS = b
dIS = 1/d
aIS /= (det_)
bIS /= (det_)
cIS /= (det_)
dIS /= (det_)
print(aIS*dIS)
elif method == 5:
print('m5')
# inverse square root
A_list = extern_feat.expand_acd(kptsT[2:5].T)
aIS = 1/np.sqrt(a)
bIS = c/(-np.sqrt(a)*d - a*np.sqrt(d))
cIS = b
dIS = 1/np.sqrt(d)
else:
print('unknown method %r' % (method,))
pass
kpts_iter = izip(x,y,aIS,bIS,cIS,dIS)
aff2d_list = [Affine2D([( a_, b_, x_),
( c_, d_, y_),
( 0 , 0 , 1)])
for (x_,y_,a_,b_,c_,d_) in kpts_iter]
ell_actors = [Circle((0,0), 1, transform=aff2d) for aff2d in aff2d_list]
ellipse_collection = matplotlib.collections.PatchCollection(ell_actors)
ellipse_collection.set_facecolor('none')
ellipse_collection.set_transform(ax.transData)
ellipse_collection.set_alpha(ell_alpha)
ellipse_collection.set_linewidth(ell_linewidth)
ellipse_collection.set_edgecolor(ell_color)
ax.add_collection(ellipse_collection)
ellipse_collection.set_alpha(ell_alpha)
ellipse_collection.set_linewidth(ell_linewidth)
ellipse_collection.set_edgecolor(ell_color)
ax.add_collection(ellipse_collection)
rchip_fpath = 'tpl/extern_feat/lena.png'
rchip_fpath = 'tpl/extern_feat/zebra.jpg'
rchip_fpath = os.path.realpath(rchip_fpath)
rchip = cv2.cvtColor(cv2.imread(rchip_fpath, flags=cv2.IMREAD_COLOR), cv2.COLOR_BGR2RGB)
outname = extern_feat.compute_perdoch_text_feats(rchip_fpath)
#outname = compute_inria_text_feats(rchip_fpath, 'harris', 'sift')
# Keep the wrong way to compare
kpts0, desc = extern_feat.read_text_feat_file(outname)
invE = extern_feat.expand_invET(kpts0[:,2:5].T)[0]
kpts1 = extern_feat.fix_kpts_hack(kpts0[:], method=1)
A1 = extern_feat.expand_acd(kpts1[:,2:5])[0]
#kpts, desc = filter_kpts_scale(kpts, desc)
df2.figure(1, doclf=True)
df2.DARKEN = .5
#----
df2.imshow(rchip, plotnum=(2,3,1), title='0 before (inverse square root)')
draw_kpts3(kpts0.copy(),0)
#----
df2.imshow(rchip, plotnum=(2,3,2), title='1 just inverse')
draw_kpts3(kpts1.copy(),1)
#----
df2.imshow(rchip, plotnum=(2,3,3), title='2 identity')
draw_kpts3(kpts1.copy(), 2)