Unusual Patterns
unusual styles
weirdos
Invariance
translation
(anim)
scale (anim)
rotation (anim)
squeezing (anim)
stroke width
(anim)
Noise Resistance
noisy 3 and 6
noisy 2 (anim)
noisy 4 (anim)
Multiple Character
various stills
dancing 00
(anim)
dancing 384
(anim)
Complex cases (anim)
35 -> 53
12 -> 4-> 21
23 -> 32
30 + noise
31-51-57-61
Shift Invariance
Invariance with respect to vertical translations is necessary since the positioning of individual characters in a string is never perfect.
When the shape is moved too far down, it is no longer recognized (the "4" disappears).