flowchart TD
A[median filter]
B1[black hat]
B2[closing] 
C1[label: line detection]
C2[label: char detection]
D1[page crop]
D2[side crop]
E1[projection along x y]
E2[find_peaks]
E3[scribbled flag]
E4{tables detected}
F[straighten tilt]
G1[subtract lines]
G[dilation of characters]
H[center of mass lies in the cell]
I[YOLO net]
I2[HTR net]

A-.->B1-.->E1
A-->B2-->C1-->D1-->D2-->E1
E1-->E2-->E4
E4--No--xF--xC1--xD2
subgraph when table looks good
E4==Yes==>G1==>G==>C2==training data==>I
E4--oI--oI2
C2==>H==this may not work for small char , + -==>I2
E4-.->E3
end