Patent Document ID: 20150356372
Application ID: 14759256
Patent Status: 0

Claim One:
1. A character recognition method, comprising: step 1 comprising: reading a character image; step 2 comprising: image preprocessing; step 3 comprising: character segmentation; step 4 comprising: edge extraction, i.e., detecting edge points of the character by using an edge detecting operator; step 5 comprising: feature extraction, i.e., expressing features of each edge point of each character by distances from rest edge points of the character to the edge point, wherein to the features of the edge point of the character are represented by an eigenvector (P 1k , P 2k. .. P Mk ), thus eigenvectors of features of the character are represented by a matrix ( P 21 P 31 … P M 1 P 12` P 32 … P M 2 ⋮ ⋮ ⋱ ⋮ P 1 M P 2 M … P ( M - 1 ) M ) ; step 6 comprising: feature processing, i.e., mapping the eigenvector (P 1k , P 2k. .. P Mk ) to a matrix T, to obtain a same dimension for eigenvectors of all characters, wherein T = ( t 11 t 12 … t 1 v t 21 t 22 … t 2 v ⋮ ⋮ ⋱ ⋮ t u 1 t u 2 … t uv ) ; and step 7 comprising: template matching, i.e., assuming that an edge of a character Θ to be recognized has M points X 1 , X 2. .. X M , and a standard character template Δ has N points Y 1 , Y 2. .. Y N , calculating a distance between the point X i and the point Y j in the standard character template Δ by an equation as: D ij ≡ D ( X i , Y j ) = ∑ m = 1 u ∑ n = 1 v ( T i ( m , n ) - T j ( m , n ) ) 2 ; denoting D iπ(i) =min D ij , which indicates that a point Y π(i) in the standard character template Δ is a best matching point for the point X i , a total distance from the character Θ to be recognized to the standard character template Δ being D Θ Δ = ∑ i = 0 M D i π ( i ) ; and in a case that there are total Γ standard character templates, calculating total distances from the character Θ to be recognized to each standard character template respectively, and a template with a minimal distance to the character is a recognition result for the character.