Optical Recognition of Handwritten Digits

About

Two versions of this database available; see folder We used preprocessing programs made available by NIST to extract normalized bitmaps of handwritten digits from a preprinted form. From a total of 43 people, 30 contributed to the training set and different 13 to the test set. 32x32 bitmaps are divided into nonoverlapping blocks of 4x4 and the number of on pixels are counted in each block. This generates an input matrix of 8x8 where each element is an integer in the range 0..16. This reduces dimensionality and gives invariance to small distortions. For info on NIST preprocessing routines, see M. D. Garris, J. L. Blue, G. T. Candela, D. L. Dimmick, J. Geist, P. J. Grother, S. A. Janet, and C. L. Wilson, NIST Form-Based Handprint Recognition System, NISTIR 5469, 1994. Variables Info: All input attributes are integers in the range 0..16. The last attribute is the class code 0..9 Class labels: Class: No of examples in training set 0: 376 1: 389 2: 380 3: 389 4: 387 5: 376 6: 377 7: 387 8: 380 9: 382 Class: No of examples in testing set 0: 178 1: 182 2: 177 3: 183 4: 181 5: 182 6: 181 7: 179 8: 174 9: 180

Subject Area

Computer Science

Instances

5,620

Features

Data Types

Multivariate

Tasks

Classification

Feature Types

Integer

Features

Name	Role	Type	Units	Missing Values
Attribute1	Feature	Integer	-	No
Attribute2	Feature	Integer	-	No
Attribute3	Feature	Integer	-	No
Attribute4	Feature	Integer	-	No
Attribute5	Feature	Integer	-	No
Attribute6	Feature	Integer	-	No
Attribute7	Feature	Integer	-	No
Attribute8	Feature	Integer	-	No
Attribute9	Feature	Integer	-	No
Attribute10	Feature	Integer	-	No
Attribute11	Feature	Integer	-	No
Attribute12	Feature	Integer	-	No
Attribute13	Feature	Integer	-	No
Attribute14	Feature	Integer	-	No
Attribute15	Feature	Integer	-	No
Attribute16	Feature	Integer	-	No
Attribute17	Feature	Integer	-	No
Attribute18	Feature	Integer	-	No
Attribute19	Feature	Integer	-	No
Attribute20	Feature	Integer	-	No
Attribute21	Feature	Integer	-	No
Attribute22	Feature	Integer	-	No
Attribute23	Feature	Integer	-	No
Attribute24	Feature	Integer	-	No
Attribute25	Feature	Integer	-	No
Attribute26	Feature	Integer	-	No
Attribute27	Feature	Integer	-	No
Attribute28	Feature	Integer	-	No
Attribute29	Feature	Integer	-	No
Attribute30	Feature	Integer	-	No
Attribute31	Feature	Integer	-	No
Attribute32	Feature	Integer	-	No
Attribute33	Feature	Integer	-	No
Attribute34	Feature	Integer	-	No
Attribute35	Feature	Integer	-	No
Attribute36	Feature	Integer	-	No
Attribute37	Feature	Integer	-	No
Attribute38	Feature	Integer	-	No
Attribute39	Feature	Integer	-	No
Attribute40	Feature	Integer	-	No
Attribute41	Feature	Integer	-	No
Attribute42	Feature	Integer	-	No
Attribute43	Feature	Integer	-	No
Attribute44	Feature	Integer	-	No
Attribute45	Feature	Integer	-	No
Attribute46	Feature	Integer	-	No
Attribute47	Feature	Integer	-	No
Attribute48	Feature	Integer	-	No
Attribute49	Feature	Integer	-	No
Attribute50	Feature	Integer	-	No
Attribute51	Feature	Integer	-	No
Attribute52	Feature	Integer	-	No
Attribute53	Feature	Integer	-	No
Attribute54	Feature	Integer	-	No
Attribute55	Feature	Integer	-	No
Attribute56	Feature	Integer	-	No
Attribute57	Feature	Integer	-	No
Attribute58	Feature	Integer	-	No
Attribute59	Feature	Integer	-	No
Attribute60	Feature	Integer	-	No
Attribute61	Feature	Integer	-	No
Attribute62	Feature	Integer	-	No
Attribute63	Feature	Integer	-	No
Attribute64	Feature	Integer	-	No
class	Target	Categorical	-	No