Contributions to rotation invariant character recognition:
Saved in:
| Main Author: | |
|---|---|
| Format: | Book |
| Language: | German English |
| Published: |
Paderborn
Elektrische Meßtechnik, Univ. Paderborn
1994
|
| Series: | Meßtechnische Berichte
8 |
| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Item Description: | Zugl.: Paderborn, Univ., Diss., 1994 |
| Physical Description: | II, 138 S. Ill., graph. Darst. |
Staff View
MARC
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| 100 | 1 | |a Luca, Dragos Ioan |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Contributions to rotation invariant character recognition |c Dragos Ioan Luca |
| 264 | 1 | |a Paderborn |b Elektrische Meßtechnik, Univ. Paderborn |c 1994 | |
| 300 | |a II, 138 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 1 | |a Meßtechnische Berichte |v 8 | |
| 500 | |a Zugl.: Paderborn, Univ., Diss., 1994 | ||
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| 943 | 1 | |a oai:aleph.bib-bvb.de:BVB01-006547743 | |
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| _version_ | 1807324067091447808 |
|---|---|
| adam_text |
I
CONTENT
1
INTRODUCTION.!
2
REVIEW
OF
OPTICAL
CHARACTER
RECOGNITION
METHODS
.3
2.1
IMAGE
PROCESSING
AND
RECOGNITION
BY
COMPUTERS
.
3
2.2
REVIEW
OF
FEATURES
USED
IN
OCR
.
8
2.2.1
GLOBAL
FEATURES
.
9
2.2.1.1
FEATURES
RELATED
TO
PIXEL
VALUES
.
9
2.2.1.2
FEATURES
DERIVED
FROM
ORTHOGONAL
TRANSFORMS
.
10
2.2.1.3
STATISTIC
FEATURES
.
13
2.2.2
STRUCTURAL
FEATURES
.
15
2.3
THE
ZEMIKE
TRANSFORM
.
18
2.3.1
DEFINITION
.
18
2.3.2
PROPERTIES
.
21
2.3.2.1
PROPERTIES
CONCERNING
ROTATION
.
21
2.3.2.2
PROPERTIES
CONCERNING
REFLECTION
.
22
2.3.2.3
CONSTRUCTION
OF
INVARIANTS
.
23
2.3.3
RELATION
BETWEEN
ZEMIKE
MOMENTS
AND
OTHER
MOMENTS
.
25
2.4
REVIEW
OF
CLASSIFIERS
USED
IN
OCR
.
32
2.4.1
PARAMETRIC
METHODS
.
32
2.4.2
NONPARAMETRIC
METHODS
.
34
2.4.3
ARTIFICIAL
NEURAL
NETWORKS
.
35
2.4.3.1
THE
MULTILAYER
PERCEPTRON
AND
THE
BACKPROPAGATION
RULE
.
39
2.4.3.2
THE
CONDENSED
NEAREST
NEIGHBOUR
NETWORK
.
43
3
NEW
METHODS
FOR
ROTATION
INVARIANT
3.1
LEARNING
THE
ZEMIKE
TRANSFORM
WITH
A
MLP
.
47
3.1.1
EXAMPLES
FOR
FUNCTION
APPROXIMATION
WITH
A
MLP
.
48
3.1.2
ESTIMATION
OF
ZEMIKE
MOMENT
MAGNITUDES
.
51
3.1.3
A
NEW
METHOD
FOR
LEARNING
THE
ZEMIKE
TRANSFORM
WITH
A
MLP
.
55
3.2
A
NEW
ALGORITHM
FOR
ROTATION
NORMALISATION
.
59
II
CONTENT
4
RESULTS.
67
4.1
RECOGNITION
OF
MACHINE-PRINTED
NUMERALS
.
68
4.1.1
IMAGE
PREPROCESSING
.
69
4.1.2
SELECTION
OF
FEATURES
AND
RESULTS
OF
CLASSIFICATION
.
72
4.2
RECOGNITION
OF
HAND-PRINTED
NUMERALS
.
80
4.2.1
IMAGE
PREPROCESSING
.
82
4.2.2
RESULTS
OF
CLASSIFICATION
.
84
4.3
DESCRIPTION
OF
THE
CLASSIFICATION
PROGRAM
.
90
5
CONCLUSIONS.
93
REFERENCES.
95
LIST
OF
SYMBOLS.
107
DATA
SETS
USED
FOR
THE
TRAINIG
AND
TEST
OF
THE
CNNN
AND
THE
MLP.
ILL
APPENDICES
A
A
SURVEY
OF
OCR
SYSTEMS
USING
ZEMIKE
MOMENT
INVARIANTS
.113
B
APPROXIMATION
OF
A
ONE-DIMENSIONAL
FUNCTION
WITH
A
MLP
.115
C
COMPUTED
AND
ESTIMATED
ZEMIKE
MOMENT
MAGNITUDES
.
119
D
APPROXIMATION
OF
THE
ZEMIKE
COEFFICIENTS
WITH
THE
MLP
.
121
E
A
COMPARISON
OF
\DTM\
VALUES
FOR
ROTATED,
SCALED
AND
DIFFERENTLY
SHAPED
IMAGES
.
125
F
TEST
SETS
USED
AT
THE
CLASSIFICATION
OF
PUNCHED
DIGITS
.
127
G
HANDWRITTEN
DIGIT
IMAGES,
DATA
SET
"EMT"
.
129
H
HANDWRITTEN
DIGIT
IMAGES,
DATA
SET
"
ULM
"
.133
I
ERROR
VS.
REJECTION
RATES
FOR
THE
CLASSIFICATION
OF
PATTERNS
IN
SET
"ULM"
.135 |
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| id | DE-604.BV009888094 |
| illustrated | Illustrated |
| indexdate | 2024-08-14T01:22:23Z |
| institution | BVB |
| language | German English |
| oai_aleph_id | oai:aleph.bib-bvb.de:BVB01-006547743 |
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| physical | II, 138 S. Ill., graph. Darst. |
| publishDate | 1994 |
| publishDateSearch | 1994 |
| publishDateSort | 1994 |
| publisher | Elektrische Meßtechnik, Univ. Paderborn |
| record_format | marc |
| series | Meßtechnische Berichte |
| series2 | Meßtechnische Berichte |
| spelling | Luca, Dragos Ioan Verfasser aut Contributions to rotation invariant character recognition Dragos Ioan Luca Paderborn Elektrische Meßtechnik, Univ. Paderborn 1994 II, 138 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Meßtechnische Berichte 8 Zugl.: Paderborn, Univ., Diss., 1994 Optische Zeichenerkennung (DE-588)4310936-6 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Optische Zeichenerkennung (DE-588)4310936-6 s DE-604 Meßtechnische Berichte 8 (DE-604)BV008336144 8 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=006547743&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Luca, Dragos Ioan Contributions to rotation invariant character recognition Meßtechnische Berichte Optische Zeichenerkennung (DE-588)4310936-6 gnd |
| subject_GND | (DE-588)4310936-6 (DE-588)4113937-9 |
| title | Contributions to rotation invariant character recognition |
| title_auth | Contributions to rotation invariant character recognition |
| title_exact_search | Contributions to rotation invariant character recognition |
| title_full | Contributions to rotation invariant character recognition Dragos Ioan Luca |
| title_fullStr | Contributions to rotation invariant character recognition Dragos Ioan Luca |
| title_full_unstemmed | Contributions to rotation invariant character recognition Dragos Ioan Luca |
| title_short | Contributions to rotation invariant character recognition |
| title_sort | contributions to rotation invariant character recognition |
| topic | Optische Zeichenerkennung (DE-588)4310936-6 gnd |
| topic_facet | Optische Zeichenerkennung Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=006547743&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| volume_link | (DE-604)BV008336144 |
| work_keys_str_mv | AT lucadragosioan contributionstorotationinvariantcharacterrecognition |