EP1028389A2
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Arithmetic unit for image transformation
Assignee: FIT Corp
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Filing: 2000-01-07
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Granted: —
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Expires: 2020-01-07
Abstract
Abstract An arithmetic unit for image transformation is disclosed for transforming a fisheye image obtained by using a fisheye lens (2) into a plane image for display, comprising: a first coordinate calculating unit (35) for obtaining first projection coordinates derived by projecting coordinates on the plane image onto a fisheye image face as an imaginary object face; and a second coordinate calculating unit (36) for obtaining second projection coordinates derived by projecting the first projection coordinates obtained by the first coordinate calculating unit (35) onto the fisheye image face.
Inventors
- 👤 Fuminori Shiota
- 👤 Tetsuji Matsui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:31
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/04; G06T3/047
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
An arithmetic unit for image transformation for
transforming a fisheye image obtained by using a fisheye
lens (2) into a plane image for display, characterized by
comprising: a first coordinate calculating unit (35) for
obtaining first projection coordinates derived by
projecting coordinates on the plane image onto a fisheye
image face as an imaginary object face; and a second coordinate calculating unit (36) for
obtaining second projection coordinates derived by
projecting the first projection coordinates obtained by
the first coordinate calculating unit (35) onto the
fisheye image face.
Claim 2
Dependent Claim
32 words
The arithmetic unit according to claim 1,
characterized in that a logic circuit for arithmetic
operation has a pipelined architecture in each of the
first and second coordinate calculating units (35, 36).
Claim 3
Dependent Claim
43 words
The arithmetic unit according to claim 2,
characterized in that the logic circuit for arithmetic
operation is limited to calculations of addition,
subtraction, multiplication, and square root, and
division and other function calculations are handled by
referring to a lookup table (37, 38).
Claim 4
Dependent Claim
47 words
The arithmetic unit according to claim 3,
characterized in that the second coordinate calculating
unit (36) is used to obtain the second projection
coordinates by multiplying the first projection
coordinates by a predetermined coefficient (k1) and the
predetermined coefficient (k1) is obtained from a lookup
table (38).
Claim 5
Dependent Claim
121 words
A monitoring system comprising a CCD camera (1) to which a fisheye lens (2) is
attached and a Peripheral Component Interconnect (PCI) bus
substrate (3) having an arithmetic unit for image
transformation for transforming a fisheye image obtained
by using the fisheye lens (2) into a plane image for
display, characterized in that the arithmetic unit for image
transformation comprises: a first coordinate calculating unit (35) for
obtaining first projection coordinates derived by
projecting coordinates on the plane image onto a fisheye
image face as an imaginary object face; and a second coordinate calculating unit (36) for
obtaining second projection coordinates derived by
projecting the first projection coordinates obtained by
the first coordinate calculating unit (35) onto the
fisheye image face.
Claim 6
Dependent Claim
32 words
The monitoring system according to claim 5,
characterized in that a logic circuit for arithmetic
operation has a pipelined architecture in each of the
first and second coordinate calculating units (35, 36).
Claim 7
Dependent Claim
43 words
The monitoring system according to claim 6,
characterized in that the logic circuit for arithmetic
operation is limited to calculations of addition,
subtraction, multiplication, and square root, and
division and other function calculations are performed by
referring to a lookup table (37, 38).
Claim 8
Dependent Claim
47 words
The monitoring system according to claim 7,
characterized in that the second coordinate calculating
unit (36) is used to obtain the second projection
coordinates by multiplying the first projection
coordinates by a predetermined coefficient (k1) and the
predetermined coefficient (k1) is obtained from a lookup
table (38).
References Cited (Backward Citations)
No citation records indexed.
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