EP0649261B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image data processing and encrypting apparatus
Assignee: Canon Inc
•
Filing: 1994-10-17
•
Granted: 2002-01-23
•
Expires: 2014-10-17
Abstract
No abstract record available.
Inventors
- 👤 Masahiko C/O Canon Kabushiki Kaisha Enari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 13:19
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/234; H04N21/2343; H04N21/234327; H04N19/00; H04N19/60; H04N19/61; H04N19/63; H04N21/2347; H04N21/23476; H04N21/25; H04N21/266; H04N21/2662; H04N7/00; H04N7/16; H04N7/167; H04N7/1675; H04N7/24; H04N19/30
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
120 words
An image processing apparatus comprising: a) input means for inputting an image signal
(210); b) separation means (214 to 224) for separating
said image signal into a low frequency component and a
high frequency component in each of horizontal and
vertical directions and for producing spatial frequency
bands (LL, LH, HL, HH) from said image signal; c) encoding means (226 to 232) for high-efficiency
encoding the spatial frequency bands (LH, HL, HH)
including a highest frequency component and for high-efficiency
encoding the spatial frequency band (LL)
including a lowest frequency component; and d) encryption means (236) for encrypting only the
encoded spatial frequency bands including the highest
frequency component using an encryption key in accordance
with a predetermined encryption algorithm.
Claim 2
Dependent Claim
111 words
An apparatus according to claim 1, wherein said
separation means is operable to produce a first spatial
frequency band (LL) including the low frequency component
of the horizontal direction and the low frequency
component of the vertical direction, a second spatial
frequency band (LH) including the low frequency component
of the horizontal direction and the high frequency
component of the vertical direction, a third spatial
frequency band (HL) including the high frequency
component of the horizontal direction and the low
frequency component of the vertical direction, and a
fourth spatial frequency band (HH) including the high
frequency component of the horizontal direction and the
high frequency component of the vertical direction.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1 or 2, wherein said
encoding means is operable to encode the spatial
frequency bands using variable length encoders.
Claim 4
Independent Claim
39 words
An apparatus according to any of claims 1 to 3,
further comprising: multiplexing means (234) for multiplexing the
spatial frequency bands to be encrypted, and wherein said encryption means is operable to
encrypt an output of said multiplexing means.
Claim 5
Independent Claim
40 words
An apparatus according to any of claims 1 to 4,
further comprising second multiplexing means (240) for
multiplexing the encoded spatial frequency bands
encrypted by said encryption means and the encoded
spatial frequency band not encrypted by said encryption
means.
Claim 6
Dependent Claim
102 words
An image processing apparatus comprising: a) input means (250) for inputting spatial
frequency bands (LH, HL, HH) including a highest
frequency component and spatial frequency band (LL)
including a lowest frequency component, the spatial
frequency bands including the highest frequency component
are encrypted; b) decryption means (256 or 256') for decrypting
the spatial frequency bands including the highest
frequency component using a decryption key in accordance
with a predetermined decryption algorithm; and c) decoding means (254 to 266) for decoding the
decrypted spatial frequency bands including the highest
frequency component and for decoding the spatial
frequency band including the lowest frequency component.
Claim 7
Dependent Claim
108 words
An apparatus according to claim 6, wherein said
input means inputs a first spatial frequency band (LL)
including the low frequency component of the horizontal
direction and the low frequency component of the vertical
direction, a second spatial frequency band (LH) including
the low frequency component in the horizontal direction
and the high frequency component in the vertical
direction, a third spatial frequency band (HL) including
the high frequency component of the horizontal direction
and the low frequency component of the vertical direction
and a fourth spatial frequency band (HH) including the
high frequency component of the horizontal direction and
the high frequency component in the vertical direction.
Claim 8
Independent Claim
29 words
An apparatus according to any of claims 6 and 7,
further comprising: synthesizing means (270 to 280) for synthesizing the
decrypted spatial frequency bands with other spatial
frequency bands.
Claim 9
Independent Claim
36 words
An apparatus according to any of claims 6 to 8,
further comprising demultiplexing means (260) for
demultiplexing the decrypted spatial frequency bands, and
said decoding means is operable to decode an output of
said demultiplexing means.
Claim 10
Independent Claim
26 words
An apparatus according to any of claims 6 to 9,
wherein said decoding means is operable to decode the
spatial frequency bands using variable length decoders.
Claim 11
Independent Claim
35 words
An apparatus according to any of claims 6 to 10,
further comprising inhibiting means (286) operable to
inhibit an output of said decryption means when said
decryption means cannot decrypt the encrypted spatial
frequency band.
Claim 12
Independent Claim
38 words
An apparatus according to any of claims 6 to 11,
further comprising means (288) for producing a
predetermined signal in lieu of the encrypted spatial
frequency band when said decryption means cannot decrypt
the encrypted spatial frequency band.
Claim 13
Dependent Claim
117 words
An image processing method comprising: a) an input step of inputting an image signal
(210); b) a separation step of separating said image
signal into a low frequency component and a high
frequency component in each of horizontal and vertical
directions and of producing spatial frequency bands (LL,
LH, HL, HH) from said image signal; c) an encoding step of high-efficiency encoding
the spatial frequency bands (LH, HL, HH) including a
highest frequency component and of high-efficiency
encoding the spatial frequency band (LL) including a
lowest frequency component; and d) an encryption step of encrypting only the
encoded spatial frequency bands including the highest
frequency component using an encryption key in accordance
with a predetermined encryption algorithm.
Claim 14
Dependent Claim
109 words
A method as claimed in claim 13, wherein said
separation step produces a first spatial frequency band
(LL) including the low frequency component of the
horizontal direction and the low frequency component of
the vertical direction, a second spatial frequency band
(LH) including the low frequency component of the
horizontal direction and the high frequency component of
the vertical direction, a third spatial frequency band
(HL) including the high frequency component of the
horizontal direction and the low frequency component of
the vertical direction, and a fourth spatial frequency
band (HH) including the high frequency component of the
horizontal direction and the high frequency component of
the vertical direction.
Claim 15
Independent Claim
24 words
A method as claimed in any of claims 13 and 14
wherein said encoding step encode the spatial frequency
bands using variable length encoders.
Claim 16
Independent Claim
37 words
A method as claimed in any of claims 13 to 15,
further comprising: a multiplexing step of multiplexing the spatial
frequency bands to be encrypted, and wherein said encryption step encrypts an output of
said multiplexing step.
Claim 17
Independent Claim
41 words
A method as claimed in any of claims 13 to 16,
further comprising a second multiplexing step of
multiplexing the encoded spatial frequency bands
encrypted by said encryption step and the encoded spatial
frequency band not encrypted by said encryption step.
Claim 18
Dependent Claim
97 words
An image processing method comprising: a) an input step inputting spatial frequency bands
(LH, HL, HH) including a highest frequency component and
spatial frequency band (LL) including a lowest frequency
component, the spatial frequency bands including the
highest frequency component are encrypted; b) a decryption step of decrypting the spatial
frequency bands including the highest frequency component
using a decryption key in accordance with a predetermined
decryption algorithm; and c) a decoding step of decoding the decrypted
spatial frequency bands including the highest frequency
component and of decoding the spatial frequency band
including the lowest frequency component.
Claim 19
Dependent Claim
109 words
A method as claimed in claim 18, wherein said input
step inputs a first spatial frequency band (LL) including
the low frequency component of the horizontal direction
and the low frequency component of the vertical
direction, a second spatial frequency band (LH) including
the low frequency component of the horizontal direction
and the high frequency component of the vertical
direction, a third spatial frequency band (HL) including
the high frequency component of the horizontal direction
and the low frequency component of the vertical direction
and a fourth spatial frequency band (HH) including the
high frequency component of the horizontal direction and
the high frequency component of the vertical direction.
Claim 20
Independent Claim
28 words
A method as claimed in any of claims 18 and 19,
further comprising: a synthesizing step of synthesizing the decrypted
spatial frequency bands with other spatial frequency
bands.
Claim 21
Independent Claim
37 words
A method as claimed in any of claims 18 to 20,
further comprising a demultiplexing step of
demultiplexing the decrypted spatial frequency bands, and
said decoding means is operable to decode an output of
said demultiplexing means.
Claim 22
Independent Claim
28 words
A method as claimed in any of claims 18 to 21,
wherein said decoding means is operable to decode the
spatial frequency bands using variable length decoders .
Claim 23
Independent Claim
35 words
A method as claimed in any of claims 18 to 22,
further comprising an inhibiting step of inhibiting an
output of said decryption step when said decryption step
cannot decrypt the encrypted spatial frequency band.
Claim 24
Independent Claim
39 words
A method as claimed in any of claims 18 to 23,
further comprising a step of producing a predetermined
signal in lieu of the encrypted spatial frequency band
when said decryption step cannot decrypt the encrypted
spatial frequency band.
References Cited (Backward Citations)
No citation records indexed.
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