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EP0469836A2
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Image signal processing apparatus
Assignee: Canon Inc
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Filing: 1991-07-29
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Granted: —
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Expires: 2011-07-29
Abstract
Abstract An image signal processing apparatus comprises an image pick-up device (13) driven in an interlaced manner, a color filter (12) having portions for passing luminance components located in an offset manner and a memory (22) for storing the signal read out from the image pick-up device without sub-sampling it.
Inventors
- 👤 Taku C/O Canon Kabushiki Kaisha Yamagami
- 👤 Takashi C/O Canon Kabushiki Kaisha Sasaki
- 👤 Akira C/O Canon Kabushiki Kaisha Suga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 16:41
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/843; H04N25/00; H04N25/10; H04N25/11; H04N25/13; H04N25/133; H04N25/134; H04N25/135; H04N2209/00; H04N2209/04; H04N2209/041; H04N2209/042; H04N2209/045; H04N2209/046; H04N2209/048; H04N2209/049
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
69 words
Image signal processing apparatus comprising: an image pick-up device (13, 115), including color filter means, for providing an image signal in interlaced fields in response to an optical image incident thereon; and signal processing means including storage means, for processing the image signal to compensate for the consequences in the image signal of characteristics of the color filter means by combining image signal portions from different said interlaced fields.
Claim 2
Dependent Claim
100 words
Apparatus according to claim 1 in which the color filter means comprises first lines having first color filter portions for passing a first color component of the optical image and second lines having second color filter portions for passing a second color component of the optical image, the first lines lacking second color filter portions and the second lines lacking first color filter portions and the signal processing means compensating for the consequent lack of second color component signals in first lines of the image signal and lack of first color component signals in second lines of the image signal.
Claim 3
Dependent Claim
43 words
Apparatus according to claim 2 in which the first lines of the image signal are lines of a first said interlaced field and the second lines of image signal are lines of a second said interlaced field which is interlaced with the first.
Claim 4
Dependent Claim
28 words
Apparatus according to claim 2 or claim 3 in which the first lines of the color filter means alternate with the second lines of the color filter means.
Claim 5
Dependent Claim
60 words
Apparatus according to any one of the preceding claims in which the color filter means has offset filter portions for passing a component of the optical image, the offset filter portions being in positions arranged in an offset manner in the filter means, and the signal processing means compensates for the absence of the offset filter portions at other positions.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 5 in which the signal processing means compensates for the absence of the offset filter portions at a particular position by use of signals stored in the storage means.
Claim 7
Dependent Claim
20 words
Apparatus according to claim 5 or claim 6 in which the offset filter portions are Y or G filter portions.
Claim 8
Dependent Claim
51 words
Apparatus according to any one of claims 5 to 7 in which the offset filter portions are arranged in lines with a first pattern of offset filter portions and lines with a second pattern of offset filter portions, and lines with the first pattern alternate with lines of the second pattern.
Claim 9
Dependent Claim
54 words
Apparatus according to any one of claims 5 to 7 in which offset filter portions corresponding to the image signal read in one said interlaced field are arranged in a pattern offset with respect to the pattern of the offset filter portions corresponding to the image signal read in a successive said interlaced field.
Claim 10
Dependent Claim
96 words
An image signal processing apparatus comprising: (a) image pick-up means (13, 115) for photoconverting an optical image into an electrical image signal in interlaced fields; (b) color filter means located in front of the image pick-up means, having luminance filter portions for passing a luminance component of the optical image and color filter portions for passing a color component of the optical image, wherein the luminance filter portions are located in an offset manner; and (c) storage means for storing a signal derived from the said electrical image signal of the image pick-up means without sub-sampling.
Claim 11
Dependent Claim
25 words
An apparatus according to claim 10, further comprising interpolating means for interpolating a missing signal portion by using the signals stored in the storage means.
Claim 12
Dependent Claim
17 words
An apparatus according to claim 11 in which the interpolating means interpolates a missing luminance signal portion.
Claim 13
Dependent Claim
32 words
An apparatus according to claim 11 or claim 12 in which the interpolating means interpolates a signal portion missing from one said field by using a stored signal for another said field.
Claim 14
Independent Claim
46 words
An apparatus according to any one of claims 10 to 13, wherein the color filter portions comprise first color filter portions for passing a first color component of the optical image and second color filter portions for passing a second color component of the optical image.
Claim 15
Dependent Claim
19 words
Apparatus according to any one of claims 10 to 14, wherein the luminance filter portions pass the color green.
Claim 16
Dependent Claim
35 words
Apparatus according to any one of the preceding claims in which the storage means comprises a delay means (33, 34, 39, 40, 53, 54, 59) for delaying at least a part of the image signal.
Claim 17
Dependent Claim
26 words
Apparatus according to claim 16 in which the delay means comprises means (39, 59) with a delay of approximately one field period of the image signal.
Claim 18
Dependent Claim
28 words
Apparatus according to claim 16 or claim 17 in which the delay means comprises means (40) with a delay of approximately one line period of the image signal.
Claim 19
Dependent Claim
23 words
Apparatus according to any one of the preceding claims in which the storage means comprises a field memory (39, 59, 117, 118, 119).
Claim 20
Independent Claim
21 words
An apparatus according to any one of the preceding claims, wherein the image pick-up means (13, 115) comprises an interline CCD.
Claim 21
Independent Claim
26 words
An apparatus according to any of the preceding claims in which the color filter means comprises filter portions for passing one of red, green and blue.
Claim 22
Independent Claim
28 words
An apparatus according to any one of claims 1 to 20 in which the color filter means comprises filter portions for passing one of cyan, magenta and yellow.
References Cited (Backward Citations)
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