EP0269053A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Light signal control circuit for image pick-up apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1987-11-23
•
Granted: —
•
Expires: 2007-11-23
Abstract
Abstract A light signal control circuit for an image pick-up apparatus is disclosed, wherein a substantial peak value of image pick-up signals is detected by a first level detection circuit (11; 101), a substantial average value of the image pick-up signals is detected by a second level detection circuit (12; 102), a brightness condition of an object is determined by a decision circuit (13; 103; 152), outputs of the first level detection circuit (11; 101) and the second level detection circuit (12; 102) are weighted by a weighting circuit (14; 104), and a stop of the image pick-up apparatus is controlled by a stop control circuit (8) in accordance with an output of the weighting circuit (14; 104). Optimum stop control corresponding to the brightness condition of the object is attained by controlling the weighting operation of the weighting circuit (14; 104) in accordance with an output of the decision circuit (13; 103; 152).
Inventors
- 👤 Atsushi Fujioka
- 👤 Atsushi Morimura
- 👤 Yoshinori Kitamura
- 👤 Hiroki Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:04
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70; H04N23/75; H04N23/71
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
187 words
A light signal control circuit for an image pick-up apparatus comprising: an average value detection circuit (12) for detecting a substantial average value of image pick-up signals corresponding to the brightness of a sensing area and producing a first signal corresponding to the substantial average value; a peak value detection circuit (11) for detecting a substantial peak value of the image pick-up signals and producing a second signal corresponding to the substantial peak value; a decision circuit (13) for detecting one of ratio and a difference between the substantial average value and the substantial peak value of the image pick-up signals and producing a third signal corresponding to said one of the ratio and the difference therebetween; a switching circuit (14) for determining which one of a fourth signal corresponding to the first signal and a fifth signal corresponding to the second signal should be outputted on the basis of the third signal; control means (1) for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of an output of said switching circuit.
Claim 2
Dependent Claim
187 words
A light signal control circuit for an image pick-up apparatus comprising: an average value detection circuit (12) for detecting a substantial average value of image pick-up signals corresponding to the brightness of a sensing area and producing a first signal corresponding to the substantial average value; a peak value detection circuit (11) for detecting a substantial peak value of the image pick-up signals and producing a second signal corresponding to the substantial peak value; a decision circuit (13) for detecting one of ratio and a difference between the substantial average value and the substantial peak value of the image pick-up signals and producing a third signal corresponding to said one of the ratio and the difference therebetween; a switching circuit (14) for determining which one of a fourth signal corresponding to the first signal and a fifth signal corresponding to the second signal should be outputted on the basis of the third signal; control means (1) for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of an output of said switching circuit.
Claim 3
Dependent Claim
62 words
The circuit according to Claim 1, wherein said peak value detection circuit (11) detects and produces an average value of the image pick-up signals in a small region of said sensing area, and said average value detection circuit (12) detects and produces an average value of the image pick-up signals in a region greater than the small region of said sensing area.
Claim 4
Dependent Claim
41 words
The circuit according to Claim 1, wherein said peak value detection circuit (11) detects a maximam one of average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 5
Dependent Claim
49 words
The circuit according to Claim 1, wherein said peak value detection circuit (11) produces an arithmetic mean of a predetermined number of larger average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 6
Dependent Claim
57 words
The circuit according to anyone of Claims 1 to 4, wherein said average value detection circuit (12) produces an arithmetic mean of average values other than a predetermined number of larger average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 7
Dependent Claim
58 words
The circuit according to the anyone of Claims 1 to 4, wherein said average value detection circuit (12) produces an arithmetic mean for average values other than a predetermined number of smaller average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 8
Dependent Claim
65 words
The circuit according to anyone of Claims 1 to 4, wherein said average value detection circuit (12) produces an arithmetic mean of average values other than a predetermined number of larger average values and a predetermined number of smaller average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 9
Dependent Claim
34 words
The circuit according to anyone of Claims 1 to 4, wherein said average value detection circuit (12) produces an average value of the image pick-up signals covering one whole image on said sensing area.
Claim 10
Dependent Claim
35 words
The circuit according to anyone of Claims 1 to 4, wherein said average value detection circuit (12) produces an average value of the image pick-up signals at a substantial center part of said sensing area.
Claim 11
Dependent Claim
35 words
The circuit according to anyone of Claims 1 to 9, wherein said decision circuit (13) compares an output of said average value detection circuit (12) with an output of said peak value detection circuit (11).
Claim 12
Dependent Claim
186 words
A light signal control circuit for an image pick-up apparatus comprising: an average value detection circuit (102) for detecting a substantial average value of image pick-up signals corresponding to the brightness of a sensing area and producing a first signal corresponding to the substantial average value; a peak value detection circuit (101) for detecting a substantial peak value of the image pick-up signals and producing a second signal corresponding to the substantial peak value; a decision circuit (103) for detecting one of the ratio and the difference between the substantial average value and the substantial peak value of the image pick-up signals and producing a third signal corresponding to said one of the ratio and the difference therebetween; a weighting circuit (104) for producing a fourth signal obtained by applying predetermined weighting factors respectively to the first signal and the second signal on the basis of the third signal; control means (1) for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of the fourth signal outputted from the weighting circuit (104).
Claim 13
Dependent Claim
186 words
A light signal control circuit for an image pick-up apparatus comprising: an average value detection circuit (102) for detecting a substantial average value of image pick-up signals corresponding to the brightness of a sensing area and producing a first signal corresponding to the substantial average value; a peak value detection circuit (101) for detecting a substantial peak value of the image pick-up signals and producing a second signal corresponding to the substantial peak value; a decision circuit (103) for detecting one of the ratio and the difference between the substantial average value and the substantial peak value of the image pick-up signals and producing a third signal corresponding to said one of the ratio and the difference therebetween; a weighting circuit (104) for producing a fourth signal obtained by applying predetermined weighting factors respectively to the first signal and the second signal on the basis of the third signal; control means (1) for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of the fourth signal outputted from the weighting circuit (104).
Claim 14
Dependent Claim
62 words
The circuit according to Claim 11, wherein said peak value detection circuit (101) detects and produces an average value of the image pick-up signals in a small region of said sensing area, and said average value detection circuit (102) detects and produces an average value of the image pick-up signals in a region greater than the small region of said sensing area.
Claim 15
Dependent Claim
41 words
The circuit according to Claim 11, wherein said peak value detection circuit (101) detects a maximum one of average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 16
Dependent Claim
49 words
The circuit according to Claim 11, wherein the peak value detection circuit (101) produces an arithmetic mean of a predetermined number of larger average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 17
Dependent Claim
57 words
The circuit according to anyone of Claims 11 to 14, wherein said average value detection circuit (102) produces an arithmetic mean of average values other than a predetermined number of larger average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 18
Dependent Claim
57 words
The circuit according to anyone of Claims 11 to 14, wherein said average value detection circuit (102) produces an arithmetic mean of average values other than a predetermined number of smaller average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 19
Dependent Claim
65 words
The circuit according to anyone of Claims 11 to 14, wherein said average value detection circuit (102) produces an arithmetic mean of average values other than a predetermined number of larger average values and a predetermined number of smaller average values among average values of the image pick-up signals in respective regions of a plurality of regions into which said sensing area has been divided.
Claim 20
Dependent Claim
34 words
The circuit according to anyone of Claims 11 to 14, wherein said average value detection circuit (102) produces an average value of the image pick-up signals covering one whole image on said sensing area.
Claim 21
Dependent Claim
35 words
The circuit according to anyone of Claims 11 to 14, wherein said average value detection circuit (102) produces an average value of the image pick-up signal at a substantial center part of said sensing area.
Claim 22
Dependent Claim
35 words
The circuit according to anyone of Claims 11 to 19, wherein said decision circuit (103) compares an output of said average value detection circuit (102) with an output of said peak value detection circuit (101).
Claim 23
Dependent Claim
209 words
A light signal control circuit for an image pick-up apparatus comprising: a distribution detection circuit (151) for detecting a frequency distribution in respect to brightness of a plurality of image pick-up signals corresponding to respective brightness of a plurality of regions into which a sensing area has been divided; a decision circuit (152) for producing a first signal corresponding to a distribution condition of the frequency distribution; an average value detection circuit (102) for detecting a substantial average value of image pick-up signals corresponding to the brightness of said sensing area and producing a second signal corresponding to the substantial average value; a peak value detection circuit (101) for detecting a substantial peak value of the image pick-up signals and producing a third signal corresponding to the substantial peak value; a weighting circuit (104) for producing a fourth signal obtained by applying predetermined weighting factors respectively to the second signal and the third signal on the basis of the first signal and adding up the weighted second signal and the weighted third signal; control means for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of the fourth signal outputted from the weighting circuit (104).
Claim 24
Dependent Claim
209 words
A light signal control circuit for an image pick-up apparatus comprising: a distribution detection circuit (151) for detecting a frequency distribution in respect to brightness of a plurality of image pick-up signals corresponding to respective brightness of a plurality of regions into which a sensing area has been divided; a decision circuit (152) for producing a first signal corresponding to a distribution condition of the frequency distribution; an average value detection circuit (102) for detecting a substantial average value of image pick-up signals corresponding to the brightness of said sensing area and producing a second signal corresponding to the substantial average value; a peak value detection circuit (101) for detecting a substantial peak value of the image pick-up signals and producing a third signal corresponding to the substantial peak value; a weighting circuit (104) for producing a fourth signal obtained by applying predetermined weighting factors respectively to the second signal and the third signal on the basis of the first signal and adding up the weighted second signal and the weighted third signal; control means for controlling a magnitude of a light signal to be sensed; and a drive circuit (8) for driving said control means on the basis of the fourth signal outputted from the weighting circuit (104).
Claim 25
Dependent Claim
32 words
The circuit according to Claim 21, wherein said peak value detection circuit (101) produces an average value of a predetermined number of frequencies in the highest brightness range of said frequency distribution.
Claim 26
Dependent Claim
27 words
The circuit according to Claim 21 or 22, wherein said average value detection circuit (102) produces an average value of all the frequencies of the frequency distribution.
Claim 27
Dependent Claim
53 words
The circuit according to Claim 21, wherein said peak value detection circuit (101) produces an average value of a predetermined number of frequencies in the higher brightness range of the frequency distribution, and said average value detection circuit (102) produces an average value of frequencies whose number is more than the predetermined number.
Claim 28
Dependent Claim
48 words
The circuit according to Claim 21 or 22, wherein said average value detection circuit (102) produces an average value of a predetermind number of frequencies belonging to a part of the frequency distribution excluding a predetermined number of frequencies in the highest brightness range of the frequency distribution.
Claim 29
Dependent Claim
65 words
The circuit according to Claim 21, wherein said average value detection circuit (102) multiplies an average value of a predetermined number of frequencies in the lowest brightness range of the frequency distribution by a predetermined multiplier, and produces an average value of a predetermined number of frequencies belonging to a part of the frequency distribution excluding frequencies having values greater than the multiplied average value.
Claim 30
Dependent Claim
60 words
The circuit according to anyone of Claims 21 to 26, wherein said decision circuit (152) divides the frequency distribution into two parts according to a predetermined frequency value, and decides a ratio between an average value of frequencies in the frequency distribution below the predetermined frequency value and an average of frequencies in the frequency distribution the predetermined frequency value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.