JP2001145117A5

JP2001145117A5 -

Info

Publication number: JP2001145117A5
Application number: JP1999325685A
Authority: JP
Filing date: 1999-11-16
Publication date: 2005-05-26
Anticipated expiration: 2019-11-16

Claims

An electronic imaging device including a plurality of pixels having three or more different spectral characteristics for obtaining a color image;
An imaging optical system that generates chromatic aberration and forms a subject image on an imaging surface of the electronic imaging device;
A high luminance difference detecting means for detecting the presence or absence of a region where the luminance difference between adjacent pixels of the electronic image sensor becomes a certain level or more;
An electronic imaging apparatus comprising: a warning unit that issues a warning when the high luminance difference detection unit detects a luminance difference of a certain level or more.

An electronic imaging device that includes a plurality of pixels having three or more different spectral characteristics for obtaining a color image, converts an image received by the pixel into an electrical signal including luminance and color information, and outputs the electrical signal;
An imaging optical system that generates chromatic aberration and forms a subject image on an imaging surface of the electronic imaging device;
A high-luminance difference boundary detection means for detecting a boundary where the luminance difference between adjacent pixels of the electronic image sensor is a certain level or more;
When the high-luminance difference boundary detection unit detects a luminance difference of a certain level or more, the luminance and color information is reduced so that color flare due to the chromatic aberration near the boundary including the luminance difference of the certain level or more is reduced. An electronic imaging apparatus comprising: a signal processing unit that electrically adjusts an electrical signal that is included.

An electronic imaging device that includes a plurality of pixels having three or more different spectral characteristics for obtaining a color image, converts an image received by the pixel into an electrical signal including luminance and color information, and outputs the electrical signal;
An imaging optical system that generates chromatic aberration and forms a subject image on an imaging surface of the electronic imaging device;
A proper exposure calculating means for calculating a proper exposure value of a photographing region on the electronic image sensor;
High luminance for detecting a boundary portion having a large luminance difference by detecting a pixel whose exposure level is saturated by underexposure of 2 EV or less with respect to the appropriate exposure and / or a non-saturated pixel adjacent to the saturated pixel. A difference boundary detection means;
Signal processing means for electrically adjusting an electrical signal including the luminance and color information so as to reduce color flare due to the chromatic aberration in the vicinity of the boundary detected by the high-luminance difference boundary detection means. An electronic imaging apparatus characterized by that.

The electronic imaging apparatus according to claim 2, wherein a two-dimensional area photometric sensor is used as the high luminance difference boundary detection unit.

4. The boundary portion is detected by providing a plurality of pixels subjected to sensitivity reduction means on an image pickup surface of the electronic image pickup device, and using a light reception signal at the pixels. Electronic imaging device.

The electronic imaging apparatus according to claim 5, wherein an ND filter is used as the sensitivity lowering unit.

4. The electronic image pickup apparatus according to claim 2, wherein the signal processing means reduces color blur by reducing the saturation of the video near the boundary.

The electronic image pickup apparatus according to claim 7, wherein a region in which the saturation is decreased is set to be 1 pixel or more and 50 pixels or less in the vertical and horizontal directions from the boundary portion.

The signal processing means approximates the chromaticity of the boundary portion and the boundary portion of the dark portion side adjacent to the boundary portion and having a low luminance to the chromaticity of a dark portion that is a certain pixel or more away from the boundary portion to the dark portion side. The electronic image pickup apparatus according to claim 2, wherein color blur is reduced.

The electronic imaging apparatus according to claim 9, wherein an area in which the chromaticity is approximated is 2 pixels or more and 50 pixels or less from the boundary portion to the dark portion side.

The imaging optical system generating chromatic aberration has a minimum pixel pitch of P and a minimum F value of the electronic image sensor. Fmin And F value is Fmin Wavelength when 404.7nm The absolute value of the spherical aberration of the marginal ray L h, wavelength 587.56nm Of spherical aberration of marginal ray at The L When d, the following conditional expression (1) The electronic imaging device according to claim 1, wherein:
( L h- L d) / Fmin ≧ 2P ... (1)

The imaging optical system that generates chromatic aberration has a wavelength at which the minimum pixel pitch of the electronic image sensor is P and the image height ratio of the maximum image height is 0.9, 0.7, or 0.5 587.56nm Wavelength for 404.7nm When the lateral aberration amount of the magnification color is Sh, the following conditional expression (2) The electronic imaging device according to claim 1, wherein the electronic imaging device satisfies the following.
| Sh | ≧ 2P ... (2)

An electronic imaging device including a plurality of pixels having three or more different spectral characteristics for obtaining a color image, and a mount unit capable of connecting an imaging optical system for forming a subject image on an imaging surface of the electronic imaging device; High-intensity difference detection means for detecting the presence or absence of a region where the luminance difference between adjacent pixels of the electronic image sensor is a certain level;
An electronic imaging apparatus comprising: a warning unit that issues a warning when the high luminance difference detection unit detects a luminance difference of a certain level or more.

An electronic imaging device that includes a plurality of pixels having three or more different spectral characteristics for obtaining a color image, converts an image received by the pixel into an electrical signal including luminance and color information, and outputs the electrical image; A mount part that enables connection of an imaging optical system that forms a subject image on the imaging surface of the element, and a boundary part that detects a boundary where the luminance difference between certain adjacent pixels of the electronic imaging element exceeds a certain level. The luminance difference boundary detection unit and the high luminance difference boundary detection unit detect the luminance flare in the vicinity of the boundary including the luminance difference of the predetermined level or more when the luminance difference boundary detection unit detects the luminance difference of the specific level or more. And an electronic image pickup apparatus comprising: a signal processing unit that electrically adjusts an electric signal including color information.

An electronic imaging device that includes a plurality of pixels having three or more different spectral characteristics for obtaining a color image, converts an image received by the pixel into an electrical signal including luminance and color information, and outputs the electrical image; A mount unit capable of connecting an imaging optical system for forming a subject image on the imaging surface of the element, an appropriate exposure calculating means for calculating an appropriate exposure value of a shooting area on the electronic image sensor, and the appropriate exposure High luminance difference boundary detection means for detecting a boundary with a large luminance difference by detecting a pixel whose exposure level is saturated by underexposure of 2 EV or less and / or a non-saturated pixel adjacent to the saturated pixel; And a signal processing means for electrically adjusting an electric signal including the luminance and color information so as to reduce color flare in the vicinity of the boundary detected by the high luminance difference boundary detection means. Electronic imaging apparatus according to claim and.

An imaging optical system for forming a subject image on an electronic imaging device, wherein the minimum F value of the optical system is Fmin And F value is Fmin Is the absolute value of the spherical aberration of the marginal ray of any wavelength λ L λ, wavelength 587.56nm The absolute value of the spherical aberration of the marginal ray at L The following conditional expression when d (3)
( L λ− L d) / Fmin = 0.05mm ... (3)
Where λ1 is the wavelength when the wavelength satisfying 587.56nm It exists in the following wavelength range, and the transmittance is the wavelength. 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (Four) An imaging optical system characterized by exhibiting characteristics satisfying
λ 1 ≦ λ c ≦ 587.56nm ... (Four)

An imaging optical system for forming a subject image on an electronic imaging device, a wavelength at an image height ratio of 0.9 at a maximum image height at an arbitrary wavelength λ 587.56nm When the lateral aberration amount of the chromaticity with respect to is Sλ, the following conditional expression (Five)
| Sλ | = 0.025mm (Five)
Where λ2 is the wavelength when the wavelength satisfying 587.56nm It exists in the following wavelength range, and the transmittance is the wavelength. 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (6) An imaging optical system characterized by exhibiting characteristics satisfying
λ 2 ≦ λ c ≦ 587.56nm ... (6)

An imaging optical system for forming a subject image on an electronic imaging device, wherein the minimum F value of the optical system is Fmin And F value is Fmin Spherical aberration of marginal ray of arbitrary wavelength λ The absolute value of the quantity L λ, wavelength 587.56nm The absolute value of the spherical aberration of the marginal ray at L The following conditional expression when d (3)
( L λ− L d) / Fmin = 0.05mm (3)
Where λ1 is the following conditional expression (8) And the transmittance is wavelength 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (7) An imaging optical system characterized by exhibiting characteristics satisfying
390nm ≦ λc ≦ 440nm ・・・・ (7)
390nm ≦ λ1 ≦ 430nm ・・・・ (8)

An imaging optical system for forming a subject image on an electronic imaging device, a wavelength at an image height ratio of 0.9 at a maximum image height at an arbitrary wavelength λ 587.56nm When the lateral aberration amount of the chromaticity with respect to is Sλ, (Five)
| Sλ | = 0.025mm (Five)
Where λ2 is a wavelength satisfying (7) And the transmittance is wavelength 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (9) An imaging optical system characterized by exhibiting characteristics satisfying
390nm ≦ λc ≦ 440nm ・・・・ (7)
390nm ≦ λ2 ≦ 430nm ・・・・ (9)

An imaging optical system for forming a subject image on an electronic imaging device, wherein the minimum F value of the optical system is Fmin And F value is Fmin Is the absolute value of the spherical aberration of the marginal ray of any wavelength λ L λ, wavelength 587.56nm The absolute value of the spherical aberration of the marginal ray at L The following conditional expression when d (3)
( L λ L d) / Fmin = 0.05mm (3)
Where λ1 is the wavelength satisfying (Ten) Satisfy the wavelength 587.56nm The transmittance ratio of the optical system at the wavelength λ1 to the transmittance of τ (λ1), the wavelength 587.56nm When the transmittance ratio of the optical system at the wavelength λ1 + 30 nm to the transmittance of τ is τ (λ1 + 30), the following conditional expression (11) , (12) An imaging optical system characterized by exhibiting characteristics satisfying
350nm ≦ λ1 ≦ 550nm ... (Ten)
τ (λ1) ≦ 10% ・・・・ (11)
τ (λ1 + 30) ≧ 50% ・・・・ (12)

An imaging optical system for forming a subject image on an electronic imaging device, a wavelength at an image height ratio of 0.9 at a maximum image height at an arbitrary wavelength λ 587.56nm When the lateral aberration amount of the chromaticity with respect to is Sλ, the following conditional expression (Five)
| Sλ | = 0.025mm ... (Five)
Where λ2 is the wavelength that satisfies (13) Satisfy the wavelength 587.56nm The transmittance ratio of the optical system at the wavelength λ2 to the transmittance of τ (λ2), the wavelength 587.56nm When the transmittance ratio of the optical system at the wavelength λ2 + 30 nm to the transmittance of τ is τ (λ2 + 30), the following conditional expression (14) , (15) An imaging optical system characterized by exhibiting characteristics satisfying
350 nm ≤ λ2 ≦ 550nm ・・・・ (13)
τ (λ2) ≦ 10% ・・・・ (14)
τ (λ2 + 30) ≧ 50% ・・・・ (15)

Conditional expression above (3) The following formula (3 ') 21. The imaging optical system according to claim 16, wherein the imaging optical system is replaced with.
( L λ− L d) / Fmin = 0.04mm ・・・・ (3 ')

Conditional expression above (3) The following conditional expression (3``) 21. The imaging optical system according to claim 16, wherein the imaging optical system is replaced with.
( L λ− L d) / Fmin = 0.03mm ・・・・ (3``)

Conditional expression above (Five) The following conditional expression (Five') The imaging optical system according to any one of claims 17, 19 and 21, wherein the imaging optical system is replaced with.
| Sλ | = 0.02mm (Five')

Conditional expression above (Five) The following conditional expression (Five'') Characterized by the replacement of The imaging optical system according to any one of claims 17, 19 and 21.
| Sλ | = 0.015mm (Five'')

An imaging optical system for forming a subject image on an electronic imaging device, wherein the minimum F value of the imaging optical system is Fmin And F value is Fmin Wavelength when 404.7nm The absolute value of the spherical aberration of the marginal ray L h, wavelength 435.8nm The absolute value of the spherical aberration of the marginal ray L g, wavelength 587.56nm The absolute value of the spherical aberration of the marginal ray L d, wavelength 587.56nm The wavelength of the imaging optical system with respect to the transmittance of 404.7nm The transmittance ratio of τh, wavelength 587.56nm Wavelength with respect to transmittance 435.8nm When the transmittance ratio is τg, the following conditional expression (16) And the transmittance is wavelength 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (17) An imaging optical system characterized by exhibiting characteristics satisfying
( Lh − Ld ) / F min × τ h ≤ ( Lg − Ld ) / F min × τ g ... (16)
404.7nm < λ c < 435.8nm ... (17)

An imaging optical system for forming a subject image on an electronic imaging device, the wavelength at a maximum image height ratio of 0.9 587.56nm Wavelength for 404.7nm Is the wavelength at the image height ratio of 0.9, the amount of lateral aberration of the magnification color of the lens is Sh 587.56nm Wavelength for 435.8nm Is the lateral aberration amount of the magnification color of Sg, wavelength 587.56nm Wavelength of the imaging optical system with respect to 404.7nm The transmittance ratio of τh, wavelength 587.56nm Wavelength for 435.8nm When the transmittance ratio is τg, the following conditional expression (18) And the transmittance is wavelength 587.56nm Wavelength λ that is half of the transmittance of c Is the following conditional expression (17) An imaging optical system characterized by exhibiting characteristics satisfying
｜ Sh ｜ × τh ≦ | Sg | × τg (18)
404.7nm < λ c < 435.8nm ... (17)

The imaging optical system according to any one of claims 16 to 27, wherein a coating film for performing wavelength correction is provided on a plane.

28. The imaging optical system according to claim 16, wherein a low-pass filter is disposed in the imaging optical system, and a coating film for performing wavelength correction is applied to at least one surface of the low-pass filter.

17. An infrared cut filter for reducing an infrared light component is disposed in the imaging optical system, and a coating film for performing wavelength correction is applied to at least one surface of the infrared cut filter. 27. The imaging optical system according to any one of 27.

wavelength 435.8nm And wavelength 404.7nm And 600nm When 700nm The transmittance is between 587.56nm The imaging optical system according to any one of claims 16 to 27, wherein a coating film exhibiting a characteristic in which a wavelength having a half value with respect to the transmittance is present is provided in the imaging optical system.

An optical path dividing means is provided in the optical path of the imaging optical system, and the wavelength of the electronic imaging device 435.8nm 28. A wavelength correction element is provided only in an optical path on an image pickup element side having an image pickup region having a sensitivity characteristic at 30% or more of the sensitivity characteristic at e-line. An imaging optical system according to claim 1.

The imaging optical system according to claim 32, wherein one of the optical paths divided by the optical path dividing unit is an observation optical path that guides the optical path to the eyeball of the observer.

The optical path dividing unit divides the optical path into a plurality of optical paths, and disposes an image sensor having different spectral sensitivity characteristics in each of the plurality of optical paths. 435.8nm 33. The imaging according to claim 32, wherein the wavelength correction element is disposed only in the optical path on the imaging element side having an imaging region in which the sensitivity characteristic at 30 has a sensitivity of 30% or more of the sensitivity characteristic at the e-line. Optical system.

An imaging optical system for forming a subject image on an electronic imaging device, comprising an adjustment element for adjusting a light amount in an optical path of the optical system, wherein the adjustment element has a wavelength 435.8nm And wavelength 404.7nm An imaging optical system having a wavelength correction function in which the transmittance between the two is half the transmittance of e-line.

36. The optical element related to determination of a focal length in the imaging optical system is configured by an optical element using only a refraction phenomenon. Imaging optical system.

37. The electronic imaging device having three or more different spectral sensitivity characteristics for obtaining a color image is disposed at a rear focal position of the imaging optical system. An electronic imaging apparatus having an imaging optical system.

Among the electronic imaging elements having three or more different spectral sensitivity characteristics for obtaining the color image, the spectral characteristics of at least one electronic imaging element have two high peak wavelengths, and the two peak wavelengths are between the two peak wavelengths. 38. The electronic imaging device according to claim 1, wherein the electronic imaging device has a wavelength with a sensitivity of 50% or less with respect to both of two peak wavelengths .