Canon Kabushiki Kaisha

Tomohiko Ishibashi

Kazue Uchida

Satoshi Maetaki

Rie Ishimatsu

An image processing apparatus includes a memory storing instructions, and a processor configured to execute the instructions to acquire first image information acquired by imaging using a polarization element configured to transmit lights with a plurality of polarization azimuths that are different from each other, determine whether a luminance of at least part of the first image information becomes higher than a threshold, and acquire polarization information using the first image information and a determination result. A predetermined condition is satisfied.

Image processing apparatus, image pickup apparatus, image processing method, and storage medium

An image processing apparatus includes at least one processor, and a memory coupled to the at least one processor, the memory storing instructions that, when executed by the processor, perform operations as a first acquiring unit, a second acquiring unit, a setting unit, and a third acquiring unit. The first acquiring unit is configured to acquire a first image generated by imaging an object via a polarizing element configured to transmit lights having a plurality of polarization azimuths different from each other. The second acquiring unit is configured to acquire information on an imaging condition in the imaging. The setting unit is configured to set information on a polarization azimuth in the first image according to the information on the imaging condition. The third acquiring unit is configured to acquire polarization information from the first image using the information on the polarization azimuth.

Image processing apparatus, image pickup apparatus, and image processing method for acquiring polarization information

An optical system includes an aperture stop, a first optical element disposed on one of an object side and an image side of the aperture stop, and a second optical element disposed on the other of the object side and the image side. Each of the first optical element and the second optical element includes an area in which a transmittance changes in a direction perpendicular to an optical axis. The following conditional expressions are satisfied:0.60≤|1/1|<|2/2|≤1.40,0.40≤1(1)/2(2)<0.98, and0.30≤2×1/φ1≤0.70.

Optical system and optical apparatus including the same

The disclosed optical filter is provided on a substrate. The optical filter includes a first layer, an absorption layer, and a second layer in order from a substrate side. The condition of |R1−R2|≥10 is satisfied where R1 [%] represents a reflectance of the optical filter for light whose wavelength is 550 nm and that makes incident on the optical filter from a side opposite to the substrate, and R2 [%] represents a reflectance of the optical filter for light whose wavelength is 550 nm and that makes incident on the optical filter from the substrate side.

Optical filter having differing reflectance depending on light incident side

An optical element having an area in which a transmittance changes in a first direction, the optical element includes a substrate and a first layer in a second direction orthogonal to the first direction. A thickness of the first layer in the second direction changes in the first direction, and the extinction coefficient of the first layer changes in the first direction. A predetermined conditional expression is satisfied.

Optical element, optical system, and imaging apparatus

An optical system of the present invention includes a plurality of lenses inclusive of an aspheric lens having an aspheric surface. A light absorption portion having thickness distribution in a direction perpendicular to an optical axis of the optical system is provided on the optical axis. Here, a refractive index of the aspheric lens, a refractive index of the light absorption portion, an aspheric sag amount of the aspheric lens, an aspheric sag amount of the light absorption portion, a height of a position in the aspheric lens through which a marginal ray of an axial ray passes, and a height of a position in the light absorption portion through which the marginal ray of the axial ray passes are each appropriately set.

Optical system and optical apparatus including same

An optical system includes an optical element made of resin and a reflection portion configured to reflect ultraviolet radiation. The reflection portion is provided on an optical surface located closer to an object side than the optical element, and conditional expressions 0.10&#x2264;Lu/L&#x2264;0.90 and |tan(H0/Lr)&#x2212;tan{H0(Lr&#x2212;Lu)/(Ru&#xd7;Lr)}|&#x2264;25&#xb0; are satisfied, in which H0 represents a maximum height, from an optical axis, of an optical surface closest to the object side, Lu represents a distance from the optical surface closest to the object side to the reflection portion, Lr represents a distance from the optical surface closest to the object side to the optical element, L represents a total length of the optical system, and Ru represents a radius of curvature of the optical surface on which the reflection portion is provided.

An optical device including first and second optical elements formed of mutually different materials, and a bonding member bonding the first and second optical elements to each other, wherein the following conditional expression is satisfied:0.14&#x3c;Log()&#xd7;Log(1&#xd7;2/)&#x3c;5.0where tc is a thickness in an optical axis direction of the bonding member on an optical axis, te is a thickness in the optical axis direction of the bonding member in a maximum diameter of interfaces between the first and second optical elements and the bonding member, and E1, E2, and Ec are respective Young's moduli of the first and second optical elements and the bonding member.

Optical device and optical apparatus having the same

An optical system includes an aperture diaphragm, a first optical element disposed on a light incident side of the aperture diaphragm, and a second optical element disposed on a light emission side of the aperture diaphragm. Transmittance distribution of the first optical element satisfies a predetermined conditional expression. Transmittance distribution of the second optical element satisfies a predetermined conditional expression.

Optical system and optical apparatus incorporating the same

Provided is an optical system including, in order from an object side to an image side, a first lens unit and a second lens unit with a positive refractive power. One of lenses of the first lens unit is the closest to the object side and has a negative refractive power. The second lens unit includes an aperture diaphragm. One of lenses that is included in the second lens unit, located on the object side or the image side of the aperture diaphragm and the closest to the aperture diaphragm has a concave lens surface that faces the aperture diaphragm. Conditions are satisfied whose values are set by using refractive indexes of a negative lens and a positive lens of the first lens unit that respectively have the smallest Abbe number.

Optical system, and optical apparatus including the same

The optical system includes first (positive) and second (negative) lens units arranged in order from an object side to an image side, and an aperture stop disposed further on the image side than the second lens unit. The first lens unit includes at least one first optical element satisfying &#x3c6;GH&#x3e;0.0, &#x3bd;dGH&#x3c;39.5 and ndGH&#x3e;1.70. The optical system satisfies 0.65&#x3c;|&#x3c6;|&#x3c;6.00 and 0.45&#x3c;|&#x3a3;&#x3c6;GH&#xd7;&#x3c6;|&#x3c;4.00. &#x3c6;GH represents a refractive power of the first optical element when light-entrance and light-exit surfaces thereof are in contact with air, &#x3bd;dGH and ndGH respectively represent an Abbe number and a refractive index of a material forming the first optical element for a d-line, &#x3c6;and &#x3c6;respectively represent the refractive powers of the first lens unit and the second lens unit, and &#x3a3;&#x3c6;GH represents a sum total of the refractive power &#x3c6;GH of the at least one first optical element.

Optical system and optical apparatus

A compound lens comprises three or more optical elements, including first, second, and third optical components, that are cemented together. The material of the second optical element is an organic composite material. The first optical element is cemented to one surface of the second optical element. The third optical element is disposed remotest from the first optical element in an optical axis. The diameters of effective areas of the first optical element on the cemented surface between the first and the second optical elements, and of the second optical element, and the distance ti(&#x3c6;) between optically effective surfaces of the i-th optical element (i=1, 2, 3) along the optical axis at diameter &#x3c6; are appropriately designed. The second optical element has such a shape that the decrease in the distance between its optically effective surfaces is small in a region outside the effective surface area.

Compound lens and optical system including the same

Optical element having refractive index distribution and optical apparatus

An optical system includes a first optical element and a second optical element on at least one of an enlargement side and a reduction side relative to a point P at which a light axis and a paraxial chief ray intersect. Each of the first optical element and second optical element is composed of a solid material having a refractive light incident surface and a refractive light emergent surface. The optical system satisfies the following conditional expressions: &#x394;&#x3b8;gF&#x3e;0.0272, &#x394;&#x3b8;gF&#x3c;&#x2212;0.0278, and f&#xd7;f&#x3c;0 where &#x394;&#x3b8;gFand &#x394;&#x3b8;gFdenote anomalous partial dispersion values of the first and second optical elements for the g-line and F-line, respectively, and fand fdenote focal lengths of the first and second optical elements, respectively, when the light incident surfaces and the light emergent surfaces of the first and second optical elements are in contact with air.

Optical system and optical apparatus including optical system

A cemented lens comprises first, second and third optical elements respectively formed by different solid materials, the third and first optical elements being cemented to each other, and the first and the second optical elements being cemented to each other, wherein both an incident surface and an exit surface of the first and second optical elements are refracting surfaces, and the following conditional expressions are satisfied:|&#x394;&#x3b8;1|&#x3e;0.0272|&#x394;&#x3b8;2|&#x3e;0.0272&#x394;&#x3b8;1&#xd7;&#x394;&#x3b8;2&#x3c;0&#x3c6;1&#xd7;&#x3c6;&#x3c;0where &#x394;&#x3b8;gFand &#x394;&#x3b8;gFare respectively anomalous dispersion characteristics of the materials for the first and the second optical elements with respect to a g line and an F line, and &#x3c6;and &#x3c6;are respectively refracting powers of the first and second optical elements when both the incident surface and the exit surface of the first and the second optical element are surfaces in contact with air.

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Utsunomiya, Japan

Tomohiko Ishibashi