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US 7,924,343 B2Granted
Photographing apparatus and exposure control method
AssigneeFUJIFILM Corporation
InventorAkihiro Uchida
Life of this patent
Estimating the term…
Abstract
A photographing apparatus comprises a photographing device which photographs an image of an object; an illumination device which emits light at the photographing time and illuminates the object; a face detection device which detects a face area and a size of the face area of the person of the object from the image photographed by the photographing device; an object distance calculating device which calculates a distance up to the object from the size of the face area; a photographing sensitivity setting device that sets a photographing sensitivity according to the object distance; and a main emission control device which performs a main emission photographing by using the setting of the photographing sensitivity set by the photographing sensitivity setting device.
Claims10
A photographing apparatus, comprising:
- a photographing device which photographs an image of an object;
- an illumination device which emits light at the photographing time and illuminates the object;
- a face detection device which detects a face area and a size of the face area of the person of the object from the image photographed by the photographing device;
- an object distance calculating device which calculates an object distance to the object from the photographing device based on the size of the face area;
- a photographing sensitivity setting device which sets a photographing sensitivity according to the calculated object distance;
- a pre-emission control device which performs a pre-emission to illuminate the object by the illumination device and performs a pre-emission photographing by the photographing device with the set photographing sensitivity;
- and
- a main emission control device which performs the main emission photographing by controlling an exposure based on a pre-emission image obtained by the pre-emission photographing.
5 more elements
An exposure control method, comprising the steps of:
- photographing an image of an object by a photographing apparatus;
- detecting a face area and a size of the face area of the person of the object from an image photographed in the photographing process;
- calculating an object distance to the object from the photographing apparatus based on a size of the face area;
- setting a photographing sensitivity according to the calculated object distance;
- performing a pre-emission to illuminate the object by an illumination device of the photographing apparatus and performing a pre-emission photographing with the set photographing sensitivity;
- and
- performing the main emission photographing by controlling an exposure based on a pre-emission image obtained by the pre-emission photographing.
4 more elements
A photographing apparatus, comprising:
- a photographing device which photographs an image of an object;
- an illumination device which emits light at the photographing time and illuminates the object;
- a face detection device which detects a face area and a size of the face area of the person of the object from the image photographed by the photographing device;
- an object distance calculating device which calculates an object distance to the object from the photographing device based on the size of the face area;
- a photographing sensitivity setting device which sets a photographing sensitivity according to the calculated object distance;
- and
- a main emission control device which performs a main emission photographing by using a setting of the photographing sensitivity set by the photographing sensitivity setting device, wherein
- the object distance calculating device obtains a reference distance Lz and a ratio Pz of an average sized face at the reference distance to a field view of an image corresponding to a zoom position of the photographing device, and calculates the object distance L based on a vertical ratio P of the detected face area to the field view of an image by a formula:
- L=(Pz/P)*Lz.
6 more elements
A photographing apparatus, comprising:
- a photographing device which photographs an image of an object;
- an illumination device which emits light at the photographing time and illuminates the object;
- a face detection device which detects a face area and a size of the face area of the person of the object from the image photographed by the photographing device;
- an object distance calculating device which calculates an object distance to the object from the photographing device based on the size of the face area;
- a photographing sensitivity setting device which sets a photographing sensitivity according to the calculated object distance;
- a pre-emission control device which performs a pre-emission to illuminate the object by the illumination device and performs a pre-emission photographing by the photographing device with the set photographing sensitivity;
- and
- a main emission control device which performs the main emission photographing by controlling an exposure based on a pre-emission image obtained by the pre-emission photographing, wherein
- the object distance calculating device obtains a reference distance Lz and a ratio Pz of an average sized face at the reference distance to a field view of an image corresponding to a zoom position of the photographing device, and calculates the object distance L based on a vertical ratio P of the detected face area to the field view of an image by a formula:
- L=(Pz/P)*Lz.
7 more elements
An exposure control method, comprising the steps of:
- photographing an image of an object by a photographing apparatus;
- detecting a face area and a size of the face area of the person of the object from an image photographed in the photographing process;
- calculating an object distance to the object from the photographing apparatus based on a size of the face area;
- setting a photographing sensitivity according to the calculated object distance;
- and
- performing the main emission photographing by using the setting of the photographing sensitivity set in the photographing sensitivity setting step, wherein
- the calculating step includes the steps of:
- obtaining a reference distance Lz and a ratio Pz of an average sized face at the reference distance to a field view of an image corresponding to a zoom position of the photographing device;
- and
- calculating the object distance L based on a vertical ratio P of the detected face area to the field view of an image by a formula:
- L=(Pz/P)*Lz.
8 more elements
An exposure control method, comprising the steps of:
- photographing an image of an object by a photographing apparatus;
- detecting a face area and a size of the face area of the person of the object from an image photographed in the photographing process;
- calculating an object distance to the object from the photographing apparatus based on a size of the face area;
- setting a photographing sensitivity according to the calculated object distance;
- performing a pre-emission to illuminate the object by an illumination device of the photographing apparatus and performing a pre-emission photographing with the set photographing sensitivity;
- and
- performing the main emission photographing by controlling an exposure based on a pre-emission image obtained by the pre-emission photographing, wherein
- the calculating step includes the steps of:
- obtaining a reference distance Lz and a ratio Pz of an average sized face at the reference distance to a field view of an image corresponding to a zoom position of the photographing device;
- and
- calculating the object distance L based on a vertical ratio P of the detected face area to the field view of an image by a formula:
- L=(Pz/P)*Lz.
9 more elements
Dependencies are inferred from the claim text.