Image-pickup device, method for controlling image-pickup device, program of method for controlling image-pickup device, and recording medium having recorded program of method for controlling image-pickup device thereon

A method for controlling an image-pickup device,

• the image-pickup device including,
• a light-emitting unit configured to emit illuminating light to an object,
• an image-pickup unit configured to photograph the object,
• a brightness detection unit configured to detect an evaluation value indicating brightness of the object, and
• a control unit configured to control, on the basis of the evaluation value detected by the brightness detection unit, an amount of light that the light-emitting unit is to emit,
• the method for controlling the image-pickup device comprising the steps of:
• obtaining an evaluation value in a case of no emission that is detected by the brightness detection unit in a state in which the light-emitting unit is not caused to emit light;
• detecting brightness of the object in the state in which the light-emitting unit is not caused to emit light, thereby detecting the brightness of the object in a case of no-emission;
• obtaining an evaluation value in a case of pre-emission that is detected by the brightness detection unit in a case in which the light-emitting unit is caused to perform pre-emission;
• calculating, on the basis of an amount of light emitted from the light-emitting unit in a case of pre-emission, an amount of light to be emitted in a case of main emission that is a case in which the light-emitting unit is to be caused to perform main emission by using the evaluation value in a case of no emission, the evaluation value in a case of pre-emission, and a target value for the evaluation values;
• correcting the amount of light to be emitted in a case of main emission by multiplying the amount of light to be emitted in a case of main emission by a correction coefficient whose value monotonically decreases in accordance with an increase in the brightness of the object in a case of no emission;
• and
• causing the light-emitting unit to perform main emission in order to achieve the amount of light to be emitted in a case of main emission that has been corrected in the correcting.

A program of a method for controlling an image-pickup device,

• the image-pickup device including,
• a light-emitting unit configured to emit illuminating light to an object,
• an image-pickup unit configured to photograph the object,
• a brightness detection unit configured to detect an evaluation value indicating brightness of the object, and
• a control unit configured to control, on the basis of the evaluation value detected by the brightness detection unit, an amount of light that the light-emitting unit is to emit,
• the program comprising the steps of:
• obtaining an evaluation value in a case of no emission that is detected by the brightness detection unit in a state in which the light-emitting unit is not caused to emit light;
• detecting brightness of the object in the state in which the light-emitting unit is not caused to emit light, thereby detecting the brightness of the object in a case of no-emission;
• obtaining an evaluation value in a case of pre-emission that is detected by the brightness detection unit in a case in which the light-emitting unit is caused to perform pre-emission;
• calculating, on the basis of an amount of light emitted from the light-emitting unit in a case of pre-emission, an amount of light to be emitted in a case of main emission that is a case in which the light-emitting unit is to be caused to perform main emission by using the evaluation value in a case of no emission, the evaluation value in a case of pre-emission, and a target value for the evaluation values;
• correcting the amount of light to be emitted in a case of main emission by multiplying the amount of light to be emitted in a case of main emission by a correction coefficient whose value monotonically decreases in accordance with an increase in the brightness of the object in a case of no emission;
• and
• causing the light-emitting unit to perform main emission in order to achieve the amount of light to be emitted in a case of main emission that has been corrected in the correcting.

A recording medium on which a program of a method for controlling an image-pickup device is recorded,

• the image-pickup device including,
• a light-emitting unit configured to emit illuminating light to an object,
• an image-pickup unit configured to photograph the object,
• a brightness detection unit configured to detect an evaluation value indicating brightness of the object, and
• a control unit configured to control, on the basis of the evaluation value detected by the brightness detection unit, an amount of light that the light-emitting unit is to emit,
• the program comprising the steps of:
• obtaining an evaluation value in a case of no emission that is detected by the brightness detection unit in a state in which the light-emitting unit is not caused to emit light;
• detecting brightness of the object in the state in which the light-emitting unit is not caused to emit light, thereby detecting the brightness of the object in a case of no-emission;
• obtaining an evaluation value in a case of pre-emission that is detected by the brightness detection unit in a case in which the light-emitting unit is caused to perform pre-emission;
• calculating, on the basis of an amount of light emitted from the light-emitting unit in a case of pre-emission, an amount of light to be emitted in a case of main emission that is a case in which the light-emitting unit is to be caused to perform main emission by using the evaluation value in a case of no emission, the evaluation value in a case of pre-emission, and a target value for the evaluation values;
• correcting the amount of light to be emitted in a case of main emission by multiplying the amount of light to be emitted in a case of main emission by a correction coefficient whose value monotonically decreases in accordance with an increase in the brightness of the object in a case of no emission;
• and
• causing the light-emitting unit to perform main emission in order to achieve the amount of light to be emitted in a case of main emission that has been corrected in the correcting.