Image pickup apparatus that controls flash emission amount at photographing and control method therefor

An image pickup apparatus that enables photographing using a lighting device, comprising:

• a memory device that stores a set of instructions;
• and
• at least one processor that executes the set of instructions to:
• calculate reflection luminances of reflected light from an object at pre-emission of the lighting device;
• calculate ambient light luminances of the object under ambient light;
• detect a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculate a face ambient light luminance in the face area from the ambient light luminances;
• calculate a face reflection luminance in the face area from the reflection luminances;
• set an estimation luminance range in which the reflection luminances in the face area are estimated to be distributed in accordance with the reflection luminances;
• and
• determine an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance,
• wherein a contribution rate for calculating the face reflection luminance in a face area that is outside the estimation luminance range is reduced to be lower than that in a face area that is in the estimation luminance range in a case where a plurality of face areas are is detected.

An image pickup apparatus that enables photographing using a lighting device, comprising:

• a memory device that stores a set of instructions;
• and
• at least one processor that executes the set of instructions to:
• calculate reflection luminances of reflected light from an object at pre-emission of the lighting device;
• calculate ambient light luminances of the object under ambient light;
• detect a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculate a face ambient light luminance in the face area from the ambient light luminances;
• calculate a face reflection luminance in the face area from the reflection luminances;
• set an estimation luminance range in which the reflection luminances in the face area are estimated to be distributed in accordance with the reflection luminances;
• and
• determine an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance,
• wherein the face reflection luminance is calculated using the reflection luminances in the face area of a main face that is focused in a case where a plurality of the face areas is detected and the reflection luminances in the face area of the main face fall within the estimation luminance range, and
• wherein the face reflection luminance is calculated using the reflection luminances in a face area of a sub face other than the main face in a case where a plurality of the face areas is detected and the reflection luminances in the face area of the main face do not fall within the estimation luminance range.

An image pickup apparatus that enables photographing using a lighting device, comprising:

• a memory device that stores a set of instructions;
• and
• at least one processor that executes the set of instructions to:
• detect a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculate an average luminance in the face area from the image obtained at the pre-emission of the lighting device;
• calculate ambient light luminances of an object under ambient light;
• calculate a threshold for determining an abnormal luminance from the average luminance;
• determine the abnormal luminance using the threshold;
• replace a Bayer array that is determined to have the abnormal luminance with a Bayer array determined not to have the abnormal luminance;
• calculate a face reflection luminance from reflection luminances in the face area after replacement;
• calculate a face ambient light luminance in the face area from the ambient light luminances;
• and
• determine an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance.

A control method for an image pickup apparatus, the control method comprising:

• calculating reflection luminances of reflected light from an object at pre-emission of a lighting device;
• calculating ambient light luminances of the object under ambient light;
• detecting a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• dividing the face area into blocks;
• calculating a face reflection luminance from a weighted average of the reflection luminances of the blocks and first weights of the blocks;
• calculating a face ambient light luminance from a weighted average of the ambient light luminances of the blocks and second weights of the blocks;
• setting a predetermined luminance range in accordance with an average of reflection luminances of blocks corresponding to a limited area set in the face area among the blocks;
• and
• determining an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance,
• wherein the first weight of an abnormal luminance block of which a reflection luminance does not fall within the predetermined luminance range among the blocks is reduced to be lower than the first weight of a block other than the abnormal luminance block in the calculation of the face reflection luminance.

A control method for an image pickup apparatus, the control method comprising:

• calculating reflection luminances of reflected light from an object at pre-emission of a lighting device;
• calculating ambient light luminances of the object under ambient light;
• detecting a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculating a face ambient light luminance in the face area from the ambient light luminances;
• calculating a face reflection luminance in the face area from the reflection luminances;
• setting an estimation luminance range in which the reflection luminances in the face area are estimated to be distributed in accordance with the reflection luminances;
• and
• determining an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance,
• wherein a contribution rate for calculating the face reflection luminance of a face area that is outside the estimation luminance range is reduced to be lower than that of a face area that is in the estimation luminance range in a case where a plurality of face areas is detected.

A control method for an image pickup apparatus, the control method comprising:

• calculating reflection luminances of reflected light from an object at pre-emission of a lighting device;
• calculating ambient light luminances of the object under ambient light;
• detecting a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculating a face ambient light luminance in the face area from the ambient light luminances;
• calculating a face reflection luminance in the face area from the reflection luminances;
• setting an estimation luminance range in which the reflection luminances in the face area are estimated to be distributed in accordance with the reflection luminances;
• and
• determining an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance,
• wherein the face reflection luminance is calculated using the reflection luminances of the face area of a main face that is focused in a case where a plurality of the face areas is detected and the reflection luminances of the face area of the main face fall within the estimation luminance range, and
• wherein the face reflection luminance is calculated using the reflection luminances of a face area of a sub face other than the main face in a case where a plurality of the face areas is detected and the reflection luminances of the face area of the main face do not fall within the estimation luminance range.

A control method for an image pickup apparatus, the control method comprising:

• detecting a face area from one of an image obtained under the ambient light and an image obtained at the pre-emission of the lighting device;
• calculating an average luminance in the face area from the image obtained at the pre-emission of the lighting device;
• calculating ambient light luminances of the object under ambient light;
• calculating a threshold for determining an abnormal luminance from the average luminance;
• determining the abnormal luminance using the threshold;
• replacing a Bayer array that is determined to have the abnormal luminance with a Bayer array determined not to have the abnormal luminance;
• calculating a face reflection luminance from reflection luminances in the face area after replacement;
• calculating a face ambient light luminance in the face area from the ambient light luminances;
• and
• determining an emission amount of the lighting device for main photographing using the face reflection luminance and the face ambient light luminance.