Image capture apparatus and method of controlling the same
A subject is tracked during continuous shooting, and the degree of reliability of the tracking result is determined. When it is determined that the degree of reliability of the tracking result is high, control values of exposure used to capture an image of the previous frame are configured as those used to capture an image of the next frame, thereby omitting calculation of control values of exposure. Upon this operation, in an image capture apparatus having a continuous shooting function, and a method of controlling the same, suppression of exposure variations and shortening of the exposure calculation time during continuous shooting can be effectively achieved.
1. An image capture apparatus capable of continuous shooting, comprising:
a configuring unit that configures a control value of exposure used to capture an image;
a tracking unit that tracks a subject; and
a determination unit that determines a degree of reliability of the tracking result obtained by said tracking unit,
wherein said tracking unit tracks the subject during continuous shooting, and
when said determination unit determines that the degree of reliability of the tracking result obtained by said tracking unit during the continuous shooting is high, said configuring unit configures a control value of exposure used to capture an image of the previous frame as a control value of exposure used to capture an image of the next frame.
2. The apparatus according to claim 1 , wherein when it is determined that one of a luminance and a color of the subject remains unchanged, said determination unit determines that the degree of reliability of the tracking result is high.
3. The apparatus according to claim 1 , wherein
said tracking unit tracks the subject by searching the captured image for an area having a high correlation of luminance information and color information with an image pattern, and
when a correlation value of the luminance information in the found area is not less than a threshold value of a correlation value of predetermined luminance information, and a correlation value of the color information in the found area is not less than a threshold of a correlation value of predetermined color information, said determination unit determines that the degree of reliability of the tracking result obtained by said tracking unit is high.
4. The apparatus according to claim 1 , further comprises a metering sensor,
wherein said tracking unit performs the tracking using an image captured by said metering sensor.
5. The apparatus according to claim 4 , wherein when said determination unit does not determine that the degree of reliability of the tracking result obtained by said tracking unit during the continuous shooting is high, said configuring unit calculates a required amount of exposure based on the image captured by said metering sensor, and configures a control value of exposure used to obtain the amount of exposure as a control value of exposure used to capture an image of the next frame.
6. A method of controlling an image capture apparatus capable of continuous shooting, comprising:
a tracking step of tracking a subject during continuous shooting;
a determination step of determining a degree of reliability of the tracking result obtained in the tracking step; and
a configuring step of configuring a control value of exposure used to capture an image of the next frame during the continuous shooting,
wherein when it is determined in the determination step that the degree of reliability of the tracking result obtained in the tracking step is high, in the configuring step a control value of exposure used to capture an image of the previous frame is configured as a control value of exposure used to capture an image of the next frame.