Object detection apparatus and method therefor

An object detection apparatus comprising:

• a first detection unit configured to detect a first portion of an object from an input image;
• a second detection unit configured to detect a second portion different from the first portion of the object from the input image;
• a first estimation unit configured to estimate a third portion of the object based on the first portion when the first detection unit detects the first portion;
• a second estimation unit configured to estimate a third portion of the object based on the second portion when the second detection unit detects the second portion;
• a determination unit configured to determine whether the third portions, which have been respectively estimated by the first and second estimation units, match each other;
• and
• an output unit configured to output, if the determination unit determines that the third portions match each other, a detection result of the object based on at least one of a detection result of the first or second detection unit and an estimation result of the first or second estimation unit.