Target pickup device and target detection method

1. An image pickup device comprising:

an image pickup unit, which, in operation, captures a video image;

a mask area determination unit, which, in operation, determines a mask area, for which processing for detection of a characteristic part of a target is excluded, among a portion or entirety of an area of image data of the video image captured by the image pickup unit; and

a characteristic part detector, which, in operation, performs processing for detection of the characteristic part of the target on a detection target area obtained by excluding the mask area determined by the mask area determination unit from the portion or the entirety of the area of the image data of the video image captured by the image pickup unit,

the mask area determination unit including:

a target detector, which, in operation, detects the target in a portion or the entirety of the area of the image data of the video image captured by the image pickup unit,

a line statistical processor, which, in operation, generates a frequency distribution indicating a detection rate on a virtual line of the target detected by the target detector for each of a plurality of virtual lines which are set for the entire area of the image data, and

a mask area extractor, which, in operation, extracts the mask area from the portion or the entirety of the area of the image data based on the frequency distribution for each of the plurality of virtual lines generated by the line statistical processor.

2. The image pickup device of claim 1 ,

wherein the mask area determination unit further includes a mask area renderer, which, in operation, renders the frequency distribution for each of the plurality of virtual lines generated by the line statistical processor in the image data.

3. The image pickup device of claim 2 ,

wherein the mask area renderer renders the mask area rendered according to the frequency distribution for each of the plurality of virtual lines according to the detection rate on the virtual line of the target designated by a predetermined change operation.

4. The image pickup device of claim 2 ,

wherein the mask area renderer renders a plurality of normal distribution curves indicating the frequency distribution for each of the plurality of virtual lines generated by the line statistical processor in the image data and displays the normal distribution curves on a display unit.

5. The image pickup device of claim 2 ,

wherein the mask area renderer renders the frequency distribution indicating the detection rate of the target detected by the target detector to be classified and identified using colors using the frequency distribution for each of the plurality of virtual lines generated by the line statistical processor and displays the frequency distribution on the display unit.

6. The image pickup device of claim 1 ,

wherein the line statistical processor increments a frequency indicating the detection rate of the target in an intersecting point position of a motion vector of a center of gravity of the area of a predetermined shape including the target of which the motion is detected by the target detector and the virtual line and generates the frequency distribution.

7. The image pickup device of claim 1 ,

wherein the line statistical processor increments a frequency indicating the detection rate of the target in an intersecting point position of the virtual line close to a center of gravity of an area of a predetermined shape including the target of which the motion is detected by the target detector and the predetermined shape and generates the frequency distribution.

8. The image pickup device of claim 1 ,

wherein the line statistical processor increments a frequency indicating the detection rate of the target in an intersecting point position of a motion vector of a center of gravity of an area of a predetermined shape including the target detected by the target detector and the virtual line and generates the frequency distribution.

9. The image pickup device of claim 1 ,

wherein the line statistical processor increments a frequency indicating the detection rate of the target in an intersecting point position of the virtual line close to a center of gravity of an area of a predetermined shape including the target detected by the target detector and the predetermined shape and generates the frequency distribution.

10. The image pickup device of claim 1 ,

wherein the line statistical processor displays the frequency distribution for each of the plurality of virtual lines generated using the result of the motion detection processing of the target in the target detector on the display unit.

11. The image pickup device of claim 1 ,

wherein the line statistical processor displays the frequency distribution for each of the plurality of virtual lines generated using the result of the detection processing of the target in the target detector on the display unit.

12. A characteristic part detection method comprising:

capturing a video image;

determining a mask area, for which processing for detection of a characteristic part of a target is excluded, among a portion or entirety of an area of image data of the captured video image;

detecting the target in the portion or entirety of the area of the image data of the captured video image;

generating a frequency distribution indicating a detection rate on a virtual line of the detected target for each of a plurality of virtual lines which are set for the entire area of image data;

extracting the mask area from the portion or entirety of the area of the image data based on the frequency distribution for each of the generated plurality of virtual lines;

performing processing for detection of the characteristic part of the target on a detection target area obtained by excluding the determined mask area from the portion or entirety of the area of the image data of the captured video image.