Method for detecting object traveling direction
View Patent ↗An object of the invention is to provide a target travel direction detecting method capable of detecting the travel direction of efficiently detecting the travel direction of a target by using a small amount of information. The target travel direction detecting method according to the invention generates a lightness image from each of the two color images picked up at predetermined time intervals and causes a template of n by n 105 to scan the lightness image at time t to detect a position where the target is present. Next, the values of pixels around the pixel of the position where the target is detected are stored into the template 105 . The template 105 storing the pixel values is used to scan the lightness image at time t+1 and detect a pixel that matches each pixel value of the template 105 . Then, the target is plotted for each travel direction at a pixel position matching the template 105 on the lightness image at time t+1 to create a travel-direction-extracted image.
1. A target travel direction detecting method comprising: an image acquiring step of acquiring an image including a target picked up at predetermined time intervals;
an extracted image creating step of creating an image including an arbitrary component extracted from the image;
a target position detecting step of causing a matrix template to scan the extracted image at time t to detect the position of the target;
a pixel value storing step of storing each pixel value of the extracted image at time t into the template;
a value-matching pixel detecting step of causing a template storing the pixel value to scan the extracted image at time t+1 to detect the position of a pixel whose value matches a pixel value of the template; and
a travel-direction-extracted image creating step of plotting a pixel value set to accordance with the travel direction of the target at the same coordinate position as the pixel position detected in the value-matching pixel detecting step to create a travel-direction-extracted image.
2. A target travel direction detecting method comprising: an image acquiring step of acquiring an image including a target picked up at predetermined time intervals;
an extracted image creating step of creating respective images including arbitrary components extracted from the image;
a target position detecting step of respectively causing a matrix template to scan each of the extracted images at time t to respectively detect the position of the target;
a pixel value storing step of storing each pixel value of each of the extracted images at time t into each of the templates;
a value-matching pixel detecting step of causing each template storing the pixel value to scan each of the extracted images at time t+1 to respectively detect the position of a pixel whose value matches each pixel value of each of the templates; and
a travel-direction-extracted image creating step of plotting a pixel value set to accordance with the travel direction of the target at the same coordinate position as each of the pixel positions detected in the value-matching pixel detecting step to respectively create a plurality of travel-direction-extracted images and obtain, per pixel, the mean value of the plurality of travel-direction-extracted images in order to create a complex travel-direction-extracted image.
3. The target travel direction detecting method according to claim 1 , wherein
the travel-direction-extracted image creating step includes a speed calculating step of obtaining a speed of the target based on the distance between the position of a first center of gravity as a center of gravity of the target in a first travel-direction-extracted image created based on an image picked up at time t and an image picked up at time t+1, and the position of a second center of gravity as a center of gravity of the target in a second travel-direction-extracted image created based on an image picked up at time t+1 and an image picked up at time t+2.
4. The target travel direction detecting method according to claim 1 , wherein
the extracted image creating step selects and extracts a lightness component, a hue component and a chroma component from a color image.
5. The target travel direction detecting method according to claim 1 , comprising
a space-time image creating step of creating a space-time image where images in a predetermined area extracted from each of the travel-direction-extracted images created in the travel-direction-extracted image creating step are arranged in chronological order.
6. The target travel direction detecting method according to claim 2 , wherein
the travel-direction-extracted image creating step includes a speed calculating step of obtaining a speed of the target based on the distance between the position of a first center of gravity as a center of gravity of the target in a first travel-direction-extracted image created based on an image picked up at time t and an image picked up at time t+1, and the position of a second center of gravity as a center of gravity of the target in a second travel-direction-extracted image created based on an image picked up at time t+1 and an image picked up at time t+2.
7. The target travel direction detecting method according to claim 2 , wherein
the extracted image creating step selects and extracts a lightness component, a hue component and a chroma component from a color image.
8. The target travel direction detecting method according to claim 3 , wherein
the extracted image creating step selects and extracts a lightness component, a hue component and a chroma component from a color image.
9. The target travel direction detecting method according to claim 2 , comprising
a space-time image creating step of creating a space-time image where images in a predetermined area extracted from each of the travel-direction-extracted images created in the travel-direction-extracted image creating step are arranged in chronological order.
10. The target travel direction detecting method according to claim 3 , comprising
a space-time image creating step of creating a space-time image where images in a predetermined area extracted from each of the travel-direction-extracted images created in the travel-direction-extracted image creating step are arranged in chronological order.
11. The target travel direction detecting method according to claim 4 comprising; a space-time image creating step of creating a space time image where images in a predetermined area extracted from each of the travel-direction-extracted images created in the travel-direction extracted image creating step are arranged in chronological order.