Moving body detection device of camera

• US 5,627,586 A
• Filed: 04/08/1993
• Issued: 05/06/1997
• Est. Priority Date: 04/09/1992
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Yamasaki, Masafumi
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): CHRISTENSEN, ANDREW BRUCE
• Application Number:
  US08/045,039
• Time in Patent Office: 1,489 Days
• Field of Search: 348/345, 348/208, 348/699, 348/700, 348/413, 348/414, 348/416, 348/333, 348/222, 348/169, 348/170, 348/352, 348/349, 348/353, 354/400, 354/430, 382/103, 382/107, 382/236, 250/203.1, 342/76
• US Class Current: 348/169
• CPC Class Codes: F41G 7/2226 comparing the observed data with stored target data, e.g. target configuration data
• CPC Class Codes: F41G 7/2253 Passive homing systems, i.e. comprising a receiver and do not requiring an active illumination of the target
• CPC Class Codes: F41G 7/2293 using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 11/12 using electromagnetic waves other than radio waves
• CPC Class Codes: G03B 2217/005 Blur detection
• CPC Class Codes: G06T 7/20 Analysis of motion motion estimation for coding, decoding, compressing or decompressing digital video signals H04N19/43, H04N19/51
• CPC Class Codes: H04N 23/61 based on recognised objects
• CPC Class Codes: H04N 23/635 Region indicators; Field of view indicators
• CPC Class Codes: H04N 5/145 Movement estimation for video coding H04N19/51

Abstract

In a moving body detection device of a camera in this invention, in order to correctly detect an area in which a target moving body is present even when the camera moves, an area in which the moving body is present is detected from a plurality of divided areas by comparing respective motion vectors. Further, in the moving body detection device of a camera in this invention, an image of an object derived by use of a video camera is detected by a CPU via a Y/C separation circuit, A/D converter circuit and video RAMs. Motion vectors of image portions are detected from the two image portions which are extracted at two different timings from desired first and second preset areas of the detected image displayed on a display unit by means of the CPU, video RAMs, RAM and ROM. Then, whether an object which is present in the first preset area is a moving body or not is determined by the CPU based on the detected motion vector of the image.

Claims

1. A moving object-detection device of a camera, comprising:

video signal output means for outputting a video signal representing an object to be photographed;

input means for inputting a position of a gazing point;

first storing means for storing a first video signal representing images which are included in a moving object detection zone and four corners of an image plane at a first timing, as basis signals, and second storing means for storing a second video signal representing images which are included in the moving object detection zone and the four corners of the image plane at a second timing after a predetermined time period from the first timing, as reference signals, the moving object detection zone being a part of an image represented by the video signal and the four corners being parts of the image represented by the video signal, and wherein the moving object detection zone has the gazing point and a periphery region which extends from the gazing point and comprises a plurality of divided zones such that the divided zones partially overlap each other;

contrast determination means for determining contrast of each of the images of the moving object detection zone and the four corners on the basis of the first video signals;

third storing means for storing a determination result indicating that the contrast of the divided zones of the moving object detection zone and the four images of the four corners is low, in association with a number assigned to the divided zone and the four images, respectively;

correlation calculation means for performing a correlation calculation with respect to said each of the images of the divided zones and the four corners which are represented by the first video signal and said each of the images of the divided zones and the four corners which are represented by the second video signal, in each of horizontal and vertical directions, thereby to obtain a correlation value, in association with a number assigned to an associated one of the divided zones and the four corners, respectively;

reliability determination means for determining reliability of the correlation value;

fourth storing means for storing a determination result indicating that the reliability of the correlation value of each of the images of the divided zones and the four corners is low, in association with a number assigned to an associated one of the divided zone and the four corners, respectively;

classifying means for classifying the images, which are other than the images determined to have low contrast or low reliability of the correlation value, thereby to determine whether or not the correlation value of said each of the images to be classified, in said each of the horizontal and vertical directions, falls within a predetermined range;

determination means for determining that the image included in the moving object detection zone is static when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is one, the image included in the moving object detection zone has moved in a direction differing from a direction where the four images have moved, when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is two, and the image included in the moving object detection zone is unable to be tracked when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is three or more.

2. A moving object-detection device according to claim 1, wherein said first storing means stores the reference signals after updating the reference signals, when said determination means determines that the image included in the moving object detection zone is static.

3. A moving object-detection device according to claim 2, further comprising counting means for counting the number of times that the reference signals are updated, and determining one of the images which is determined to have a maximum contrast, as a track region, when said number of times reaches a predetermined value.

4. A moving object-detection device according to claim 1, further comprising display means for displaying the image included in the moving object detection zone when said determination means determines that the image included in the moving object detection zone has moved.

5. A moving object-detection device of a camera, comprising:

video signal output means for outputting a video signal representing an object to be photographed;

input means for inputting a position of a gazing point;

storing means for storing a first video signal representing images which are included in a moving object detection zone and peripheral areas defined in advance in an image plane, as basic signals, at a first time, and for storing a second video signal representing images included in the moving object detection zone and the peripheral areas of the image plane at a second time after a predetermined time period from the first time, as reference signals, the moving object detection zone and the peripheral areas being parts of an image represented by the first video signal, and wherein the moving object detection zone has the gazing point and a periphery region which extends from the gazing point and comprises a plurality of divided zones such that the divided zones partially overlap each other;

motion vector calculation means for performing a correlation calculation with respect to said each of the images represented by the first video signal and said each of the images represented by the second video signal, in two directions of the image plane, thereby to obtain a motion vector of said each of the images represented by the first video signal and said each of the images represented by the second video signal, in association with a number assigned to an associated one of the divided zone and the specific peripheral areas, respectively;

classifying means for classifying the motion vector of said each of the images of the divided zone and the peripheral areas, thereby to determine if each of the motion vectors of said each of the images represented by the first video signal and said each of the images represented by the second video signal falls within a predetermined range;

determination means for determining that the image included in the moving object detection zone is static when a number of the images, each of which has the correlation value determined to fall within the predetermined range, is one, the image included in the moving object detection zone has moved in a direction differing from a direction where the peripheral images have moved, when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is two, and the image included in the moving object detection zone is unable to be tracked, when the number of the images, each of which has the correlation value determined to fall within the predetermined range, is three or more.