Imaging apparatus and subject tracking method

A technology for a camera device and an object area, which is applied in the field of camera device and object tracking, can solve the problems of increased computational complexity, inability to track objects, and inability to match object blocks, and achieve good detection results.

Active Publication Date: 2010-10-20
CASIO COMPUTER CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, according to the technique described in Patent Document 1, since block matching is performed on the same search condition regardless of the motion of the object to be photographed, for example, when the motion of the object to be photographed changes drastically in the frame image, it cannot Issues with performing block matching for subjects with dramatic changes in motion
[0004] Specifically, in the case of

Method used

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  • Imaging apparatus and subject tracking method

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Example Embodiment

[0017] With reference to the drawings, an imaging device according to an embodiment of the present invention will be described. FIG. 1(A) is a front view showing the external appearance of the imaging device 1 according to this embodiment, and FIG. 1(B) is a back view. In this imaging device 1, an imaging lens 2 is provided on the front surface, and a shutter button 3 is provided on the top surface. The shutter button 3 includes a so-called half-shutter function capable of performing half-pressing operations and full-pressing operations. In addition, function keys 4, cursor keys 5, and display unit 6 are provided on the back. The cursor key 5 functions as a dial switch that can be rotated in the direction of a in FIG. 1(B). The display unit 6 is composed of, for example, an LCD (Liquid Crystal Display) having an aspect ratio of 16:9.

[0018] figure 2 It is a block diagram showing the basic structure of the imaging device 1. The imaging device 1 consists of an imaging lens 2,...

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Abstract

The invention provides an imaging apparatus and a subject tracking method. If there is no movement of the imaging apparatus and no subject presence estimation region, normal tracking setting is accomplished (step S203), while if there is a subject presence estimation region, tracking setting is accomplished by expanding the detection range and lowering the detection threshold value (step S204). If the imaging apparatus is moving and there is no subject presence estimation region, normal tracking settings are accomplished (step S208), while if there is a subject presence estimation region, a determination is made as to whether or not that region is one with no flow (movement vector) detected. If this is a region with no flow detected, tracking settings are accomplished by expanding the detection range and using normal detection threshold values (step S207). If there is a region with flow detected, tracking settings are made by expanding the detection range and lowering the detection threshold value (step S204).

Description

technical field [0001] The invention relates to a camera and a method for tracking an object to be photographed. Background technique [0002] An imaging device having a function of sequentially detecting the position of a moving subject is known. For example, there is a technique of tracking a subject using template matching (also called block matching). For example, the image monitoring device described in Patent Document 1 (JP Laid-Open No. 2001-076156) retrieves and extracts from the previous frame image (image including the subject to be tracked) from the search range of the current frame image. The small image regions that are similar to the templates are detected, and the small image regions with the highest similarity are detected. In addition, it is determined that the subject is moving within the detected small image area. Also, if the frame image is captured again, by updating the detected small image area as a template and repeating the above operation, it is ...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCG06T7/20
Inventor 松本康佑
Owner CASIO COMPUTER CO LTD
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