Image analysis – Pattern recognition – Template matching
Patent
1995-04-20
1998-05-19
Boudreau, Leo
Image analysis
Pattern recognition
Template matching
382227, G06K 968
Patent
active
057546924
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a picture coincidence detecting apparatus and a picture coincidence detecting method, which detect and evaluate, in pixel or block units, coincidence between two imaged pictures, and more particularly to a picture coincidence detecting apparatus and a picture coincidence detecting method suitable when used in allowing a lower resolution picture and a higher resolution picture imaged (image-picked up) by image pick-up devices having different resolutions.
BACKGROUND ART
In general, in digital signal processing for picture, there is a method in which pictures imaged by the same camera system are used to allow one image pick-up picture and the other image pick-up picture to be in correspondence with each other. This method is block matching method known in detection of movement (motion) quantity.
In accordance with this block matching method, a block of a predetermined size is first set on one image pick-up picture. Moreover, a search range for making search for the set block is set on the other image pick-up picture. Evaluation of picture coincidence is carried out in dependency upon whether or not the block and search block within the search range have similarity therebetween. The block matching method carries out a series of processing as described above over the entire picture to detect whether or not one image pick-up picture and the other image pick-up picture are in correspondence with each other.
In this case, since image pick-up pictures used are pictures imaged by the same camera system as described above, respective pictures are in correspondence with each other in picture angle format, i.e., aspect ratio and respective pixels within pictures respectively have one-to-one correspondence relationship to each other. For this reason, there occurs no difference in signal characteristics of respective pictures, particularly luminance signals. As a result, in the block matching method, coincidence detection with respect to desired respective pictures is easily carried out.
Meanwhile, in imaging the same object by different camera systems in place of image pick-up at the same camera system, it is impossible to conduct, with ease, coincidence detection between one picture and the other picture as described above. The cause thereof is as follows. Namely, impossibility or difficulty of coincidence detection takes place because picture angle (angle of view) formats of different camera systems are not in correspondence with each other, i.e., with respect to pixel position of block of one picture, picture position within the search range of the other picture is not in correspondence therewith.
In addition, since camera systems different from each other have specifications different from each other, e.g., optical filters of cameras used would be different, and/or any difference would take place also in the noise characteristics of imaged pictures. By imaging operation with such camera systems of different specifications, difference between respective output signal characteristics becomes conspicuous. Particularly, between pictures imaged by camera systems having different resolutions, differences qualitatively take place in level distribution of luminance signals and dynamic range between signals. For this reason, even if attempt is made to detect coincidence between pictures imaged in different formats, because positions of pixels constituting picture are not in correspondence with each other and characteristics of respective output pictures are not in correspondence with each other, detection of pictures completely coincident with each other was unable to be carried out.
An object of this invention is to provide a picture coincidence detecting apparatus and a picture coincidence method which can detect coincidence between pictures or pixels even with respect to pictures such that both pixel positions differ from each other, e.g., in dependency upon pictures having different picture angles (angle of view).
DISCLOSURE OF THE INVENTION
A picture coincidence detectin
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Horishi Takashi
Kondo Tetsujiro
Boudreau Leo
Frommer William S.
Kelley Christopher
Sony Corporation
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