Image matching method using direction sensitivity and vector smo

Details Image matching method using direction sensitivity and vector smo Image matching method using direction sensitivity and vector smo

1993-04-06

1995-04-11

Couso, Yon J.

Image analysis

Histogram processing

For setting a threshold

382 42, 382 44, 348154, G06K 968

Patent

active

054066425

ABSTRACT:
In a block matching method, a successive one of segmented blocks of a first image is superimposed on a portion of a second image, and a correlation is detected therebetween. The superimposed block is successively moved by a small amount and correlations are repeatedly detected for different locations of the successively moved block. A maximum value of the correlations is detected and a vector representing the location of the block of the maximum correlation is stored into a memory as a match between a block of the first image and a portion of the second image. The process is repeated for the remaining blocks of the first image to create a map of the matching vectors in the memory. Direction sensitivity functions and vector smoothing functions are derived from the segmented blocks for respectively correcting the stored matching vectors. In a preferred embodiment, prior to the successive movement of the block, a first direction sensitivity function is derived from the block and a second direction sensitivity function from the corresponding portion of the second image. Correlation is detected between these functions and the block is successively rotated by a small angle, and the derivation of these functions and the detection of correlations therebetween are repeated to detect a maximum correlation. The orientation of the block is set to the angle of the the maximum correlation. A gradient method is employed for deriving optimum values for correcting the stored vectors.

REFERENCES:
patent: 4677476 (1987-06-01), Kondo
patent: 4736437 (1988-04-01), Sacks et al.
patent: 4805224 (1989-02-01), Koezuka et al.
"The Motion Coherence Theory"; Alan L. Yuille and Norberto M. Grzyacz; IEEE; pp. 344-353; 1988.

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