Brightness-constancy in unrecognized shadows.

1940 ◽  
Vol 27 (1) ◽  
pp. 1-22 ◽  
Author(s):  
R. B. MacLeod
Keyword(s):  
Brightness Constancy

scholarly journals Motion Vector Field Estimation Using Brightness Constancy Assumption and Epipolar Geometry Constraint

2014 ◽  
Vol II-1 ◽  
pp. 9-16 ◽  
Author(s):  
S. Hosseinyalamdary ◽  
A. Yilmaz
Keyword(s):  
Vector Field ◽  
Optical Flow ◽  
Motion Vector ◽  
Epipolar Geometry ◽  
Estimation Methods ◽  
Brightness Constancy ◽  
Flow Estimation ◽  
Optical Flow Estimation ◽  
Motion Vector Field ◽  
Field Estimation

In most Photogrammetry and computer vision tasks, finding the corresponding points among images is required. Among many, the Lucas-Kanade optical flow estimation has been employed for tracking interest points as well as motion vector field estimation. This paper uses the IMU measurements to reconstruct the epipolar geometry and it integrates the epipolar geometry constraint with the brightness constancy assumption in the Lucas-Kanade method. The proposed method has been tested using the KITTI dataset. The results show the improvement in motion vector field estimation in comparison to the Lucas-Kanade optical flow estimation. The same approach has been used in the KLT tracker and it has been shown that using epipolar geometry constraint can improve the KLT tracker. It is recommended that the epipolar geometry constraint is used in advanced variational optical flow estimation methods.

Relationship of Induced Muscle Tension to Phenomenon of Brightness Constancy

1970 ◽  
Vol 30 (3) ◽  
pp. 945-946
Author(s):  
Richard E. Cantey ◽  
Joseph G. Phelan
Keyword(s):  
Los Angeles ◽  
Repeated Measures ◽  
Muscle Tension ◽  
Female College Students ◽  
California State College ◽  
Brightness Constancy ◽  
Repeated Measures Design ◽  
State College ◽  
Muscular Tension ◽  
Relationship Of

11 male and 11 female college students at California State College, Los Angeles were tested for brightness constancy perception while experiencing induced muscular tension (IMT). One-half S's maximum grip on a standard hand dynomometer was used for induced muscular tension. IMT was expected to increase activation and attention, and facilitate veridicality of perception in the brightness constancy situation. A repeated measures design was used; each S ran through the constancy test twice, once with IMT, once without. A difference score was calculated for each S by substracting the scores obtained with IMT from those obtained without. The t test ( p < .05; t = 2.23) was in the opposite direction from the predicted. IMT heightened activation, but the outcome was facilitation of brightness constancy, not veridicality.

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