... smoothing:LPI⊗=P01014–1010PII55,()10=I55,()LL 55,()L 45,()L 65,()L 54,()L 56,() 3 3×Perception 133 (4 .33 ) (4 .34 )The same process can be used to identify values for and , yielding complete infor-mation about ... withintensities is defined as (4 .35 )r21xlf r22ylf r 23 ++z'lr02+yrf z'r=r 31 xlf r 32 ylf r 33 ++z'lr 03 + z'r=x' y'PPLxy,()Ixy,()Lxy,()x22∂∂ ... equation (4 .35 ) is requiredfor application: (4 .36 )We depict a discrete operator , called a kernel, that approximates the second derivativeoperation along both axes as a 3 x 3 table: (4 .37 )Application...