create custom filter to image

create custom filter using mean and covariance

Answer 1

[KALYAN ACHARJYA]

Use mean2 and conv2

Is this OK with exp^ terms?

-0.5 * x * brcov.^(-1) * x'

>> whos x
  Name         Size              Bytes  Class    Attributes
  x         1168x565            659920  uint8              
>> b1=brcov.^(-1);
>> whos b1
  Name         Size                 Bytes  Class     Attributes
  b1        1167x1129            10540344  double              
>> x';
>> x1=x';
>> whos x1
  Name        Size               Bytes  Class    Attributes
  x1        565x1168            659920  uint8              
>> b1=brcov.^(-1);