qtsetblk (Image Processing Toolbox)

Set block values in quadtree decomposition

Syntax

```
J = qtsetblk(I,S,dim,vals)
```

Description

J = qtsetblk(I,S,dim,vals) replaces each dim-by-dim block in the quadtree decomposition of I with the corresponding dim-by-dim block in vals. S is the sparse matrix returned by qtdecomp; it contains the quadtree structure. vals is a dim-by-dim-by-k array, where k is the number of dim-by-dim blocks in the quadtree decomposition.

Class Support

I can be of class logical, uint8, uint16, or double. S is of class sparse.

Remarks

The ordering of the blocks in vals must match the columnwise order of the blocks in I. For example, if vals is 4-by-4-by-2, vals(:,:,1) contains the values used to replace the first 4-by-4 block in I, and vals(:,:,2) contains the values for the second 4-by-4 block.

Example

This example continues the qtgetblock example.

newvals = cat(3,zeros(4),ones(4)); 
J = qtsetblk(I,S,4,newvals)
 
J =
 
     0     0     0     0     2     3     6     6
     0     0     0     0     4     5     6     8
     0     0     0     0    10    15     7     7
     0     0     0     0    20    25     7     7
     1     1     1     1     1     2     3     4
     1     1     1     1     5     6     7     8
     1     1     1     1     9    10    11    12
     1     1     1     1    13    14    15    16

See Also

qtdecomp, qtgetblk

qtgetblk radon