qtsetblk (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

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, int16, single, 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

I = [1    1    1    1    2    3    6    6
     1    1    2    1    4    5    6    8
     1    1    1    1   10   15    7    7
     1    1    1    1   20   25    7    7
    20   22   20   22    1    2    3    4
    20   22   22   20    5    6    7    8
    20   22   20   20    9   10   11   12
    22   22   20   20   13   14   15   16];

S = qtdecomp(I,5);

newvals = cat(3,zeros(4),ones(4)); 
J = qtsetblk(I,S,4,newvals)

See Also

qtdecomp, qtgetblk

qtgetblk radon