Block Processing

Repeat user-specified operation on blocks of input matrix

• 

Libraries:
Computer Vision Toolbox / Utilities

Description

The Block Processing block extracts submatrices, or blocks , from an input matrix, passes each block to a subsystem that performs a user-specified operation. It then reassembles the processed blocks to form the output matrix. You can use this block to process an image block-wise, rather than processing the entire image at once. Matrix block processing proceeds from input matrix to extracted blocks, then the subsystem, and then recombines the processed blocks into an output matrix.

Examples

Transpose Blocks of Image Using Block Processing

Transpose blocks of an image using block processing.

• Open Model

Resize RGB Image Using Block Processing

Resize an RGB image using block processing.

• Open Model

Ports

Input

I — Input signal

matrix

Input signal, specified as an M-by-N matrix. This port is unnamed unless you select the Add port to supply subsystem parameters parameter or set the Number of inputs parameter to 2 or more. If you select Add port to supply subsystem parameters parameter, the port name becomes I. If you set Number of inputs to a value greater than 1, n, then block has n input ports from I to In. The contents of the subsystem determines the data type of the input data.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point
Complex Number Support: Yes

P — Additional input to supply subsystem parameters

scalar | vector | matrix | array

Additional input to supply subsystem parameters, specified as a scalar, vector, matrix, or array. The contents of the subsystem determines the data type of the input data.

Dependencies

To enable this port, you must select the Add port to supply subsystem parameters parameter.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | string

Output

Port_1 — Output signal

matrix

Output data, returned as a matrix. The value of the Number of outputs determines the number of output ports. The contents of the subsystem determine the data type of the output data.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point
Complex Number Support: Yes

Parameters

Number of inputs — Number of inputs

1 (default) | positive scalar

Specify the number of input ports to the Block Processing block as a positive scalar.

Add port to supply subsystem parameters — Subsystem parameter input port

off (default) | on

Select this parameter to add an additional input port to the Block Processing block for supplying subsystem parameters.

Number of outputs — Number of outputs

1 (default) | positive scalar

Specify the number of output ports on the Block Processing block as a positive scalar.

Block size — Block size

{[8 8]} (default) | cell array

Specify the size of each block as a cell of two-element vectors. The cell array must contain either a single cell or one cell for each input port. If the block has one input port, enter only one vector. If the block has more than one input port, you can enter one vector to use for all inputs, or you can specify an individual vector for each input. The block uses the vectors in the order you enter them.

Overlap — Block overlap

{[0 0]} (default) | cell array

Specify the overlap of each block as cell of two-element vectors. The cell array must contain either a single cell or one cell for each input port. If the block has one input port, enter only one vector. If the block has more than one input port, you can enter one vector to use for all inputs, or you can specify an individual vector for each input. The block uses the vectors in the order you enter them.

Traverse order — Order of block extraction

Row-wise (default) | Column-wise

Specify the traverse order with which the Block Processing block extracts submatrices from the input matrix. If you select Row-wise, the block extracts submatrices by moving across the rows. If you select Column-wise, the block extracts submatrices by moving down the columns

Subsystem

To configure the subsystem of the Block Processing block.

• Click Open Subsystem to open the Block Processing subsystem.

• Drag blocks into this subsystem to define the processing operations the block performs on the submatrices.

Block Characteristics

Data Types	Booleana | doublea | fixed pointa | integera | singlea
Multidimensional Signals	no
Variable-Size Signals	yes
a The blocks inside the subsystem dictate the data types supported by this block.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced before R2006a