hexagon.hvx.dilate7x7

R2026b

2-D grayscale dilation with a 7-by-7 square structuring element for HVX

Since R2026a

Syntax

dilateOut = hexagon.hvx.dilate7x7(Input)

Description

dilateOut = hexagon.hvx.dilate7x7(Input) performs 2-D grayscale dilation of the input matrix Input with a 7-by-7 square structuring element for Hexagon^® Vector eXtension (HVX).

Examples

Compare Image Dilation Using 3x3, 5x5, and 7x7 Kernels

Create a grayscale image with two bright squares.

%% Create a simple binary-style image (uint8)
H = 100; W = 128;              
img = zeros(H, W, 'uint8');
% Draw two white squares
img(30:35, 30:35) = 255;        % Square 1
img(60:65, 80:85) = 255;        % Square 2

To apply dilation to the grayscale image with different kernel sizes, use the hexagon.hvx.dilate3x3, hexagon.hvx.dilate5x5, and hexagon.hvx.dilate3x3 functions.

%% Apply dilation with different kernel sizes
out3 = hexagon.hvx.dilate3x3(img);   % 3x3 kernel
out5 = hexagon.hvx.dilate5x5(img);   % 5x5 kernel
out7 = hexagon.hvx.dilate7x7(img);   % 7x7 kernel

Visualize the original and dilated images.

tiledlayout(2,2,'TileSpacing','compact','Padding','compact');
nexttile
imshow(img, []);  
title('Original Image');
nexttile
imshow(out3, []); 
title('Dilated Image Using 3×3 Kernel');
nexttile
imshow(out5, []); 
title('Dilated Image Using 5×5 Kernel');
nexttile
imshow(out7, []); 
title('Dilated Image Using 7x7 Kernel')

Input Arguments

Input — 2-D input

matrix

2-D input, specified as a matrix whose width is a multiple of 128. The height of the matrix must be greater than or equal to 7.

Data Types: uint8

Output Arguments

dilateOut — Dilation result

matrix

Dilation result of 2-D grayscale dilation on the input matrix.

Version History

Introduced in R2026a

R2026b: QHVXIPCV.dilate7x7 function is renamed to hexagon.hvx.dilate7x7

The QHVXIPCV.dilate7x7 has been renamed to hexagon.hvx.dilate7x7.

If your code uses functions from the QHVXIPCV package, update your code to use the corresponding hexagon.hvx function instead.