#Resize

The Resize operator is used to resize the picture by interpolating the algorithm and scaling the picture to the target size according to the user's needs.

#Operator Effect

Input Image	Parameter	Output Image
	xscale=1.5 yscale=1.5

#Principle

The operator is formulated as follows, with different implementation details depending on the interpolation algorithm:

$\begin{aligned}\begin{cases}dst_{width}=xscale*src_{width}\\dst_{height}=yscale*src_{height}\end{cases}\end{aligned}$

For the bilinear interpolation method, the pixel mapping principle is as follows:

$dst(x,y)=Q*(1-b)+R*b$

$Q=src(m,n)*(1-a)+src(m,n+1)*a$

$R=src(m+1,n)*(1-a)+src(m+1,n+1)*a$

Among them, $src$ is the input image, $dst$ is the output image, and $m,n,x,y$ are the pixel point coordinates.

For the nearest neighbor interpolation method, the pixel mapping principle is as follows:

$\begin{aligned}\begin{cases}src_x=xscale*dst_x\\src_y=yscale*dst_y\end{cases}\end{aligned}$

Among them, $x,y$ are the coordinates of the picture.

#API Interface

For detailed interface information, please refer to hbVPResize.

#Usage