Function opencv::gapi::resize

source · 
pub fn resize(
    src: &GMat,
    dsize: Size,
    fx: f64,
    fy: f64,
    interpolation: i32
) -> Result<GMat>
Expand description

Resizes an image.

The function resizes the image src down to or up to the specified size.

Output image size will have the size dsize (when dsize is non-zero) or the size computed from src.size(), fx, and fy; the depth of output is the same as of src.

If you want to resize src so that it fits the pre-created dst, you may call the function as follows:

 explicitly specify dsize=dst.size(); fx and fy will be computed from that.
   resize(src, dst, dst.size(), 0, 0, interpolation);

If you want to decimate the image by factor of 2 in each direction, you can call the function this way:

 specify fx and fy and let the function compute the destination image size.
   resize(src, dst, Size(), 0.5, 0.5, interpolation);

To shrink an image, it will generally look best with cv::INTER_AREA interpolation, whereas to enlarge an image, it will generally look best with cv::INTER_CUBIC (slow) or cv::INTER_LINEAR (faster but still looks OK).

Note: Function textual ID is “org.opencv.imgproc.transform.resize”

Parameters

  • src: input image.
  • dsize: output image size; if it equals zero, it is computed as: block formula Either dsize or both fx and fy must be non-zero.
  • fx: scale factor along the horizontal axis; when it equals 0, it is computed as block formula
  • fy: scale factor along the vertical axis; when it equals 0, it is computed as block formula
  • interpolation: interpolation method, see cv::InterpolationFlags

See also

warpAffine, warpPerspective, remap, resizeP

C++ default parameters

  • fx: 0
  • fy: 0
  • interpolation: INTER_LINEAR