- src – input image.
- dst – output image; it has the size dsize (when it is non-zero) or the size computed from src.size(), fx, and fy; the type of dst is the same as of src.
- dsize –output image size; if it equals zero, it is computed as:
dsize = Size(round(fx × src.cols), round(fy × src.rows)) - fx –scale factor along the horizontal axis; when it equals 0, it is computed as
- fy –scale factor along the vertical axis; when it equals 0, it is computed as
- interpolation –interpolation method:
-
INTER_NEAREST a nearest-neighbor interpolation 最近邻插值 INTER_LINEAR a bilinear interpolation (used by default) 双线性插值（默认设置） INTER_AREA resampling using pixel area relation. It may be a preferred method for image decimation, as it gives moire’-free results. But when the image is zoomed, it is similar to the INTER_NEAREST method.使用像素区域关系进行重采样。 它可能是图像抽取的首选方法，因为它会产生无云纹理的结果。 但是当图像缩放时，它类似于INTER_NEAREST方法。 INTER_CUBIC a bicubic interpolation over 4x4 pixel neighborhood 4x4像素邻域的双三次插值 INTER_LANCZOS4 a Lanczos interpolation over 8x8 pixel neighborhood 8x8像素邻域的Lanczos插值
resize(...)
resize(src, dsize[, dst[, fx[, fy[, interpolation]]]]) -> dst
. @brief Resizes an image.
.
. The function resize resizes the image src down to or up to the specified size. Note that the
. initial dst type or size are not taken into account. Instead, the size and type are derived from
. the `src`,`dsize`,`fx`, and `fy`. If you want to resize src so that it fits the pre-created dst,
. you may call the function as follows:
. @code
. // explicitly specify dsize=dst.size(); fx and fy will be computed from that.
. resize(src, dst, dst.size(), 0, 0, interpolation);
. @endcode
. If you want to decimate the image by factor of 2 in each direction, you can call the function this
. way:
. @code
. // specify fx and fy and let the function compute the destination image size.
. resize(src, dst, Size(), 0.5, 0.5, interpolation);
. @endcode
. 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).
.
. @param src input image.
. @param dst output image; it has the size dsize (when it is non-zero) or the size computed from
. src.size(), fx, and fy; the type of dst is the same as of src.
. @param dsize output image size; if it equals zero, it is computed as:
. \f[\texttt{dsize = Size(round(fx*src.cols), round(fy*src.rows))}\f]
. Either dsize or both fx and fy must be non-zero.
. @param fx scale factor along the horizontal axis; when it equals 0, it is computed as
. \f[\texttt{(double)dsize.width/src.cols}\f]
. @param fy scale factor along the vertical axis; when it equals 0, it is computed as
. \f[\texttt{(double)dsize.height/src.rows}\f]
. @param interpolation interpolation method, see cv::InterpolationFlags
.
. @sa warpAffine, warpPerspective, remap
