OpenLvVision_OpenCv.lvlib:WarpPerspective.vim

Applies a perspective transformation to an image.

The function warpPerspective transforms the source image using the specified matrix:

$ \texttt{dst}(x,y) = \texttt{src}\!\left( \frac{M_{11}x + M_{12}y + M_{13}}{M_{31}x + M_{32}y + M_{33}},\; \frac{M_{21}x + M_{22}y + M_{23}}{M_{31}x + M_{32}y + M_{33}} \right) $

This formula is used when the flag WARP_INVERSE_MAP is set. Otherwise, the transformation matrix is first inverted using invert and then applied.

The function cannot operate in-place.

For detailed information, please refer to the OpenCV documentation

OpenLvVision_OpenCv.lvlib:WarpPerspective.vim

cerrcodeclst

error in

error in can accept error information wired from VIs previously called. Use this information to decide if any functionality should be bypassed in the event of errors from other VIs.

Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

    cbool

    		status

    status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

    Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

    ci32

    		code

    cstr

    		source

    source describes the origin of the error or warning.

    Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

cOpenLvVision__OpenCv_lvlib_Anythinglvclass

Src

input image.

cOpenLvVision__OpenCv_lvlib_Anythinglvclass

Dst

output image that has the size dsize and the same type as src .

cOpenLvVision__OpenCv_lvlib_Anythinglvclass

M

3x3 transformation matrix.

ci32

BorderTypes

pixel extrapolation method (see BorderTypes); when borderMode=BORDER_TRANSPARENT, it means that the pixels in the destination image corresponding to the "outliers" in the source image are not modified by the function.

BORDER_CONSTANT = 0, !< `iiiiii|abcdefgh|iiiiiii` with some specified `i`

BORDER_REPLICATE = 1, `aaaaaa|abcdefgh|hhhhhhh`

BORDER_REFLECT = 2, `fedcba|abcdefgh|hgfedcb`

BORDER_WRAP = 3, `cdefgh|abcdefgh|abcdefg`

BORDER_REFLECT_101 = 4, `gfedcb|abcdefgh|gfedcba`

BORDER_TRANSPARENT = 5, `uvwxyz|abcdefgh|ijklmno` - Treats outliers as transparent.

BORDER_ISOLATED = 16 Interpolation restricted within the ROI boundaries.

c1ddbl

BorderValue

value used in case of a constant border; by default, it is 0.

    cdbl

    		Numeric

ci32

InterpolationFlags

combination of interpolation methods (see InterpolationFlags) and the optional flag WARP_INVERSE_MAP that means that M is the inverse transformation

INTER_NEAREST: nearest neighbor interpolation

INTER_LINEAR: bilinear interpolation

INTER_CUBIC: bicubic interpolation

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.

INTER_LANCZOS4: Lanczos interpolation over 8x8 neighborhood

INTER_LINEAR_EXACT: Bit exact bilinear interpolation

INTER_NEAREST_EXACT: Bit exact nearest neighbor interpolation. This will produce same results as the nearest neighbor method in PIL, scikit-image or Matlab.

INTER_MAX: mask for interpolation codes

WARP_FILL_OUTLIERS: flag, fills all of the destination image pixels. If some of them correspond to outliers in the source image, they are set to zero

WARP_INVERSE_MAP: flag, inverse transformation

WARP_RELATIVE_MAP

cnclst

dsize

size of the output image.

    ci32

    		X

    ci32

    		Y

ierrcodeclst

error out

error in can accept error information wired from VIs previously called. Use this information to decide if any functionality should be bypassed in the event of errors from other VIs.

Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

    ibool

    		status

    status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

    Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

    ii32

    		code

    istr

    		source

    source describes the origin of the error or warning.

    Right-click the error in control on the front panel and select Explain Error or Explain Warning from the shortcut menu for more information about the error.

iOpenLvVision__OpenCv_lvlib_Anythinglvclass

Dst

output image that has the size dsize and the same type as src .