OpenLvVision_OpenCv.lvlib:PyrDown.vim

Blurs an image and downsamples it.

By default, size of the output image is computed as Size((src.cols+1)/2, (src.rows+1)/2), but in any case, the following conditions should be satisfied:

$ \begin{aligned} | \texttt{dstsize.width} \cdot 2 - \texttt{src.cols} | &\leq 2 \\ | \texttt{dstsize.height} \cdot 2 - \texttt{src.rows} | &\leq 2 \end{aligned} $

The function performs the downsampling step of the Gaussian pyramid construction. First, it convolves the source image with the kernel:

$ \frac{1}{256} \begin{bmatrix} 1 & 4 & 6 & 4 & 1 \\ 4 & 16 & 24 & 16 & 4 \\ 6 & 24 & 36 & 24 & 6 \\ 4 & 16 & 24 & 16 & 4 \\ 1 & 4 & 6 & 4 & 1 \end{bmatrix} $

Then, it downsamples the image by rejecting even rows and columns.

For detailed information, please refer to the OpenCV documentation

OpenLvVision_OpenCv.lvlib:PyrDown.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; it has the specified size and the same type as src.

ci32

BorderTypes

Pixel extrapolation method, see BorderTypes (BORDER_CONSTANT isn't supported)

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.

cnclst

dstSize

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 out

output image; it has the specified size and the same type as src.