Name
zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor — Zoom an image by a given factor.
zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor scales the image ImageImageImageImageImageimage by a
factor of ScaleWidthScaleWidthScaleWidthScaleWidthScaleWidthscaleWidth in width and a factor
ScaleHeightScaleHeightScaleHeightScaleHeightScaleHeightscaleHeight in height. The parameter
InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation determines the type of interpolation used
(see affine_trans_imageaffine_trans_imageAffineTransImageaffine_trans_imageAffineTransImageAffineTransImage).
The domain of the input image is ignored, i.e., assumed to be
the full rectangle of the image.
If the system parameter 'int_zooming'"int_zooming""int_zooming""int_zooming""int_zooming""int_zooming" is set to
'true'"true""true""true""true""true", the internally used integer arithmetic may lead to
errors in the following two cases: First, if
zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor is used on an uint2 or int2 image with
high dynamics (i.e. images containing values close to the respective
limits) in combination with scale factors smaller than 0.5, then
the gray values of the output image may be erroneous. Second, if
InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation is set to a value other than
'nearest_neighbor'"nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor", a large scale factor is applied, and a
large output image is obtained, then undefined gray values at the
lower and at the right image border may result. The maximum width
B_max of this border of undefined gray values can be
estimated as B_max = 0.5 * S * I / 2^15, where S is the scale factor in one dimension
and I is the size of the output image in the corresponding
dimension. In both cases, it is recommended to set
'int_zooming'"int_zooming""int_zooming""int_zooming""int_zooming""int_zooming" to 'false'"false""false""false""false""false" via the operator
set_systemset_systemSetSystemset_systemSetSystemSetSystem.
zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor is not parallelized internally if
ScaleWidthScaleWidthScaleWidthScaleWidthScaleWidthscaleWidth = 0.5 and ScaleHeightScaleHeightScaleHeightScaleHeightScaleHeightscaleHeight =
0.5. Further zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor is not parallelized
internally with InterpolationInterpolationInterpolationInterpolationInterpolationinterpolation='nearest_neighbor'"nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor".
zoom_image_factorzoom_image_factorZoomImageFactorzoom_image_factorZoomImageFactorZoomImageFactor can be executed on OpenCL devices if the input
image does not exceed the maximum size of image objects of the selected
device. Due to numerical reasons, there can be slight differences in
the output compared to the execution on the CPU.
- Supports OpenCL compute devices.
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Automatically parallelized on tuple level.
- Automatically parallelized on channel level.
- Automatically parallelized on internal data level.
Scale factor for the width of the image.
Default value: 0.5
Suggested values: 0.25, 0.5, 1.5, 2.0
Typical range of values: 0.001
≤
ScaleWidth
ScaleWidth
ScaleWidth
ScaleWidth
ScaleWidth
scaleWidth
≤
10.0
Minimum increment: 0.001
Recommended increment: 0.1
Scale factor for the height of the image.
Default value: 0.5
Suggested values: 0.25, 0.5, 1.5, 2.0
Typical range of values: 0.001
≤
ScaleHeight
ScaleHeight
ScaleHeight
ScaleHeight
ScaleHeight
scaleHeight
≤
10.0
Minimum increment: 0.001
Recommended increment: 0.1
Type of interpolation.
Default value:
'constant'
"constant"
"constant"
"constant"
"constant"
"constant"
List of values: 'bilinear'"bilinear""bilinear""bilinear""bilinear""bilinear", 'constant'"constant""constant""constant""constant""constant", 'nearest_neighbor'"nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor""nearest_neighbor", 'weighted'"weighted""weighted""weighted""weighted""weighted"
read_image(Image,'monkey')
dev_display (Image)
zoom_image_factor (Image, ZoomImage, 0.25, 0.25, 'constant')
dev_display (ZoomImage)
read_image(&Image,"monkey");
disp_image(Image,WindowHandle);
zoom_image_factor(Image,&ZooImage,0.25,0.25,"constant");
disp_image(ZooImage,WindowHandle);
read_image(Image,'monkey')
dev_display (Image)
zoom_image_factor (Image, ZoomImage, 0.25, 0.25, 'constant')
dev_display (ZoomImage)
read_image(Image,'monkey')
dev_display (Image)
zoom_image_factor (Image, ZoomImage, 0.25, 0.25, 'constant')
dev_display (ZoomImage)
read_image(Image,'monkey')
dev_display (Image)
zoom_image_factor (Image, ZoomImage, 0.25, 0.25, 'constant')
dev_display (ZoomImage)
read_image(Image,'monkey')
dev_display (Image)
zoom_image_factor (Image, ZoomImage, 0.25, 0.25, 'constant')
dev_display (ZoomImage)
zoom_image_sizezoom_image_sizeZoomImageSizezoom_image_sizeZoomImageSizeZoomImageSize,
affine_trans_imageaffine_trans_imageAffineTransImageaffine_trans_imageAffineTransImageAffineTransImage,
hom_mat2d_scalehom_mat2d_scaleHomMat2dScalehom_mat2d_scaleHomMat2dScaleHomMat2dScale
hom_mat2d_scalehom_mat2d_scaleHomMat2dScalehom_mat2d_scaleHomMat2dScaleHomMat2dScale,
affine_trans_imageaffine_trans_imageAffineTransImageaffine_trans_imageAffineTransImageAffineTransImage
Foundation