emphasizeemphasizeEmphasizeEmphasizeemphasize (算子)

名称

emphasizeemphasizeEmphasizeEmphasizeemphasize — 增强图像的对比度。

签名

emphasize(Image : ImageEmphasize : MaskWidth, MaskHeight, Factor : )

描述

算子 emphasizeemphasizeEmphasizeEmphasizeEmphasizeemphasize emphasizes high frequency areas of the image (edges and corners). The resulting images appears sharper.

First the procedure carries out a filtering with the low pass (mean_imagemean_imageMeanImageMeanImageMeanImagemean_image). The resulting gray values (res) are calculated from the obtained gray values (mean) and the original gray values (orig) as follows: res := round((orig - mean) * Factor) + orig FactorFactorFactorFactorfactorfactor serves as measurement of the increase in contrast. The division frequency is determined via the size of the filter matrix: The larger the matrix, the lower the division frequency.

As an edge treatment the gray values are mirrored at the edges of the image. Overflow and/or underflow of gray values is clipped.

注意

请注意，若使用域缩减后的图像作为输入，滤波器算子可能会返回意外结果。请参阅滤波器一章

执行信息

多线程类型：可重入（与非独占算子并行运行）。
多线程作用域：全局（可从任何线程调用）。
在元组级别上自动并行化。
在通道级别上自动并行化。
在域级别上自动并行化。

参数

ImageImageImageImageimageimage (输入对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

Image to be enhanced.

ImageEmphasizeImageEmphasizeImageEmphasizeImageEmphasizeimageEmphasizeimage_emphasize (输出对象) (multichannel-)image(-array) → object (byte / int2 / uint2)

contrast enhanced image.

MaskWidthMaskWidthMaskWidthMaskWidthmaskWidthmask_width (输入控制) extent.x → (integer)

Width of low pass mask.

默认值： 7

建议值： 3, 5, 7, 9, 11, 15, 21, 25, 31, 39

值范围： 3 ≤ MaskWidth MaskWidth MaskWidth MaskWidth maskWidth mask_width

最小增量： 2

建议增量： 2

MaskHeightMaskHeightMaskHeightMaskHeightmaskHeightmask_height (输入控制) extent.y → (integer)

Height of the low pass mask.

默认值： 7

建议值： 3, 5, 7, 9, 11, 15, 21, 25, 31, 39

值范围： 3 ≤ MaskHeight MaskHeight MaskHeight MaskHeight maskHeight mask_height

最小增量： 2

建议增量： 2

FactorFactorFactorFactorfactorfactor (输入控制) real → (real)

Intensity of contrast emphasis.

默认值： 1.0

建议值： 0.3, 0.5, 0.7, 1.0, 1.4, 1.8, 2.0

值范围： 0.0 ≤ Factor Factor Factor Factor factor factor (sqrt)

建议增量： 0.2

示例（HDevelop）

read_image(Image,'mreut')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,Mask)
emphasize(Mask,Sharp,7,7,2.0)
dev_display (Sharp)

示例（C）

read_image(&Image,"mreut");
disp_image(Image,WindowHandle);
draw_region(&Region,WindowHandle);
reduce_domain(Image,Region,&Mask);
emphasize(Mask,&Sharp,7,7,2.0);
disp_image(Sharp,WindowHandle);

示例（HDevelop）

read_image(Image,'mreut')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,Mask)
emphasize(Mask,Sharp,7,7,2.0)
dev_display (Sharp)

示例（HDevelop）

read_image(Image,'mreut')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,Mask)
emphasize(Mask,Sharp,7,7,2.0)
dev_display (Sharp)

示例（HDevelop）

read_image(Image,'mreut')
dev_display (Image)
draw_region(Region,WindowHandle)
reduce_domain(Image,Region,Mask)
emphasize(Mask,Sharp,7,7,2.0)
dev_display (Sharp)

结果

如果参数值正确，算子 emphasizeemphasizeEmphasizeEmphasizeEmphasizeemphasize 返回值 2 ( H_MSG_TRUE)当输入为空（无可用输入图像）时可设置行为通过算子 set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>)。如有必要，则抛出异常。

可能的后继

disp_imagedisp_imageDispImageDispImageDispImagedisp_image

替代

mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, sub_imagesub_imageSubImageSubImageSubImagesub_image, laplacelaplaceLaplaceLaplaceLaplacelaplace, add_imageadd_imageAddImageAddImageAddImageadd_image

另见

mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, highpass_imagehighpass_imageHighpassImageHighpassImageHighpassImagehighpass_image

模块

基础

算子