entropy_imageentropy_imageEntropyImageEntropyImageentropy_image (算子)
名称
entropy_imageentropy_imageEntropyImageEntropyImageentropy_image — 计算矩形窗口内灰度值的熵。
签名
描述
entropy_imageentropy_imageEntropyImageEntropyImageEntropyImageentropy_image calculates the entropy of gray values in the
image ImageImageImageImageimageimage within a rectangular mask of size
(HeightHeightHeightHeightheightheight, WidthWidthWidthWidthwidthwidth). The resulting image is
returned in ImageEntropyImageEntropyImageEntropyImageEntropyimageEntropyimage_entropy, in which the entropy is
multiplied by 32. If the parameters HeightHeightHeightHeightheightheight and
WidthWidthWidthWidthwidthwidth are even, they are changed to the next larger odd
value. At the image borders the gray values are mirrored.
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) → objectHImageHObjectHImageHobject (byte)
Image for which the entropy is to be calculated.
ImageEntropyImageEntropyImageEntropyImageEntropyimageEntropyimage_entropy (输出对象) (multichannel-)image(-array) → objectHImageHObjectHImageHobject * (byte)
Entropy image.
WidthWidthWidthWidthwidthwidth (输入控制) extent.x → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Width of the mask in which the entropy is calculated.
默认值：
9
建议值：
3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25
限制：
3 <= Width && odd(Width)
HeightHeightHeightHeightheightheight (输入控制) extent.y → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Height of the mask in which the entropy is calculated.
默认值：
9
建议值：
3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25
限制：
3 <= Height && odd(Height)
示例（HDevelop）
read_image(Image,'fabrik')
dev_display(Image)
entropy_image(Image,Entropy,9,9)
dev_display(Entropy)
示例（C）
read_image(&Image,"fabrik");
disp_image(Image,WindowHandle);
entropy_image(Image,&Entropy,9,9);
disp_image(Entropy,WindowHandle);
示例（HDevelop）
read_image(Image,'fabrik')
dev_display(Image)
entropy_image(Image,Entropy,9,9)
dev_display(Entropy)
示例（HDevelop）
read_image(Image,'fabrik')
dev_display(Image)
entropy_image(Image,Entropy,9,9)
dev_display(Entropy)
示例（HDevelop）
read_image(Image,'fabrik')
dev_display(Image)
entropy_image(Image,Entropy,9,9)
dev_display(Entropy)
结果
entropy_imageentropy_imageEntropyImageEntropyImageEntropyImageentropy_image 在所有参数正确时返回 2 ( H_MSG_TRUE )。
如果输入为空则可设置行为通过 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
entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray
另见
energy_gaborenergy_gaborEnergyGaborEnergyGaborEnergyGaborenergy_gabor,
entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray
模块
基础