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 和 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)。当输入为空时，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
entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray
另见
energy_gaborenergy_gaborEnergyGaborEnergyGaborEnergyGaborenergy_gabor,
entropy_grayentropy_grayEntropyGrayEntropyGrayEntropyGrayentropy_gray
模块
基础