【机器视觉】 dev_set_lut算子

冷不防 2022-10-08 00:44 94阅读 0赞

## 00. 目录 ##

### 文章目录 ###

*   *  00. 目录
     *  01. 概述
     *  02. 签名
     *  03. 描述
     *  04. 注意
     *  05. 参数
     *  06. 结果
     *  07. 附录

## 01. 概述 ##

dev\_set\_lut - 设置“查找表”（lut）。

## 02. 签名 ##

`dev_set_lut( : : LutName : )`

## 03. 描述 ##

dev\_set\_lut设置活动图形窗口的查找表。 查找表定义了将来自单通道图像的“灰度值”转换为屏幕上的灰度值或颜色。 query\_lut列出所有查找表的名称。

有关更多信息，请参阅算子set\_lut的说明。 但是，与算子set\_lut相反，此算子设置的新的查找表也用于之后打开的所有新图形窗口。

**原文描述**：

dev\_set\_lut sets the look-up-table of the active graphics window. A look-up-table defines the transformation of a “gray value” from an one-channel-image into a gray value or color on the screen. query\_lut lists the names of all look-up-tables.

For more information see the description of the operator set\_lut. However, in contrast to that operator the new look-up-table is also used for all new graphics windows that are opened afterwards.

## 04. 注意 ##

使用HDevelop的代码导出功能，为该算子生成的代码可能与相关的HALCON算子具有不同的行为。 有关将HDevelop图形算子导出为不同编程语言的代码的详细说明，请参阅“HDevelop User’s Guide”中的 Code Export -> General Aspects of Code Generation -> Graphics Windows一章。

## 05. 参数 ##

**LutName (input\_control) filename.read → (string)**  
　　Name of look-up-table, values of look-up-table (RGB) or file name.  
　　Default value: ‘default’  
　　Suggested values: ‘default’, ‘linear’, ‘inverse’, ‘sqr’, ‘inv\_sqr’, ‘cube’, ‘inv\_cube’, ‘sqrt’, ‘inv\_sqrt’, ‘cubic\_root’, ‘inv\_cubic\_root’, ‘color1’, ‘color2’, ‘color3’, ‘color4’, ‘three’, ‘six’, ‘twelve’, ‘twenty\_four’, ‘rainbow’, 　　‘temperature’, ‘cyclic\_gray’, ‘cyclic\_temperature’, ‘hsi’, ‘change1’, ‘change2’, ‘change3’  
　　File extension: .lut

**HDevelop例程**

> watersheds\_threshold.hdev Extract watersheds basins using a threshold  
> radiometric\_self\_calibration.hdev Perform a radiometric self calibration of two different cameras  
> histo\_2dim.hdev Calculate a two-dimensional histogram (based on two gray-value channels)  
> gray\_moments.hdev Calculate gray-value moments and approximate by a plane  
> gen\_cooc\_matrix.hdev Calculate a co-occurrence matrix  
> display\_operators.hdev Visualize results  
> dev\_open\_window.hdev Open graphics windows in HDevelop  
> dem.hdev Extract high objects from a digital elevation model  
> cooc\_feature\_matrix.hdev Calculate a co-occurence matrix and derive texture features

**程序示例**

read_image(Image,'mreut')
    dev_set_lut('inverse')
    * For true color only:
    dev_display(Image)

## 06. 结果 ##

如果指定参数的值正确，则dev\_set\_lut返回2（H\_MSG\_TRUE）。 否则会引发异常并返回错误代码。

## 07. 附录 ##

**7.1 机器视觉博客汇总**  
网址：[https://dengjin.blog.csdn.net/article/details/116837497][https_dengjin.blog.csdn.net_article_details_116837497]

[https_dengjin.blog.csdn.net_article_details_116837497]: https://dengjin.blog.csdn.net/article/details/116837497