hue | 易学教程

Back Projection反向投影

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直方图反向投影是通过给定的直方图信息, 在原图像找到相应的像素分布区域, 其可分为基于像素点的直方图反向投影和基于区域的直方图反向投影两种方法. 经实验表明, 由于存在光照、噪声等干扰因素, 并且图像的许多特性在单一的像素级别上无法确定, 但是可从一组像素确定, 因此前者提取特征点的精度不如后者.对于归一化直方图模型来说, 反向投影图像为一幅表示目标是否可能出现的概率图, 先对图像做平滑处理, 然后寻找反向投影图像中峰值点, 并将该点在原图像中对应的位置作为目标的特征点. 对于规则目标来说, 该点即为目标的质心。 openCV提供有方便的函数，用于Back Projection，其关键函数与用法如下： 1，calcBackProject void calcBackProject( const Mat* images, int nimages, const int * channels, const SparseMat& hist, OutputArray backProject, const float ** ranges, double scale= 1 , bool uniform = true ) 2，calcHist void calcHist( const Mat* images, int nimages, const int * channels, InputArray

Hue webUI设置中文界面

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修改desktop下的setting.py cd /opt/cloudera/parcels/CDH/lib/hue/desktop/core/src/desktop/ vim setting.py 修改 LANGUAGE_CODE = 'zh_CN' #LANGUAGE_CODE = 'en-us' LANGUAGES = [ ('de', ('German')), ('en-us', ('English')), ('es', ('Spanish')), ('fr', ('French')), ('ja', ('Japanese')), ('ko', ('Korean')), ('pt', ('Portuguese')), ('pt_BR', ('Brazilian Portuguese')), ('zh_CN', ('Simplified Chinese')), ] 返回hue目录重新编译 cd /opt/cloudera/parcels/CDH/lib/hue make apps 来源： https://blog.csdn.net/lingeio/article/details/98628947

How to change hue of a texture with GLSL?

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问题 Is there a way to efficiently change hue of a 2D OpenGL texture using GLSL (fragment shader)? Do someone have some code for it? UPDATE: This is the code resulting from user1118321 suggestion: uniform sampler2DRect texture; const mat3 rgb2yiq = mat3(0.299, 0.587, 0.114, 0.595716, -0.274453, -0.321263, 0.211456, -0.522591, 0.311135); const mat3 yiq2rgb = mat3(1.0, 0.9563, 0.6210, 1.0, -0.2721, -0.6474, 1.0, -1.1070, 1.7046); uniform float hue; void main() { vec3 yColor = rgb2yiq * texture2DRect

How to programmatically change the hue of UIImage?

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问题 I am very new to the image processing. I have to implement hue effect in my iPhone application project. Therefore, I need to change the hue of UIImage . Please provide me any sample code or tutorial link for this. Thanks in advance 回答1: First, you need to decide if you are making an image a fixed hue , or rotating the existing hue . Examples of both are shown below. Fixed hue Fixing the hue can be done using the standard drawing tools - just make sure the blend mode is set to kCGBlendModeHue

Changing image hue with Python PIL

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问题 Using Python PIL, I\'m trying to adjust the hue of a given image. I\'m not very comfortable with the jargon of graphics, so what I mean by “adjusting hue” is doing the Photoshop operation called “Hue/saturation”: this is to change the color of the image uniformly as shown below: Original: With hue adjusted to +180 (red): With hue adjusted to -78 (green): FYI, Photoshop uses a scale of -180 to +180 for this hue setting (where -180 equals +180), that may represents the HSL hue scale (expressed

Ambari启动hue报错

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查看/usr/log/hue/error.log 发现如下问题 [24/Nov/2019 16:57:53 ] supervisor ERROR Process /usr/lib/hue/build/env/bin/hue kt_renewer exited abnormally. Restarting it. [24/Nov/2019 16:57:53 ] supervisor ERROR Process /usr/lib/hue/build/env/bin/hue runcpserver exited abnormally. Restarting it. [24/Nov/2019 16:57:54 ] supervisor ERROR Process /usr/lib/hue/build/env/bin/hue runcpserver exited abnormally. Restarting it. [24/Nov/2019 16:57:54 ] supervisor ERROR Process /usr/lib/hue/build/env/bin/hue kt_renewer exited abnormally. Restarting it. [24/Nov/2019 16:57:55 ] supervisor ERROR Process /usr/lib/hue