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Description: 我们给出一个模板 和一幅图象 。不难发现原图中左边暗，右边亮，中间存在着一条明显的边界。进行模板操作后的结果如下： 。
可以看出，第3、4列比其他列的灰度值高很多，人眼观察时，就能发现一条很明显的亮边，其它区域都很暗，这样就起到了边沿检测的作用。
为什么会这样呢？仔细看看那个模板就明白了，它的意思是将右邻点的灰度值减左邻点的灰度值作为该点的灰度值。在灰度相近的区域内，这么做的结果使得该点的灰度值接近于0；而在边界附近，灰度值有明显的跳变，这么做的结果使得该点的灰度值很大，这样就出现了上面的结果。
这种模板就是一种边沿检测器，它在数学上的涵义是一种基于梯度的滤波器，又称边沿算子，你没有必要知道梯度的确切涵义，只要有这个概念就可以了。梯度是有方向的，和边沿的方向总是正交(垂直)的，例如，对于上面那幅图象的转置图象，边是水平方向的，我们可以用梯度是垂直方向的模板 检测它的边沿。
例如，一个梯度为45度方向模板 ，可以检测出135度方向的边沿。-we give a template and an image. It is not difficult to find the maximum were left dark, right-liang, in the middle there is a clear boundary. After the template for the operation results are as follows :. Can be seen, three, four out other than the gray value is much higher, eye observation, we can obviously found a bright side. Other regions are dark, and this has played a role in the detection of 2500. Why is this the case? A closer look at the template on which to understand it. It means the right to the point o gray minus left point as a gray value of the point of gray values. In a similar gray area, do so as a result of the point of gray values close to 0; And near the border. gray values jump significantly changed, the results do make the point very gray value, and this appeared to
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Size: 9216 |
Author: 李涯 |
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Description: Visual C++MATLAB图像处理与识别实用案例精选之亮度增强的例子-Visual C MATLAB image processing and recognition practical case's best examples of enhanced brightness
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Size: 186368 |
Author: 路香群 |
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Description: MATLAB 图像处理命令
相关命令：
bwarea, bweuler, bwfill
功能：
增加或降低颜色映像表的亮度-matlab语句 ．applylut bestblk 4．brighten
功能：
增加或降低颜色映像表的亮度。
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Size: 427008 |
Author: jk |
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Description:
cntrd: calculates the centroid of bright spots to sub-pixel accuracy.
Inspired by Grier & Crocker s feature for IDL, but greatly simplified and optimized
for matlab
INPUTS:
im: image to process, particle should be bright spots on dark background with little noise
ofen an bandpass filtered brightfield image or a nice fluorescent image
mx: locations of local maxima to pixel-level accuracy from pkfnd.m
sz: diamter of the window over which to average to calculate the centroid.
should be big enough
to capture the whole particle but not so big that it captures others.
if initial guess of center (from pkfnd) is far from the centroid, the
window will need to be larger than the particle size. RECCOMMENDED
size is the long lengthscale used in bpass plus 2.
interactive: OPTIONAL INPUT set this variable to one and it will show you the image used to calculate
each centroid, the pixel-level peak and the centroid-
cntrd: calculates the centroid of bright spots to sub-pixel accuracy.
Inspired by Grier & Crocker s feature for IDL, but greatly simplified and optimized
for matlab
INPUTS:
im: image to process, particle should be bright spots on dark background with little noise
ofen an bandpass filtered brightfield image or a nice fluorescent image
mx: locations of local maxima to pixel-level accuracy from pkfnd.m
sz: diamter of the window over which to average to calculate the centroid.
should be big enough
to capture the whole particle but not so big that it captures others.
if initial guess of center (from pkfnd) is far from the centroid, the
window will need to be larger than the particle size. RECCOMMENDED
size is the long lengthscale used in bpass plus 2.
interactive: OPTIONAL INPUT set this variable to one and it will show you the image used to calculate
each centroid, the pixel-level peak and the centroid
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Size: 2048 |
Author: santhu |
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Description: 图像预处理-图像去噪方面-滤波器-matlab的实现程序，非常清晰- ADJGAMMA- Adjusts image gamma.
function g = adjgamma(im, g)
Arguments:
im - image to be processed.
g - image gamma value.
Values in the range 0-1 enhance contrast of bright
regions, values > 1 enhance contrast in dark
regions.
Peter Kovesi
School of Computer Science & Software Engineering
The University of Western Australia
pk @ csse uwa edu au
http://www.cs.uwa.edu.au/~pk
July 2001
function newim = adjgamma(im, g)
if g <= 0
error( Gamma value must be > 0 )
end
if isa(im, uint8 )
newim = double(im)
else
newim = im
end
rescale range 0-1
newim = newim-min(min(newim))
newim = newim./max(max(newim))
newim = newim.^(1/g) Apply gamma function
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Size: 1024 |
Author: kakarot |
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Description: Brightness is one of the most significant pixel characteristics.
It is involved in many image-editing algorithms such as contrast or
shadow/highlight.
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Size: 8192 |
Author: akash |
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Description: 产生右图所示亮块图像 f1(x,y)（128×128大小，暗处=0，亮处=255），对其进行FFT，同屏显示原图f1和FFT(f1)的幅度谱图，若令f2(x,y)=（-1）x+y f1(x,y)，重复以上过程。以及旋转45度后进行变换-Generating shown bright block image F1 (x, y) (128128 size dark = 0, light at = 255), the FFT, the same screen display Original f1 and FFT (f1) of the amplitude spectrum FIG Let f2 (x, y) = (-1) x+y f1 (x, y), the above process is repeated. And rotated by 45 degrees to transform
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Size: 250880 |
Author: LyndonZhang |
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Description: 单幅图象的暗原色先验去雾改进算法，能够很好地改进天空或明亮部分色彩失真，matlab代码注解详细，能很好地帮助理解算法过程。-improvement of a single image dehazing algorithm using dark channel prior,solving the problem of color distortion of sky and bright part!Having a good explain of the code,which
could be helpful to understand the processing of the algorithm!
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Size: 414720 |
Author: jack |
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Description: 用matlab实现的白平衡算法，检测图像中的高亮点作为理想白点，计算校正系数-Use white balance algorithm matlab realize, the the detection image bright spot as the ideal white point, calculate the correction factor
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Size: 164864 |
Author: 王栋 |
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Description: matlab使用教程，分章讲解，清晰明朗，内容丰富，适合初学者-Matlab using the tutorial, sub-chapter explanation, clear and bright, rich in content, suitable for beginners
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Size: 8527872 |
Author: 褚亚齐 |
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Description: 该程序主要是通过matlab获得线pattern和二值化patttern。看到的效果是：一幅图中只有一条亮线，其余全部为黑色；一幅图中黑白间隔的图像-The program is mainly obtained through matlab line pattern. See the effect that: a figure only a bright line, all the rest is black
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Size: 1024 |
Author: 李娜 |
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Description: 该程序主要是对一幅图像进行动漫风格化
总体上，把照片变成动漫化风格分以下几步：
（1）膨胀图片让其亮暗分明
（2）区域平滑
（3）增强锐化，以突出显示边缘线条。(The program is mainly a cartoon style animation style
On the whole, take the photo into the animation style and divide the following steps.
(1) the expansive picture makes it bright and dark
(2) regional smoothness
(3) sharpening to highlight the edge lines.)
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Size: 678912 |
Author: Liu0_
|
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Description: 将亮的红绿灯圈出来_并在圈内显示红绿灯颜色
图像找到红绿灯位置_判断红绿灯哪个亮
指定位置_最大灰度值_判断亮灭(Circle the bright traffic lights _ and display the traffic lights in the circle
Image find traffic light position _ judge which light is green
Specify position _ maximum gray value _ judgment light off)
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Size: 523264 |
Author: DingXianghai |
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Description: 用matlab进行光学仿真，验证了泊松亮斑的形成。(The formation of Poisson's bright spot is verified by the optical simulation with MATLAB.)
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Size: 28672 |
Author: 双余余余 |
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