绘制自然的日志并获得图像的伽玛

Question

链接b.jpg

i=imread('b.jpg');
i1=rgb2gray(i);
i2=im2double(i);
j=log(1+i2);

1

现在用于获得图像的直方图。

 imhist(j);

说错误：

??? Error using ==> iptcheckinput
Function IMHIST expected its first input, I or X, to be two-dimensional.

Error in ==> imhist>parse_inputs at 270
iptcheckinput(a, {'double','uint8','logical','uint16','int16','single'}, ...

Error in ==> imhist at 57
[a, n, isScaled, top, map] = parse_inputs(varargin{:});

=============================================== ==============================

2.how可以绘制功能的diagrame吗？

     plot(j,i2);

??? Error using ==> plot
Data may not have more than 2 dimensions

=============================================== =============================== 3.如何获得j

的伽玛

Answer 1

我认为，你在开始时犯了一个错误

i=imread('b.jpg');
i1=rgb2gray(i);
i2=im2double(i); % POSSIBLE MISTAKE
i2=im2double(i1);
j=log(1+i2);

在此更正后，（1）imhist(j)和（2）plot(j,i2);都可以正常工作。对于伽玛校正，您可以参考其中任何一项：Link-A，Link-B。