在MATLAB中以灰度显示图像对比度

我试图用对比度函数将普通图片转换成灰度图像，灰度函数由两个双变量定义：x1，x1。（使用GUI）

这是我的主要职能：

function varargout = EX1b(varargin)

gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
               'gui_Singleton',  gui_Singleton, ...
               'gui_OpeningFcn', @EX1b_OpeningFcn, ...
               'gui_OutputFcn',  @EX1b_OutputFcn, ...
               'gui_LayoutFcn',  [] , ...
               'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end


function EX1b_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;

guidata(hObject, handles);

function varargout = EX1b_OutputFcn(hObject, eventdata, handles) 
varargout{1} = handles.output;



function edit1_Callback(hObject, eventdata, handles)


function edit1_CreateFcn(hObject, eventdata, handles)
if ispc && isequal(get(hObject,'BackgroundColor'),    get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end



function edit2_Callback(hObject, eventdata, handles)


function edit2_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end



function edit3_Callback(hObject, eventdata, handles)


function edit3_CreateFcn(hObject, eventdata, handles)

if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end

function SUBMIT_Callback(hObject, eventdata, handles)


function pushbutton1_Callback(hObject, eventdata, handles)

[filename path]=uigetfile('*.*', 'Select a file')
if(filename==0)
    return
end

[img, map]= imread(fullfile(path, filename));

axes(handles.axes3) %control axes 3 (==input picture)
image(img)
axes(handles.axes7) %control axes7  (==graph)
try
x1Text = get(handles.edit2, 'string');
x2Text = get(handles.edit3, 'string');

x1Val=str2double(x1Text);
x2Val=str2double(x2Text);

grayInput = linspace(0,1);
grayOutput= setAline(grayInput, x1Val, x2Val);
plot(grayInput, grayOutput);
catch
    return
end

axes(handles.axes4)  %control axes 4 (==output picture)

handles.a = imread(fullfile(path, filename));
image (handles.a)
im2 = imContrast(handles.a, x1Val, x2Val);


image(im2)
axis off

这是我正在使用的两个函数：

function im2 = imContrast(im1, x1, x2)

d = 1 / (x2-x1);       %distance between x1 and x2.
%display interface
im2(find(im1<=x1))=0;  %range before x1 (include x1).

im2(find(im1>=x2))=1;  %range after x2 (include x2).

im2(find(im1>x1 & im1 < x2)) = d * (im1(im1>x1 & im1<x2)-x1); %range from x1 to x2 (exclude x1, x2).

end

函数im2=imContrast（im1，x1，x2）
d=1/（x2-x1）；%x1和x2之间的距离。
%显示界面
im2（find（im1=x2））=1；%x2之后的范围（包括x2）。
im2（find（im1>x1&im1x1&im1x1&grayInputx1&grayInput你能发布一个图像和一个我们可以运行的吗？我不确定如何..我正在使用GUI，所以有很多不必要的代码。我尝试只添加相关的代码。我只使用了任何图片，没关系，只要试着创建一个最简单的GUI来重现错误并上传代码。我尝试了..请告诉我这是否正确这就是你的意思。非常感谢你。谢谢你，我发现了问题。你能发布一个图像和一个我们可以运行的吗？我不知道怎么做。我正在使用GUI，所以有很多不必要的代码。我尝试只添加相关的代码。我只使用了任何图片，这并不重要。只要尝试创建一个最简单的GUI来复制错误并上传密码。我试过了。请告诉我这是否是你的意思。非常感谢。谢谢你，我发现了问题
function grayOutput = setAline( grayInput, x1, x2 )

line = 1 / (x2-x1);                 %range from x1 to x2 (exclude x1, x2)

grayOutput(find(grayInput<=x1))=0;  %range before x1 (include x1)

grayOutput(find(grayInput>=x2))=1;  %range after x2 (include x2)

grayOutput(find(grayInput>x1 & grayInput < x2)) = line * (grayInput(grayInput>x1 & grayInput<x2)-x1);

end