How do i mask green pixels?

Question

Yoon ThiriZaw 2018-6-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403793-how-do-i-mask-green-pixels

评论： Image Analyst 2020-5-2

i am doing plant disease detection and classification. i do preprocessing step, then image segmentation. In segmentation, i do background removal in RGB image using color thresholder app in matlab. Then, i will do masking green pixels, the pixels where the level of green is higher than red and blue are identified and removed by application of the mask. This is based on the fact that these green pixels most probably represent healthy areas in the leaves. Thus, after removing the background and green pixels, the region left in an image is the region of our interest. How do i mask green pixels? Please, answer me! This is my main code:

a = imread('LB.jpg');
subplot(2,3,1);
imshow(a);title('Input Image');
b = rgb2gray(a);
subplot(2,3,2);
imshow(b);title('Grey Image');
c = medfilt2(b,[3 3]);
subplot(2,3,3);
imshow(c);title('Filtered Image using 3*3 window');
[bw,rgb] = background_removal(a);
subplot(2,3,4);
imshow(bw);title('Binary Image');
subplot(2,3,5);
imshow(rgb);title('Background Removed');
And, this code is background removing using color thresholder in matlab:
% Auto-generated by colorThresholder app on 26-Mar-2018
%-------------------------------------------------------
function [BW,maskedRGBImage] = createMask(RGB)
% Convert RGB image to chosen color space
RGB = im2double(RGB);
cform = makecform('srgb2lab', 'AdaptedWhitePoint', whitepoint('D65'));
I = applycform(RGB,cform);
% Define thresholds for channel 1 based on histogram settings
channel1Min = 0.408;
channel1Max = 99.533;
% Define thresholds for channel 2 based on histogram settings
channel2Min = -27.701;
channel2Max = 14.325;
% Define thresholds for channel 3 based on histogram settings
channel3Min = 5.282;
channel3Max = 50.539;
% Create mask based on chosen histogram thresholds
BW = (I(:,:,1) >= channel1Min ) & (I(:,:,1) <= channel1Max) & ...
    (I(:,:,2) >= channel2Min ) & (I(:,:,2) <= channel2Max) & ...
    (I(:,:,3) >= channel3Min ) & (I(:,:,3) <= channel3Max);
% Initialize output masked image based on input image.
maskedRGBImage = RGB;
% Set background pixels where BW is false to zero.
maskedRGBImage(repmat(~BW,[1 1 3])) = 0;

Thanks!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

ARCHANA KUMARI 2020-4-23

Have u completed this project? I need some help in this project.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KALYAN ACHARJYA 2018-6-3

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403793-how-do-i-mask-green-pixels#answer_322994

编辑：KALYAN ACHARJYA 2018-6-3

 % code
%Concept Learned from Image Analyst Sir
k=imread('flower.jpg');
mask=(k(:,:,2)>k(:,:,1)) & (k(:,:,2)>k(:,:,3));
threshold_image=bsxfun(@times, k, cast(imcomplement(mask), 'like', k));
subplot(121),imshow(k);
subplot(122),imshow(threshold_image);