Why the G color plane curve of four different groups of image plotted against another constant variables has different shape from its average value?

Question

satish thapaliya 2012-12-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55962-why-the-g-color-plane-curve-of-four-different-groups-of-image-plotted-against-another-constant-varia

I have seven green colour images of different intensities at different spatial positions. i used four different positions to find out the difference in color plane results.the green color plane curve plotted against another constant variables of these images produce dissimilar curve shape(i.e. green color plane value differs when i change its position in x-axes). what could be the reason a same image has different green color plane value at different positions. the codes that i had used in this task is: a=0.85; for i=3:9 filename=strcat('D:\2nd year\EXP season 2\Dry\cat1\',num2str(i),'.bmp'); I=imread(filename); I1=I(:,:,2); I2=I(:,:,3); G_channel_cat1(i-2)=mean(mean(I1(293+(-5:5),250+(-5:5))))-mean(mean(I2(293+(-5:5),250+(-5:5))))*a; end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2012-12-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55962-why-the-g-color-plane-curve-of-four-different-groups-of-image-plotted-against-another-constant-varia#answer_67794

I'm not sure what you're saying. It's like you're asking "How can different images have different values in the green channel?" But that can't be it because the answer to that is obvious. So can you rephrase what you're asking and perhaps upload some images, diagrams, plots, screenshots, code, or anything else that might help illustrate your situation? Also explain exactly what are "the other constant variables".

5 个评论
显示 3更早的评论隐藏 3更早的评论

satish thapaliya 2012-12-7

actually its the G channel curve against IgE concentration that i want to plot form images of the allergen cards used in ELISA reaction. i had seven different serum sample(with differen antibody concentration) so it produced seven different colored products. I used the images of those color product to obtain G channel value and as i had already known the antibody(IgE) concentration i plotted the curve by using G channel value against IgE concentration. i used the same seven images again in another group in different position to get the g channel value but the result was different. i repeated the process four times and plotted four different curves but the curve shape was not similar and the shape of curve obtained by using average G channel value(for seven images) from four groups was also not similar. What may be the cause? the whole code for four groups(with images i=3:9) was

a=0.85; for i=3:9 filename=strcat('D:\2nd year\EXP season 2\Dry\cat1\',num2str(i),'.bmp'); I=imread(filename); I1=I(:,:,2); I2=I(:,:,3); G_channel_cat1(i-2)=mean(mean(I1(293+(-5:5),250+(-5:5))))-mean(mean(I2(293+(-5:5),250+(-5:5))))*a; end for i=3:9 filename=strcat('D:\2nd year\EXP season 2\Dry\cat2\',num2str(i),'.bmp'); I=imread(filename); I1=I(:,:,2); I2=I(:,:,3); G_channel_cat2(i-2)=mean(mean(I1(301+(-5:5),250+(-5:5))))-mean(mean(I2(301+(-5:5),250+(-5:5))))*a; end for i=3:9 filename=strcat('D:\2nd year\EXP season 2\Dry\cat3\',num2str(i),'.bmp'); I=imread(filename); I1=I(:,:,2); I2=I(:,:,3); G_channel_cat3(i-2)=mean(mean(I1(310+(-5:5),250+(-5:5))))-mean(mean(I2(310+(-5:5),250+(-5:5))))*a; end for i=3:9 filename=strcat('D:\2nd year\EXP season 2\Dry\cat4\',num2str(i),'.bmp'); I=imread(filename); I1=I(:,:,2); I2=I(:,:,3); G_channel_cat4(i-2)=mean(mean(I1(316+(-5:5),250+(-5:5))))-mean(mean(I2(316+(-5:5),250+(-5:5))))*a; end x=[0.121,0.422,0.844,4.219,12.053,21.094,60.267]; for i=1:7 y(i)=(G_channel_cat1(i)+G_channel_cat2(i)+G_channel_cat3(i)+G_channel_cat4(i))/4; end plot(y,x,'r')

Image Analyst 2012-12-7

Again, a picture would be helpful. Also outline the regions of interest so we can see what you're looking at.

satish thapaliya 2012-12-8

I don't know how could I upload the image here?

请先登录，再进行评论。

Why the G color plane curve of four different groups of image plotted against another constant variables has different shape from its average value?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

5 个评论
显示 3更早的评论隐藏 3更早的评论

另请参阅

类别

标签

Community Treasure Hunt

Why the G color plane curve of four different groups of image plotted against another constant variables has different shape from its average value?

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

5 个评论 显示 3更早的评论隐藏 3更早的评论

另请参阅

类别

标签

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

5 个评论
显示 3更早的评论隐藏 3更早的评论