Burn Grid onto a Series of Images

7 次查看（过去 30 天）
Louise Wilson
Louise Wilson 2019-7-11
评论： Image Analyst 2019-7-13
Hi all-I have a lot of image files and onto each I am trying to place a grid. I'd like to save the grid onto the file, and so produce a new image with the grid in a separate folder. In the end I will have one folder with the original files and a second with the files+grid.
Just now I have this:
for i = 1:fileCount2
png=d2(i).name;
image = imread(png);
imshow(image);
axis on;
[rows, columns, numberOfColorChannels] = size(image);
hold on;
stepSize = 20; % Whatever you want.
for row = 1 : stepSize : rows
line([1, columns], [row, row], 'Color', 'r', 'LineWidth', 1);
end
for col = 1 : stepSize : columns
line([col, col], [1, rows], 'Color', 'r', 'LineWidth', 1);
end
% for x=1:length(fileCount2)
% outputBaseFileName = sprintf('-%4.4d.png', x); %output filename, each frame numbered from 0001
outputFullFileName = fullfile(strcat(outputFolder, '\FramesGrids'), strcat(baseFileName, outputBaseFileName)); %full output filename with .avi file number
imwrite(image, outputFullFileName, 'png'); %write output png file
end
This successfully adds a grid onto the first photo in the folder, and saves a new photo in a separate folder, but the grid is not saved. The grid only shows up when I run the code and produce the figure within Matlab.
So, any advice on how to save the grid? And how to fix my loop so that every photo has a grid added, not just the first?
Thanks in advance!!
  4 个评论
显示 2更早的评论
Walter Roberson
Walter Roberson 2019-7-12
There is a linewidth option for insertshape
You know, it might be easiest to just
%red
YourArray(1:StepSize:Columns, 1:StepSize:Rows, 1) = 255;
YourArray(1:StepSize:Columns, 1:StepSize:Rows, [2 3]) = 0;
if your line width is 1.
Louise Wilson
Louise Wilson 2019-7-12
Thanks! This doesn't give me lines though, it gives me a dotted grid? Kind of looks like the skeleton of a grid. How do I join the dots?
I don't mean linewidth, I mean the distance between the lines, and where exactly the lines go? How do I specify this accurately so the spacing is consistent.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2019-7-12
Simply burn it into the image itself:
grayImage = imread('cameraman.tif');
[rows, columns, numberOfColorchannels] = size(grayImage);
% Make grid every 64 rows
for row = 8 : 64 : rows
grayImage(row, :, :) = 255;
end
% Make grid every 32 columns
for col = 8 : 32 : rows
grayImage(:, col, :) = 255;
end
imshow(grayImage);
0000 Screenshot.png
  5 个评论
显示 3更早的评论
Louise Wilson
Louise Wilson 2019-7-12
Thanks so much for your help!! I finished this code and everything is working great, thanks very much to you.
Image Analyst
Image Analyst 2019-7-13
No, swapping positions wouldn't do it because then the badly-named image would not have been defined yet by the time you call fileparts().
[folder, baseFileName, extentions] = fileparts(image); % Will throw error because image is not defined yet.
image = imread('02052019-0006.png');
But whatever, glad you got it working and thanks for accepting.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Convert Image Type 的更多信息

标签

产品


版本

R2018b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by