MATLAB-如何避免出现锯齿状图像? [英] MATLAB - How to avoid a jagged image?

问题描述

如何避免在 MATLAB 中出现锯齿状图像?

How do I avoid a jagged image in MATLAB?

我在MATLAB中打开了一个600 x 600像素的图像，并对图像进行了一些处理.但是，当我保存它时，它看起来是如此模糊和参差不齐.我该怎么办?

I have a 600 x 600 pixels image opened in MATLAB and do some processing on the image. However, when I save it, it looks so blurred and jagged. What should I do?

(此问题与我之前的问题 MATLAB-如何在图像上绘制x，y并保存? )

(This question is related to my previous question, MATLAB - How to plot x,y on an image and save?)

fid = fopen(datafile.txt);
A = textscan(fid,'%f%f%f'); %read data from the file
code = A{1};
xfix = A{2};
yfix = A{3};

for k=1:length(code)
    imagefile=code(k);
    rgb = imread([num2str(imagefile) '.jpg']);
    imshow(rgb);
    hold on;
    x = xfix2(k);
    y = yfix2(k);
    plot(x,y,'-+ b'); % plot x,y on the
    saveas(([num2str(imagefile) '.jpg'])) % Save the image with the same name as it open.
end
hold off

推荐答案

我的猜测是JPEG压缩伪像. JPEG对于包含许多高频成分的数据来说不是一种很好的格式.您是否尝试过降低压缩率?像这样:

My guess would be JPEG compression artifacts. JPEG isn't a great format for data with a lot of high frequency components. Have you tried turning the compression down? Like so:

imwrite(f.cdata,([num2str(imagefile) '.jpg']),'Quality',100);

quality参数的默认值仅为75.在很多情况下都足够了，但是您可能还需要更多.

The default for the quality parameter is only 75. That's plenty for a lot of cases, but you might need more.

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