加快PLY文件的读取速度 |
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问题描述
Currently I use the following code segment in MATLAB to read a PLY into a MATLAB matrix. Here is a sample PLY file. But it take a considerable time when the size of the PLY file is quite large. Is there a better way to read a text file efficiently in MATLAB? data = textread(fileName, '%s','delimiter', '\n'); data = data(15:length(data),1); data = (cellfun(@(x) strread(x,'%s','delimiter',' '), data, 'UniformOutput', false));(This question is a part of my previous question listed here.) 推荐答案You can use the dlmread function and make use of its ability to specify a starting position >> data = dlmread(filename, ' ', 14, 0) data = 0.1054 -0.2731 0.8550 220.0000 195.0000 173.0000 255.0000 0 0.1008 -0.2754 0.8550 228.0000 202.0000 184.0000 255.0000 0 ... 0.1139 -0.2803 0.8490 221.0000 194.0000 172.0000 255.0000 0 0.1117 -0.2829 0.8500 225.0000 200.0000 178.0000 255.0000 0The last two arguments specify the starting row and column of the data. The final zeros arise because each of the lines in your test file ends with a space. We can remove these with >> data = data(:, 1:end-1);The dlmread function reads in numeric data and removes the need for the conversion from a string to a double in my previous answer. |
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