www.gusucode.com > IPCV_Eval_Kit_R2019a_0ce6858工具箱源码程序matlab > IPCV_Eval_Kit_R2019a_0ce6858/code/demo_files/I3_01_1_parfor.m
clear all;clc;close all;imtool close all %% 夋憸偺撉崬傒P搙偲怓嵎惉暘偺暘棧 I = imread('saturn.png'); figure; imshow(I); %% 婸搙偵懳偟偰DCT傪寁嶼 YCbCr = rgb2ycbcr(I); % YCbCr怓嬻娫傊曄姺 fun = @(block_struct) dct2(block_struct.data); % 柍柤娭悢偺僴儞僪儖掕媊 tic; DCTy = blockproc(YCbCr(:,:,1), [8 8],fun); t0=toc imtool(log(abs(DCTy)+1),[]); % 懳悢昞帵 %% 2師尦棧嶶僐僒僀儞曄姺 (Y惉暘偲Cb惉暘) tic; for i = 1:2 DCTycb(:,:,i) = blockproc(YCbCr(:,:,i), [8 8],fun); end t1=toc %% 暲楍寁嶼梡偺 MATLAB 僙僢僔儑儞偺僾乕儖傪奐偔 parpool %% 暲楍張棟偱崅懍壔 tic; parfor i = 1:2 DCT(:,:,i) = blockproc(YCbCr(:,:,i), [8 8],fun); end t2=toc %% 暲楍壔偵傛傞崅懍壔妱崌偺寁嶼乮2夞栚埲崀偱妋擣乯 t2/t1 %% 暲楍寁嶼梡偺 MATLAB 僙僢僔儑儞偺僾乕儖傪暵偠傞 delete(gcp('nocreate')) %% % Copyright 2018 The MathWorks, Inc.