blockproc
in [Matlab]
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From: Kris zenitis on 12 Apr 2010 20:41 Hello to everybody and thank in advance. I have some pictures and i want to divide them into blocks of 9x9. I have found that blockproc can help me for this task but my problem that i can t understand how does work. I wrote to matlab something like that I2 = blockproc(J,[9 9],fun); where J is my picture and then i received the message : ??? Attempt to reference field of non-structure array. Error in ==> blockproc at 70 firstBlock = feval(fun,x,params{:}); Any idea??
From: ImageAnalyst on 12 Apr 2010 21:20 Kris: I don't know if that will work. What is fun? Maybe you can try it like this demo I have for splitting up the standard gray scale demo image up into 8 by 8 chunks: clc; % Clear the command window. close all; % Close all figures (except those of imtool.) clear all; % Erase all existing variables. workspace; % Make sure the workspace panel is showing. fontSize = 12; % Change the current folder to the folder of this m-file. % (The line of code below is from Brett Shoelson of The Mathworks.) if(~isdeployed) cd(fileparts(which(mfilename))); end % Read in standard MATLAB grayscale demo image. grayImage = imread('cameraman.tif'); subplot(8, 9, 1); imshow(grayImage, []); title('Original Grayscale Image', 'FontSize', 8); set(gcf, 'Position', get(0,'Screensize')); % Maximize figure. [rows columns numberOfColorBands] = size(grayImage) counter = 1; for col = 1:32:columns for row = 1:32:rows subImage{counter} = grayImage(row:row+31, col:col+31); subplot(8,9,counter+1); imshow(subImage{counter}); caption = sprintf('Block #%d', counter); title(caption, 'FontSize', fontSize); counter = counter + 1; end end
From: Ashish Uthama on 13 Apr 2010 07:05 On Mon, 12 Apr 2010 21:38:03 -0300, Kris zenitis <gio.1988(a)hotmai.com> wrote: > Hello to everybody and thank in advance. I have some pictures and i want > to divide them into blocks of 9x9. I have found that blockproc can help > me for this task but my problem that i can t understand how does work. I > wrote to matlab something like that I2 = blockproc(J,[9 9],fun); where J > is my picture and then i received the message : > > ??? Attempt to reference field of non-structure array. > > Error in ==> blockproc at 70 > firstBlock = feval(fun,x,params{:}); > > Any idea?? Can you tell/show us the code for the function handle 'fun' ?
From: Ashish Uthama on 13 Apr 2010 07:07
On Mon, 12 Apr 2010 21:41:05 -0300, Kris zenitis <gio.1988(a)hotmai.com> wrote: > Hello to everybody and thank in advance. I have some pictures and i want > to divide them into blocks of 9x9. I have found that blockproc can help > me for this task but my problem that i can t understand how does work. I > wrote to matlab something like that I2 = blockproc(J,[9 9],fun); where J > is my picture and then i received the message : > > ??? Attempt to reference field of non-structure array. > > Error in ==> blockproc at 70 > firstBlock = feval(fun,x,params{:}); > > Any idea?? my guess is that your code in the function handle fun is "??? Attempting to reference field of non-structure array." :) like so perhaps: >> a=1:10 a = 1 2 3 4 5 6 7 8 9 10 >> a.g ??? Attempt to reference field of non-structure array. |