How to use IF with @(block_struct) function

조회 수: 24(최근 30일)
Saud Alfalasi
Saud Alfalasi 2020년 11월 22일
편집: Saud Alfalasi 2020년 11월 24일
fun2 = @(block_struct) ...
if block_struct.data < 100
std2(block_struct.data) * (block_struct.data));
end
Doesnt work.
I actually want to manipulate individual elements of my block
blocks made of 8x8 values ranging from 0-255
  댓글 수: 2
Saud Alfalasi
Saud Alfalasi 2020년 11월 22일
Hi Geoff
blockyImageR = blockproc(redChannel, blockSize, fun);
blockyImageG = blockproc(greenChannel, blockSize, fun);
blockyImageB = blockproc(blueChannel, blockSize, fun);
blockyImageR(1)
blockyImageG(1)
blockyImageB(1)
rgbImage2 = cat(3, blockyImageR, blockyImageG, blockyImageB);
imshow(rgbImage2)
I'm trying to create a method of LSB insertation based on a sequece to do with individual blocks.
Just as a test I'm trying to only change values of numbers in my block according to the values.
the data field is is part of the array with is a 9x9x1 block
I would also like to try and pinpoint the minddle value of my block (coordinates 2,2) and do a quoteince differnce betwen it and the surrounding values.
Ideally what I want to do is not only change values in blocks but also manage the sequence of movement from block to block - example follwing some kind of sequence which results in going from block1 > block 7 > block 27

댓글을 달려면 로그인하십시오.

채택된 답변

Athul Prakash
Athul Prakash 2020년 11월 24일
Hi Saud,
Since blockproc uses anonymous functions, you may save your multi-line function into a script, say myFunc.m and then pass @myFunc to your blockproc call.
You can find block_struct structure described in the following doc (under More About section): 'blockproc' Documentation.
You may work out a way to manage the sequence artificially using some of those fields. For example, using block_struct.location to skip processing the 2nd block:
function out = myFunc(block_struct) % size would be 100x100
if(block_struct.location(2)==101)
% skipping the 2nd block.
out = block_struct.data;
else
% code for processing every other element
end
end
Hope it helps!
  댓글 수: 3
Saud Alfalasi
Saud Alfalasi 2020년 11월 24일
Blow away, you gave great help. Answer has been accepted. May I ask if you're contactable in any way? I could do with some guidance
Saud

댓글을 달려면 로그인하십시오.

추가 답변(0개)

Community Treasure Hunt

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

Start Hunting!

Translated by