how to make pixels to black if it is more or less than threshold

2 次查看（过去 30 天）

javeed miyandad 2011-3-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2676-how-to-make-pixels-to-black-if-it-is-more-or-less-than-threshold

sir i have a image of size 320X640 and it has divided into blocks of size 32X64 ie totally i have 100 blocks and and number of black pixel in each block is stored in a matrix (10X10)

now i need to make EACH BLOCK black if number of black pixels in each block is more or less(><)than 211 how can it be done plz help me

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2011-3-7

That's a peculiar condition. How likely is it that the blocks of your image will have _exactly_ 211 black pixels ??

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Sean de Wolski 2011-3-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2676-how-to-make-pixels-to-black-if-it-is-more-or-less-than-threshold#answer_4173

在 MATLAB Online 中打开

Call the below function with blkproc:

X = blkproc(I,[64 32],@Black211)

%%Save the below as Black211.m

 function out = Black211(in)
%If there are not exactly 211 black pixels; make the whole thing black
is211black = sum(~in(:))==211;
if ~is211black
    out = false(size(in));
else
    out = in;
end

4 个评论
显示 2更早的评论隐藏 2更早的评论

Brett Shoelson 2011-3-7

Or...you could use the improvements to BLOCKPROC as a compelling reason (one of many!) to update your MATLABs! :)

Sean de Wolski 2011-3-7

Brett, that could possibly require a walk through this New England downpour to a building about 500ft away. Are the blockproc improvements really that good?!?! ;)

请先登录，再进行评论。