convert image to bitmap map image without using for loop
2 views (last 30 days)
Show older comments
Partition an image into 4 × 4 pixel blocks and
compute average for the block
N1 = N2 = 4
xi = ith pixel
now replace the values to 1 and zero to create a bitmap image.
Without using for loop, how can i write these 2 equations in simple code
0 Comments
Accepted Answer
Image Analyst
on 16 Feb 2019
Edited: Image Analyst
on 16 Feb 2019
Try this:
% Compute mean in 4-by-4 blocks
% kernel = ones(4);
meanImage = conv2(double(grayImage), kernel, 'same') / numel(kernel);
% Compare actual image to mean image.
binaryImage = grayImage >= meanImage;
There will be some errors at the edge of the image where the window does not fit onto the image, like it's only 4 by 3 or whatever. If this is important, then you can use conv2 twice, once to sum the image and once to count the pixels, then divide the gray level sum image from the pixel count image. But usually edge effects are not worth worrying about because they get removed later in the process naturally.
0 Comments
More Answers (0)
See Also
Categories
Find more on Image Processing and Computer Vision in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!