WordPress resizes image to the same size as uploaded

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If you are uploading images the same size as the large size in your WordPress installation, then set your Large size to 0x0 in Settings -> Media or remove this line:

add_image_size( 'large-size',  $LARGE_SIZE, 9999 );

EDIT #1:

Try to add this filter to delete the original image:

add_filter('wp_generate_attachment_metadata', 'delete_fullsize_image');
function delete_fullsize_image($metadata) {
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit($upload_dir['basedir']) . $metadata['file'];
    $deleted = unlink($full_image_path);

    return $metadata;
}

It will delete the original image after upload and keep only the generated ones.

EDIT #2:

Check these two plugins (untested), they might help you do it automatically:

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