Change default image size

I have three image up-loader plugin all different size

one is 120*120, two is 170*170 and last one is 240*100

i want to upload only one image for each plugin. now it is upload all default size and new size that is more than 8 images.

when i remove default size, it is effecting all post and page image uploadings.

removing function is :

add_action('init', 'ai_main_banner');
function ai_main_banner()
{

	function sgr_filter_image_sizes( $sizes) {

	unset( $sizes['thumbnail']);
	unset( $sizes['medium']);
	unset( $sizes['large']);
	unset( $sizes['full']);

	return $sizes;
}
add_filter('intermediate_image_sizes_advanced', 'sgr_filter_image_sizes');
add_image_size( 'home_banner', 120, 120, true );

when i upload images from page or post i want to upload all default size and when i upload images from new plugins i want to upload only one defined size images. how can i do this

i don’t want default image size