WP Add Option to Crop Medium Image

function crop_settings_api_init() {
  // Add the section to media settings
  add_settings_section(
    'crop_settings_section',
    'Crop images',
    'crop_settings_callback_function',
    'media'
  );
  // Add the fields to the new section
  add_settings_field(
    'medium_crop',
    'Medium size crop',
    'crop_medium_callback_function',
    'media',
    'crop_settings_section'
  );
  add_settings_field(
    'large_crop',
    'Large size crop',
    'crop_large_callback_function',
    'media',
    'crop_settings_section'
  );
  register_setting( 'media', 'medium_crop' );
  register_setting( 'media', 'large_crop' );
} // crop_settings_api_init()

add_action( 'admin_init', 'crop_settings_api_init', 1 );

// Settings section callback function
function crop_settings_callback_function() {
    echo '<p>Choose whether to crop the medium and large size images</p>';
}
// Callback function for our medium crop setting
function crop_medium_callback_function() {
  echo '<input name="medium_crop" type="checkbox" id="medium_crop" value="1"';
    $mediumcrop = get_option( "medium_crop");
    if ( $mediumcrop == 1 ) {
        echo ' checked';
  }
  echo '/>';
  echo '<label for="medium_crop">Crop medium to exact dimensions</label>';
}
// Callback function for our large crop setting
function crop_large_callback_function() {
  echo '<input name="large_crop" type="checkbox" id="large_crop" value="1"';
    $largecrop = get_option( "large_crop");
    if ( $largecrop == 1 ) {
        echo ' checked';
  }
  echo '/>';
  echo '<label for="large_crop">Crop large to exact dimensions</label>';
}