Image Separated UISegementedControl Contains Space

I use background and splitter images for customization UISegmentedControl. However, a gap appears between the splitter image and the background image for segment control.

Here is a screenshot showing the spaces

And here is the code that I use to set the segment images

UIImage *selectedImage = [[UIImage imageNamed:@"segcontrol_selectround.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 10, 0, 10)];
UIImage *unselectedImage = [[UIImage imageNamed:@"segcontrol_unselectround.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 10, 0, 10)];
UIImage *leftSelected = [UIImage imageNamed:@"segcontrol_leftselected.png"];
UIImage *rightSelected = [UIImage imageNamed:@"segcontrol_rightselected.png"];
UIImage *neitherSelected = [UIImage imageNamed:@"segcontrol_bothunselected.png"];

[segment setBackgroundImage:unselectedImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[segment setBackgroundImage:selectedImage forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[segment setDividerImage:leftSelected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[segment setDividerImage:rightSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[segment setDividerImage:neitherSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

I checked all the separator images and they are the same width and do not contain transparent pixels.

How to remove these spaces from a segmented control?