use a LUT for hough sin/cos
use a LUT for hough sin/cos

lovell/libvips,mcanthony/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips,mcanthony/libvips,lovell/libvips,leiyangyou/libvips,wishabi/libvips,leiyangyou/libvips,wishabi/libvips,leiyangyou/libvips,wishabi/libvips,wishabi/libvips,leiyangyou/libvips,mcanthony/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,mcanthony/libvips