player_methods.py 文件源码

def transparent_image_overlay(pos,overlay_img,img,alpha):
    """
    Overlay one image with another with alpha blending
    In player this will be used to overlay the eye (as overlay_img) over the world image (img)
    Arguments:
        pos: (x,y) position of the top left corner in numpy row,column format from top left corner (numpy coord system)
        overlay_img: image to overlay
        img: destination image
        alpha: 0.0-1.0
    """
    roi = slice(pos[1],pos[1]+overlay_img.shape[0]),slice(pos[0],pos[0]+overlay_img.shape[1])
    try:
        cv2.addWeighted(overlay_img,alpha,img[roi],1.-alpha,0,img[roi])
    except:
        logger.debug("transparent_image_overlay was outside of the world image and was not drawn")
    pass