I am working on image processing on maps from Google Maps. How can I use ActionScript 3 to strip off the street names?
Since the street name fonts are anti-aliased, a lot variances of colors are used. I can replace colors one by one, but are there any efficient methods?
I have read a related method like:
public function threshold(sourceBitmapData:BitmapData, sourceRect:Rectangle, destPoint:Point, operation:String, threshold:uint, color:uint = 0, mask:uint = 0xFFFFFFFF, copySource:Boolean = false):uint
I implement the method as follow:
var map_size:Rectangle = new Rectangle(0, 0, map.width, map.height);
map_overlay.threshold(map, map_size, new Point(0, 0), '>=', 0xFFB5D29C, 0x00000000, 0xFFFFFF, true);
But I did not work well.
Alternatively, I have also used getPixel and setPixel method to replace colors. However, I am unable to replace color with transparent color:
bitmapdata.setPixel(i, j, 0x00000000); // clear and transparent
Any better solution? or I have to use Google Maps API ?
