POI Scanner 1.4.11 + all the custom pushpins
New settings are available in the version to accelerate the pixels scans.

A setting of 1 is the most reliable, but the slowest and the most CPU intensive. Some of the custom push pins I have created are reliable with a setting of up to 10 skipped pixels. The small red lights are up to 3 only. The colored pixel strings are only 4 pixels in length. If you wish to virtually turn off a color, you can set the skipped pixels to 20 with a scan area of 10 meters. This should reduce the chance of a warning sounding off to almost nothing since sometimes the area is smaller than 20 pixels in low zoom levels.
I've included all the custom push pins with the zip file. Added four new police cars. I've also tweaked them to be used with the new pixel search settings.
When there are four of the same, choosing the name of the color will sound off differently.
For example:
police car_red.bmp will play the ding.wav
police car_purple.bmp will play the chimes.wav
police car_yellow.bmp will play the notify.wav
police car_orange.bmp will play the chord.wav