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Problems in getting pictures

See original GitHub issue

I have found there are two problems when I get photos from the drone. The two function get_latest_valid_picture in DroneVision.py and get_groundcam_picture in Minidrone.py.

When I run the example program many times, they show or give me the picture the drone took in the last execution. The main reason is the way that the source program brings photos to the programmer. The source program a picture from the drone the source program downloads the images into files from the drone and read them from the file. This is because of higher latency between the drone and computer than the source program executes, The program commands the drone to send what it is taking, and the program immediately try to read data, but it takes a little time to receive the image. So, the program reads an old file and shows me those old pictures that the drone took in the last execution.

In order to solve this problem, I have modified the two source codes Minidrone.py and DroneVision.py to delete all the images the drone took and saved in their constructors.

I had a hard time finding the reason and solution of this problem. Have you had the same problem with me ? or, is this a problem only happens to me? If this happens to everyone, I hope you will fix this problem or allow and help me to fix this.