Count people in a crowd from distance of 120 meters

Hi, i have an image which was taken from a drone with a distance of 120 meters. Please i need help on the possible way to count the number of person on the image. The sample image is attached.

Answer 1

[Image Analyst]

See section 16.7.4.2.9 of VisionBib for algorithms:

16.7.4 Human Motion Understanding and Analysis

• 16.7.4.1 Human Motion Understanding and Analysis, Surveys, Reviews, Evaulations
• 16.7.4.2 Human Detection, People Detection, Pedestrians, Locating
• 16.7.4.2.1 Learning, Neural Nets for Human Detection, People Detection, Pedestrians
• 16.7.4.2.2 Local Features, LBP, Patterns, for Pedestrian Detection, People Detection
• 16.7.4.2.3 HoG, Gradients, Histogram of Gradients for Human Detection, People Detection, Pedestrians
• 16.7.4.2.4 Motion Based Human Detection, Spatio-Temporal Analysis, Pedestrians
• 16.7.4.2.5 Human Detection, People Detection, Pedestrians, Using Depth, Stereo
• 16.7.4.2.6 Human Detection, People Detection, Pedestrians, Using Body Parts, Body Shape
• 16.7.4.2.7 Surveys, Evaluation, Datasets, Human Detection, People Detection, Pedestrians
• 16.7.4.2.8 Counting People, Transportation System Monitoring, Queues
• 16.7.4.2.9 Counting People, Crowds, Crowd Counting

Sorry I don't have source code (and can't code up a paper for you) so contact the authors. Only they will have it.