1. A processing system for multiple input object force estimation, comprising: sensor circuitry configured to acquire a plurality of measurements of a sensing region using a plurality of sensor electrodes; processing circuitry connected to the sensor circuitry and configured to: obtain a delta image of the sensing region using the plurality of measurements; identify a plurality of locations of a plurality of input objects in the sensing region using the delta image; identify a plurality of flattened model force images using the plurality of locations of the plurality of input objects; determine a force estimate for each input object of the plurality of input objects by performing a linear solve on the delta image using the plurality of flattened model force images; and perform an action based on the force estimate of each input object of the plurality of input objects.