Signal processing device and medical observation system

A signal processing device that is connected to a medical observation device that performs an examination inside a subject and outputs an image signal including a plurality of frames output sequentially according to a result of the examination, and that outputs a video signal for display, the signal processing device comprising:

• first internal circuitry configured to execute hardware processing;
• and
• second internal circuitry configured to execute software processing, wherein
• the first internal circuitry outputs the image signal input from the medical observation device, division position information indicating division positions at which a frame of the image signal is divided by a predetermined amount of data into a plurality of sub-frames, and a timing signal indicating processing timing of the software processing to be performed sequentially on each of the plurality of sub-frames, to the second internal circuitry, and generates, based on the image signal that has been subjected to the software processing and input from the second internal circuitry, the video signal for display, the predetermined amount of data at which the frame of the image signal is divided into the plurality of sub-frames being set based on a type of camera connected to the medical observation device, and
• the second internal circuitry sequentially executes, based on the timing signal and the division position information, image processing on each sub-frame in the plurality of sub-frames in the image signal per the predetermined amount of data, through the software processing, and sequentially outputs each sub-frame in the plurality of sub-frames of each frame in the image signal per the predetermined amount of data that has been subjected to the image processing, to the first internal circuitry.