The king has recently stepped back from public engagements due to ill health.
The military junta that took power after last year's coup declared protection of the monarchy a priority.
An increase in lese majeste cases under recent civilian governments accelerated with last year's coup and the cases have been handled by military courts instead of civilian ones.
Many recent cases have involved content posted on social media.
On Thursday, a military court in Chiang Rai province sentenced a man to five years - halved from 10 - to tearing up a portrait of King Bhumibol.
His lawyer had asked for leniency on the grounds that his client suffered from mental illness.