Small but vehement protests have been held since the military seized power from the civilian government on May 22, despite the junta's move to ban all public protests.
The majority have taken place in the Thai capital where demonstrators have become increasingly creative to avoid detection and arrest, including adopting a three-finger salute from the "Hunger Games" films.
The salute has become the unofficial symbol of resistance against the military regime.
"So far the situation is quiet," he added.
Political assemblies of more than five people were banned under martial law declared by Army Chief Prayut two days before he seized power in a coup three weeks ago.
His troops have so far taken a relatively light touch to policing the near daily rallies, making more than a dozen arrests but not using force.
On Friday the junta said it had captured a prominent anti-coup figure Sombat Boonngamanong who had spearheaded an online campaign to stage illegal flashmob rallies against the military takeover.
A 'We are all Sombat' Facebook page established since his detention urged demonstrators to meet today afternoon at five place across the city, including near the Grand Palace and the city's main international airport.
The page told protesters to "move quickly, take a picture (with the salute) and then disappear into the crowd" to avoid arrest.
In a televised address to the nation on Friday, Prayut warned Thais against using the salute.
"I beg you not to raise the three fingers. Why do you have to imitate them (foreigners)?" he said.
Prayut said he was forced to seize power after nearly seven months of anti-government protests which saw 28 people killed and hundreds of others wounded.
The army chief has said elections are not expected to be held for at least a year to allow vaguely-defined reforms leading to a new constitution to be drawn up in an effort to end a political crisis stretching back almost a decade.
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