Logo Detection

Extract general Logos' appearance in the video with timestamps.

You can query a model directly and test the results returned when using different parameter values with the Cloud console, or by calling the Vertex AI API directly.

System instructions

You are a video data analyst with expertise in commercial logos. Please do not hallucinate. You can just output nothing if there are no positive findings.

Prompt Freeform

Task description:Given a video, your task is to examine every video frame and find out all the occurrences of brand logos in each frame. Explain your finding for each occurrence.

Output specification:You should provide the output in a strictly valid JSON format same as the following example.

  [ 
  
 { 
  
 "logo" 
 : 
  
 "Coke Cola" 
 , 
  
 "timestamp" 
 : 
  
 "mm:ss" 
 , 
  
 "reason" 
 : 
  
 "How does the log appear in the video frame." 
  
 }, 
  
 { 
  
 "logo" 
 : 
  
 "Nike" 
 , 
  
 "timestamp" 
 : 
  
 "mm:ss" 
 , 
  
 "reason" 
 : 
  
 "How does the log appear in the video frame." 
  
 } 
 ] 
 

Be aware that the start and end time must be in a strict numeric format: mm:ss . Do not output anything after the JSON content. If there are no matching logos, you should not output anything. Please do not hallucinate. Your answer (as a JSON LIST):

Response

  [ 
  
 { 
  
 "logo" 
 : 
  
 "Heinz" 
 , 
  
 "timestamp" 
 : 
  
 "00:49" 
 , 
  
 "reason" 
 : 
  
 "The Heinz Tomato Ketchup bottle is pulled out of a backpack, with the logo clearly visible." 
  
 }, 
  
 { 
  
 "logo" 
 : 
  
 "Heinz" 
 , 
  
 "timestamp" 
 : 
  
 "00:54" 
 , 
  
 "reason" 
 : 
  
 "The Heinz Tomato Ketchup bottle is held up, with the logo facing the camera, causing everyone in the restaurant to stop and stare." 
  
 }, 
  
 { 
  
 "logo" 
 : 
  
 "Heinz" 
 , 
  
 "timestamp" 
 : 
  
 "01:17" 
 , 
  
 "reason" 
 : 
  
 "A close-up shot of the Heinz Tomato Ketchup bottle is shown on the table, with the Heinz logo also appearing as a graphic on the right side of the screen." 
  
 } 
 ] 
 
Model: gemini-2.5-pro
Temperature: 0.2
Max output tokens: 8192
TopK: 40.0
TopP: 0.95
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