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Improve Brand Detection Quality

I am trying to detect brands in pictures but I'm having some problems.

I did the cascade training with 500 positives samples and 1440 negatives samples, but I'm getting a lot of bad results. The cascade classifier detects the brand and further a lot of things that isn't the brand.

My question is: How do I eliminate the bad results and just stay with the brand that I am looking for ?

Improve Brand Detection Quality

I am trying to detect brands in pictures but I'm having some problems.

I did the cascade training with 500 positives samples and 1440 negatives samples, but I'm getting a lot of bad results. The cascade classifier detects the brand and further a lot of things that isn't the brand.

EDIT:

I tried to use SURF features to eliminate these bad results and look that it isn't work:

image description

The same result occured with a image that is not my brand:

image description

Look the detections:

image description

My question is: How do I eliminate the bad results and just stay with the brand that I am looking for ? What I'm doing wrong ?