http://sci-hub.tw/10.1111/j.1745-9125.2011.00255.x
And this is the survey data on white perception of crime:
“When you think about people who break into homes and businesses, approximately what percent would you say are Black?”
40.4% Mean Perceived
31.7% Actual
“When you think about people who rob other people at gunpoint, approximately what percent would you say are Black?”
43.4% Mean Perceived
42.0% Actual
“When you think about people who sell illegal drugs, approximately what percent would you say are Black?”
40.2% Mean Perceived
33.6% Actual
“When you think just about juveniles who commit crimes, approximately what percent would you say are Black?”
40.8% Mean Perceived
31.3% Actual
Given that blacks are about 12% of the US population, these numbers show both that blacks commit a disproportionately large percentage of crimes, and that whites slightly over perceive this. It might be more valuable for blacks to focus on ways to lower the actual crime rate than the perceived crime rate.