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Constraints provided by observed pixel colors , highlight color analysis and illumination color uniformity are employed in our method to improve estimation of the underlying diffuse color .
 Constraints, method; pixel colors, highlight color analysis; highlight color analysis, illumination color uniformity; method, estimation of the underlying diffuse color
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 Constraints, method; pixel colors, highlight color analysis; highlight color analysis, illumination color uniformity; method, estimation of the underlying diffuse color