Method and apparatus for performing block retrieval on block to be processed of urine sediment image

An apparatus for performing block retrieval on a first block to be processed of a urine sediment image, comprising:

• a block retrieval unit configured to use a plurality of decision trees to perform block retrieval on the first block to be processed of the urine sediment image, wherein each of the plurality of decision trees comprises a judgment node and a leaf node, and the judgment node judges the first block to be processed to make it reach the leaf node by using a block retrieval feature in a block retrieval feature set to form a block retrieval result at the leaf node, wherein the block retrieval result comprises an index corresponding to one or more second block stored in a database, the index to the second block belonging to the leaf node, and at least two decision trees in the plurality of decision trees are different in structures thereof and/or judgments performed by the judgment nodes thereof by using the block retrieval feature, the block retrieval unit configured to use the indexes of the block retrieval results to retrieve second blocks from the database whereby retrieved second block are included in the block retrieval results;
• and,
• an integration unit configured to integrate the block retrieval results of the plurality of decision trees so as to form a final block retrieval result;
• wherein the block retrieval unit and the integration unit include a processor and a memory storing an executable instruction.