fast_matchT_fast_matchFastMatchFastMatchfast_match (算子名称)

名称

fast_matchT_fast_matchFastMatchFastMatchfast_match — Searching all good matches of a template and an image.

警告

fast_matchfast_matchFastMatchFastMatchFastMatchfast_match is obsolete and is only provided for reasons of backward compatibility. New applications should use the shape-based or NCC-based operators instead.

参数签名

描述

该算子 fast_matchfast_matchFastMatchFastMatchFastMatchfast_match performs a matching of the template of TemplateIDTemplateIDTemplateIDTemplateIDtemplateIDtemplate_id and ImageImageImageImageimageimage. Hereby the template will be moved over the points of ImageImageImageImageimageimage so that the template always lies completely inside of ImageImageImageImageimageimage. The matching criterion (“displaced frame difference”) is defined as follows: The difference between fast_matchfast_matchFastMatchFastMatchFastMatchfast_match and exhaustive_matchexhaustive_matchExhaustiveMatchExhaustiveMatchExhaustiveMatchexhaustive_match is that the matching for one position is stopped if the error is too high. This leads to a reduced runtime but one might miss correct matches. The runtime of 该算子 depends mainly on the size of the domain of ImageImageImageImageimageimage. Therefore it is important to restrict the domain as far as possible, i.e. to apply 该算子 only in a very confined “region of interest”. The parameter MaxErrorMaxErrorMaxErrorMaxErrormaxErrormax_error determines the maximal error which the searched position is allowed to show. The lower this value is, the faster 该算子 runs.

All points which show a matching error smaller than MaxErrorMaxErrorMaxErrorMaxErrormaxErrormax_error will be returned in the output region MatchesMatchesMatchesMatchesmatchesmatches. This region can be used for further processing. For example by using a connection and best_matchbest_matchBestMatchBestMatchBestMatchbest_match to find all the matching objects. If no point has a match error below MaxErrorMaxErrorMaxErrorMaxErrormaxErrormax_error the empty region (i.e no points) is returned.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 在元组级别自动并行化。

参数表

结果

If the parameter values are correct, 该算子 fast_matchfast_matchFastMatchFastMatchFastMatchfast_match 返回值 2 ( H_MSG_TRUE) . If the input is empty (no input images are available) the behavior can be set via set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>). 如有必要，将引发异常。

可能的前置算子

create_templatecreate_templateCreateTemplateCreateTemplateCreateTemplatecreate_template, read_templateread_templateReadTemplateReadTemplateReadTemplateread_template, adapt_templateadapt_templateAdaptTemplateAdaptTemplateAdaptTemplateadapt_template, draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region, draw_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1, reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain

可能的后置算子

connectionconnectionConnectionConnectionConnectionconnection, best_matchbest_matchBestMatchBestMatchBestMatchbest_match

可替代算子

best_matchbest_matchBestMatchBestMatchBestMatchbest_match, best_match_mgbest_match_mgBestMatchMgBestMatchMgBestMatchMgbest_match_mg, fast_match_mgfast_match_mgFastMatchMgFastMatchMgFastMatchMgfast_match_mg, exhaustive_matchexhaustive_matchExhaustiveMatchExhaustiveMatchExhaustiveMatchexhaustive_match, exhaustive_match_mgexhaustive_match_mgExhaustiveMatchMgExhaustiveMatchMgExhaustiveMatchMgexhaustive_match_mg

模块

Matching

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