When defining an adaptive template, valid range, weight, or confidence threshold can be defined for each operator and even for each operators output. Using those properties, when operators are evaluated, a confidence value is set for eachoperators output depending on the ability of the value output to fit in the valid range previously defined in the template. If the confidence value of an operator output is below its confidence threshold, the operator it belongs to will be set to invalid, except if the output was defined as non discriminatory. Likewise, if an operator is set to invalid or, if its confidence value does not reach the c onfidence threshold, the element it belongs to will be set to invalid except if the operator was defined as non discriminat ory.Template Candidate In order to evaluate a template matching hypothesis the ATM uses t emplates candidates. Those candidates inherit all their pr operties from their template. Using the known geometri c relations between elements inside each template, candidate elements and operators are evaluated hierarchically. Depending on the confidence value each element and operator returned, a candidate confidence value is computed. Yet, as soon as any discriminatory operator/operators outp ut/element is set to invalid during the evaluation process, the candidate is immediately rejected. Since some elem ents are not always visible, they can be set to non discrimi natory. Therefore, it could increase the confidence valu e in case a non discriminatory element is visible.In case of traffic light recognition , we defined three different templates; one for each state s uch as go, caution or stop. To represent a French traffic ligh t with the top-down approach, we use three different elem ents: a Spot element for the lamp, a Background element f or traffic light body, and a Rectangle for the pole. Since the pole can be hidden (because of vehicles, traffic signs, hang ing traffic light, etc), this element is set to non discriminato ry. Fig. 8 illustrates the geometry of the red traffic light tem plate while Fig. 9 is the representation of the operators used for this template.
When defining an adaptive template, valid range, weight, or confidence threshold can be defined for each operator and even for each operators output. Using those properties, when operators are evaluated, a confidence value is set for eachoperators output depending on the ability of the value output to fit in the valid range previously defined in the template. If the confidence value of an operator output is below its confidence threshold, the operator it belongs to will be set to invalid, except if the output was defined as non discriminatory. Likewise, if an operator is set to invalid or, if its confidence value does not reach the c onfidence threshold, the element it belongs to will be set to invalid except if the operator was defined as non discriminat ory.<br><br>Template Candidate In order to evaluate a template matching hypothesis the ATM uses t emplates candidates. Those candidates inherit all their pr operties from their template. Using the known geometri c relations between elements inside each template, candidate elements and operators are evaluated hierarchically. Depending on the confidence value each element and operator returned, a candidate confidence value is computed. Yet, as soon as any discriminatory operator/operators outp ut/element is set to invalid during the evaluation process, the candidate is immediately rejected. Since some elem ents are not always visible, they can be set to non discrimi natory. Therefore, it could increase the confidence valu e in case a non discriminatory element is visible.<br><br>In case of traffic light recognition , we defined three different templates; one for each state s uch as go, caution or stop. To represent a French traffic ligh t with the top-down approach, we use three different elem ents: a Spot element for the lamp, a Background element f or traffic light body, and a Rectangle for the pole. Since the pole can be hidden (because of vehicles, traffic signs, hang ing traffic light, etc), this element is set to non discriminato ry. Fig. 8 illustrates the geometry of the red traffic light tem plate while Fig. 9 is the representation of the operators used for this template.
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