Generating alerts based upon detector outputs

A method system comprising:

• a client device comprising one or more processors;
• the client device coupled, via electronic communications, to a server computer comprising one or more processors, the server computer configured to receive, from a video source, video data comprising a plurality of frames;
• the client device configured to:
• receive, by the one or more processors of the client device, previously determined detector output data corresponding to the video data, wherein the previously determined detector output data comprises textual data corresponding to images of text detected in corresponding regions of the plurality of frames;
• determine, by the one or more processors of the client device, a monitoring region in the plurality of frames, wherein the monitoring region comprises at least one of the regions in the plurality of frames, by associating the at least one of the regions in the plurality of frames with a key item comprising a particular pixel pattern;
• define, by the one or more processors of the client device, a text string;
• and
• for each frame in the plurality of frames:
• determine, by the one or more processors of the client device, the textual data from the previously determined detector output data for the monitoring region;
• compare, by the one or more processors of the client device, the textual data with the text string;
• determine, by the one or more processors of the client device, a match based on the comparing;
• and
• perform, by the one or more processors of the client device, one or more actions in response to the match.