Topic: Kalman Filter Applications
get product details such as item name, quantity, and total of this invoice ocr document:

[{"text":"Visma","coords":[[20,732],[20,709],[30,709],[30,732]]},{"text":"Software","coords":[[20,707],[20,673],[29,673],[29,707]]},{"text":"AS","coords":[[20,671],[20,661],[29,661],[29,671]]},{"text":"-","coords":[[20,658],[20,655],[29,655],[29,658]]},{"text":"Visma","coords":[[20,653],[20,631],[29,631],[29,653]]},{"text":"Global","coords":[[20,628],[20,604],[29,604],[29,628]]},{"text":"(","coords":[[20,599],[20,596],[29,596],[29,599]]},{"text":"u1180013","coords":[[19,596],[19,559],[29,559],[29,596]]},{"text":")","coords":[[19,558],[19,555],[28,555],[28,558]]},{"text":"V","coords":[[114,88],[134,88],[134,104],[114,104]]},{"text":"VINHUSET","coords":[[75,126],[174,126],[174,138],[75,138]]},{"text":"Kundenr","coords":[[53,176],[102,176],[102,184],[53,184]]},{"text":":","coords":[[102,176],[105,176],[105,184],[102,184]]},{"text":"12118","coords":[[162,175],[192,175],[192,184],[162,184]]},{"text":"Delicatessen","coords":[[53,196],[138,196],[138,206],[53,206]]},{"text":"Fredrikstad","coords":[[144,196],[220,196],[220,206],[144,206]]},{"text":"AS","coords":[[224,196],[243,196],[243,206],[224,206]]},{"text":"Storgata","coords":[[53,219],[110,217],[110,231],[53,233]]},{"text":"11","coords":[[115,218],[130,218],[130,231],[115,231]]},{"text":"1607","coords":[[54,264],[87,264],[87,274],[54,274]]},{"text":"25","coords":[[53,543],[66,543],[66,551],[53,551]]},{"text":"FREDRIKSTAD","coords":[[134,263],[232,263],[232,274],[134,274]]},{"text":"Faktura","coords":[[51,330],[142,330],[142,347],[51,347]]},{"text":"Artikkelnr","coords":[[53,363],[107,363],[107,372],[53,372]]},{"text":"Artikkelnavn","coords":[[124,363],[191,363],[191,372],[124,372]]},{"text":"91480041","coords":[[53,389],[106,389],[106,399],[53,399]]},{"text":"Predicador","coords":[[126,389],[184,389],[184,399],[126,399]]},{"text":"75cl","coords":[[187,389],[209,389],[209,399],[187,399]]},{"text":"91480043","coords":[[53,414],[106,414],[106,424],[53,424]]},{"text":"Erre","coords":[[126,414],[148,414],[148,424],[126,424]]},{"text":"de","coords":[[152,414],[164,414],[164,424],[152,424]]},{"text":"Herrero","coords":[[169,414],[208,414],[208,424],[169,424]]},{"text":"91480072","coords":[[54,439],[106,440],[106,450],[54,449]]},{"text":"Deli","coords":[[126,440],[146,440],[146,449],[126,449]]},{"text":"Cava","coords":[[149,440],[177,440],[177,449],[149,449]]},{"text":"91480073","coords":[[54,467],[105,467],[105,475],[54,475]]},{"text":"Garmon","coords":[[126,465],[168,466],[168,475],[126,474]]},{"text":"60060221","coords":[[53,492],[106,492],[106,502],[53,502]]},{"text":"Jimenez","coords":[[125,492],[169,492],[169,502],[125,502]]},{"text":"-","coords":[[170,492],[173,492],[173,502],[170,502]]},{"text":"Landi","coords":[[175,492],[203,492],[203,502],[175,502]]},{"text":"El","coords":[[208,492],[218,492],[218,502],[208,502]]},{"text":"Corralon","coords":[[222,492],[268,492],[268,502],[222,502]]},{"text":"Delsammendrag","coords":[[64,516],[148,515],[148,526],[64,527]]},{"text":"Vin","coords"

Topic: Kalman Filter Applications
Could you write the kalman sequence filter for gnu octave?