Based　on　the　problems　of　insufficient　single　visualization　and　waste　of　communication　bandwidth　when　uploading　images　after　collecting　images　in　the　existing　downhole　TV　systems　in　the　field　of　geological　surveys,　a　method　is　proposed　to　remove　the　invalid　areas　of　the　collected　panoramic　images　of　the　inner　wall　of　the　borehole,　and　expand　and　correct　the　valid　areas　into　Method　for　the　plan　view　of　the　inner　wall　of　the　drilled　hole.　First,　use　the　Kirchhoff　circle　algorithm　to　detect　the　invalid　black　hole　information　area　in　the　panoramic　image　of　the　inner　wall　of　the　borehole,　and　remove　it　after　determining　the　limit;　secondly,　use　the　mathematical　method　of　polar　coordinates　to　delineate　the　ring　limit　of　the　effective　area　image　and　expand　it　into　a　Trapezoidal　diagram;　finally,　the　expanded　trapezoidal　image　is　stretched　at　four　corners　using　the　perspective　transformation　algorithm　to　restore　the　plan　view　of　the　inner　wall　of　the　borehole.　Compared　with　the　existing　borehole　optical　imaging　system,　the　present　invention　can　effectively　divide　the　effective　area　and　the　invalid　area　in　the　panoramic　view　of　the　inner　wall　of　the　borehole,　save　the　communication　bandwidth　when　uploading　the　image　of　the　inner　wall　of　the　borehole,　improve　the　collection　efficiency,　and　has　practical　application.　value.　©　2022　IEEE.