Touch positioning method, touch screen, touch system, and display

A touch screen, comprising at least two cameras, at least two light sources, a regression reflection bar and a processing module, the at least two cameras comprising a first camera and a second camera, characterized in that the processing module comprises:

• an image data obtaining unit for processing image collected by the first camera to obtain first image data, and processing image collected by the second camera to obtain second image data, wherein the first image data comprise one touch image block, and the second image data comprise at least two touch image blocks;
• a second image data processing unit for processing the second image data to obtain third image data, the third image data comprising image blocks of two suspected touch objects;
• a distance obtaining unit for obtaining a distance between the two suspected touch objects according to the first image data and the third image data;
• an actual touch object location information obtaining unit, which comprises a first judgment unit for judging whether the distance between the two suspected touch objects is larger than a preset threshold, a first actual touch object location information obtaining unit for merging, when the first judgment unit judges that the distance between the two suspected touch objects is less than or equal to the preset threshold, image blocks of two suspected touch objects in the third image data into an image block of one actual touch object to obtain new third image data, and obtaining location information of the actual touch object according to the first image data and the third new image data, and a second actual touch object location information obtaining unit for taking, when the first judgment unit judges that the distance between the two suspected touch objects is larger than the preset threshold, the two suspected touch objects as two actual touch objects and obtaining location information of the two actual touch objects.