libopencv-viz-dev 4.6.0+dfsg-10 (riscv64 binary) in ubuntu lunar

 This package contains the header files and static library needed to compile
 applications that use OpenCV (Open Computer Vision) 3D data visualization
 library.
 .
 The Open Computer Vision Library is a collection of algorithms and sample
 code for various computer vision problems. The library is compatible with
 IPL (Intel's Image Processing Library) and, if available, can use IPP
 (Intel's Integrated Performance Primitives) for better performance.
 .
 OpenCV provides low level portable data types and operators, and a set
 of high level functionalities for video acquisition, image processing and
 analysis, structural analysis, motion analysis and object tracking, object
 recognition, camera calibration and 3D reconstruction.