Here's the article that cites it from 2016, on designing a mobile
   personal device to defend against video surveillance.
   [1]https://digitalworks.union.edu/theses/206/
   Detection and Depletion of Digital Cameras: An Exploration into
   Protecting Personal Privacy in the Modern World
   As all forms of technology become more integrated into our daily lives,
   personal privacy has become a major concern. Everyday devices, such as
   mobile phones, have surveillance capabilities simply by having a
   digital camera as part of the device. And while privacy and secrecy
   seem to go hand in hand, it is not always the case that one does not
   care about privacy because they have nothing to hide. For example,
   everything from unflattering photographs to being unknowingly and
   perhaps criminally surveilled, are ample reasons to desire some means
   of combatting the not so candid presence of digital cameras in everyday
   life. There is also the more casual argument of having control over
   one's public image. For these reasons, we propose a wearable device
   that offers personal privacy protection. This device should be able to
   detect for cameras in an area, and then disrupt the photographer's
   ability to capture their photo. In this project, we explored the
   implications of creating such a device, and evaluate which approaches
   to detection and disruption would be possible for such a device.

   On Thu, Jun 11, 2020, 9:39 AM Karl <[2]gmkarl@gmail.com> wrote:

   This is a public article from 2011 on electrojamming surveillance
   cameras.  I've heard people are doing this in the streets now.
   [3]https://ieeexplore.ieee.org/document/6105817

Digital camera sensing and its image disruption with controlled
radio-frequency reception/transmission

   Photography is becoming more and more end user capability, with many
   people having digital cameras on their mobile phones. In general
   digital cameras are phasing out traditional film based equipment. The
   advantages of digital photography include the compactness of the
   cameras, high reliability and ease of image processing and transmission
   of the images via the internet or multimedia messaging (MMS) enabling
   the photographer to send his images within seconds. These processes
   emphasize a big problem: the ability to photograph an object without
   the approval of its owner. This unsolved problem has many aspects: the
   right to privacy, paparazzi, industrial intelligence and the protection
   of objects having high security sensitivity. This paper describes test
   methodology and test results to sense and then to disrupt digital
   imaging camera by using a controlled Radio Frequency (RF) transmission.
   This method can be used in order to create a system for causing a
   localized malfunctioning of a digital camera in a specified area to
   degrade photographic recording done by the digital camera, comprising
   the steps of coupling the digital camera to a source of electromagnetic
   interference and generating electromagnetic waves in a specific
   frequency to interfere with the correct functioning of at least one
   electronic component of the digital camera.

References

   1. https://digitalworks.union.edu/theses/206/
   2. mailto:gmkarl@gmail.com
   3. https://ieeexplore.ieee.org/document/6105817