hdmi / dsi 출력 설정에 무언가 영향을 줘서 DSI로 강제 설정되며 HDMI가 꺼지는것으로 추측.
display_default_lcd If a Raspberry Pi DSI LCD is detected it will be used as the default display and will show the framebuffer. Setting display_default_lcd=0 will ensure the LCD is not the default display, which usually implies the HDMI output will be the default. The LCD can still be used by choosing its display number from supported applications, for example, omxplayer.
The Raspberry Pi Touch Display is an LCD display which connects to the Raspberry Pi through the DSI connector. In some situations, it allows for the use of both the HDMI and LCD displays at the same time (this requires software support).
retinex 알고리즘은 어두운 사진에서 식별 가능하도록 보정해주는 거라고 하는데(CCTV 등?)
내용을 보면 그것과는 좀 다른 느낌?
Retinex improves visual rendering of an image when lighting conditions are not good. While our eye can see colors correctly when light is low, cameras and video cams can't manage this well. The MSRCR (MultiScale Retinex with Color Restoration) algorithm, which is at the root of the Retinex filter, is inspired by the eye biological mechanisms to adapt itself to these conditions. Retinex stands for Retina + cortex.