Abstract: A method and a device for enhancing brightness and contrast of a video image are provided. In the method, an inflection point, a truncation point, a maximum value of a brightness component, and a minimum value of the brightness component of an image frame to be processed are determined based on the brightness component of the image frame to be processed, a piecewise linear function is determined based on the inflection point, and brightness and contrast enhancement processing is performed on the image frame to be processed based on the piecewise linear function. Compared with the brightness and contrast enhancement method in conventional art, the method and device of the application can achieve better brightness and contrast enhancement effects.

Abstract: A method and a device for enhancing brightness and contrast of a video image are provided. In the method, an inflection point, a truncation point, a maximum value of a brightness component, and a minimum value of the brightness component of an image frame to be processed are determined based on the brightness component of the image frame to be processed, a piecewise linear function is determined based on the inflection point, and brightness and contrast enhancement processing is performed on the image frame to be processed based on the piecewise linear function. Compared with the brightness and contrast enhancement method in conventional art, the method and device of the application can achieve better brightness and contrast enhancement effects.

Abstract: A matrix switcher is provided. A code rate of an ultra-high-definition video signal is reduced on the premise that the quality of the ultra-high-definition video signal is not affected through performing a Color Space Conversion (CSC) process and/or a Digital Stream Compression (DSC) process on the ultra-high-definition video signal at the transmitting side chip, thereby reducing a bandwidth required in conversion, switch and transmission of the ultra-high-definition video signal. A matrix switch chip with a low cost and general performance is used. Then, a corresponding DSC data decompression process and/or CSC process are performed at the receiving side to recover the performance of the ultra-high-definition video signal.

Abstract: A matrix switcher is provided. A code rate of an ultra-high-definition video signal is reduced on the premise that the quality of the ultra-high-definition video signal is not affected through performing a Color Space Conversion (CSC) process and/or a Digital Stream Compression (DSC) process on the ultra-high-definition video signal at the transmitting side chip, thereby reducing a bandwidth required in conversion, switch and transmission of the ultra-high-definition video signal. A matrix switch chip with a low cost and general performance is used. Then, a corresponding DSC data decompression process and/or CSC process are performed at the receiving side to recover the performance of the ultra-high-definition video signal.