IMAGE PROCESSING DEVICE AND MOVING IMAGE TRANSMISSION METHOD

摘要

Provided is an image processing device which performs scaling and applies super-resolution in accordance with the complexity of the image. On the compression side, a complexity calculation unit calculates the transmission image complexity, which indicates the complexity of the input image, multiplexes and outputs it to an encoded stream, and a control unit configures the cutoff frequency of a low pass filter and the scaling coefficient of an image reduction unit in accordance with the transmission image complexity. On the decompression side, a complexity calculation unit calculates the decoded image complexity indicating the complexity of a decoded and expanded image, a complexity comparison unit compares the transmission image complexity and the decoded image complexity and outputs the difference or ratio, and, on the basis of output, a parameter calculation unit optimizes and configures the scaling coefficient of an image enlargement unit and the folding frequency of a super-resolution processing unit.

主权项

1. An image processing device comprising an image compression unit for compressing an input image, and an image decompression unit for decompressing the compressed image for output,
wherein the image compression unit includes:
a low pass filter configured to limit a bandwidth of an input image signal based on a preset cutoff frequency;an image reduction unit configured to reduce an output signal from the low pass filter according to a preset reduction factor;an encoding unit configured to encode an output signal from the image reduction unit;a first complexity calculation unit configured to calculate at least one first parameter indicating image complexity for the input image signal;a control unit configured to set an optimal reduction factor in the image reduction unit while setting an optimal cutoff frequency in the low pass filter, based on the first parameter; anda multiplexer configured to multiplex the first parameter and an encoded stream outputted from the encoding unit for output, and wherein the image decompression unit includes:
a demultiplexer configured to extract the encoded stream and the first parameter from an input signal;a decoding unit configured to decode the encoded stream;an image enlargement unit configured to enlarge an output signal from the decoding unit according to a specified enlargement factor;a super-resolution processing unit configured to perform a super-resolution process on the enlarged image using a specified folding frequency;a second complexity calculation unit configured to calculate at least one second parameter indicating image complexity for the enlarged image;a complexity comparison unit configured to calculate a difference or a ratio between the first parameter and the second parameter; anda parameter calculation unit configured to set an optimal folding frequency in the super-resolution processing unit while setting an optimal enlargement factor in the image enlargement unit, based on the difference or the ratio.