Patent
Frame skip encoding apparatus for moving images
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TLDR
In this article, an orthogonally transformed transformation signal is quantized into a linear or nonlinear discrete level on the basis of a step width of quantization from a step size controller 600 in a quantizer.Abstract:
In a moving image encoding apparatus, an image signal is converted into a digital image signal by an A/D converter and is stored in frame memory 110 In addition, a movement vector detector 300 detects a movement of the output of the frame memory 110 In an orthogonal transformer 130, a difference signal between a present frame image which is stored in the frame memory 110 and a previous frame image which is stored in a variable delay frame memory 210 is supplied, in which the difference signal is converted by orthogonal transformation The orthogonally transformed transformation signal is quantized into a linear or nonlinear discrete level on the basis of a step width of quantization from a step size controller 600 in a quantizer 140 Then, the quantized data is encoded into a variable length code in a variable length encoder 150 A movement vector detector 300 detects movement of the image by pattern matching processing between the present frame and the previous frame A movement vector/encoding mode judger 310 generates the movement vector 3 and the encoding mode 4 The variable length code is transmitted to the transmission circuit after adding a movement vector 3 and encoding mode 4 In these operations, a frame rate controller 700 controls the processing rate of each frame image in the entire apparatus Frame rate controller 700 calculates a total frame skip number S T which corresponds to the total number of frames that are not transmitted after a frame has been transmitted The total frame skip number S T is calculated by selecting a smaller sum of an externally set signal S min , signal S M which is calculated from the degree of movement compensation and S S which is calculated from the degree of quantization, and an externally set signal S max read more
Citations
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TL;DR: In this paper, the motion compensation of an input image Gi is executed in reference to the local decoded image Gk stored by STFM 11 and LTFM 13, respectively.
References
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Patent
Spatio-temporal sub-sampling of digital video signals representing a succession of interlaced or sequential images, transmission of high-definition television images, and emission and reception stages for such a system
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