Method for coding digital images utilizing a specific code for shortening the coding times

摘要

The method for coding digital images comprises the steps of initialization, coding and cleaning. The coding step comprises the steps of selection, the code computing and renormalization. The renormalization step comprises in particular a step of code output further comprising the steps of incrementing a pile in the case where the value of generated code is 0xFF as far as the code value is different from 0xFF, when the counter has a value of n; of writing, in buffer memory a corresponding code to n times a symbol determined when the code value is different from OxFF; and of decrementing the pile. The writing step consists of writing in an output memory a specific code which is not utilized for other functions, composed of a specific marker corresponding to a symbol to repeat and the number of repetitions of the symbol. The method defines three specific markers for coding 0x00000000, 0xFF00FF00, and 0x00FF00FF. The specific code is of length two times 16 bits, where 16 bits are for the specific marker, and further 16 bits are for the number of repetitions. The method for interpreting a coded image is by reading the output memory allowing to generate a standard code on the basis of a code comprising specific markers, and implies the generation of a symbol corresponding to the number of times specified by the number of repetitions. The reading of the first marker implies the generation of the symbol 0xFF00FF00 the number of times indicated by the second part of the specific code, the reading of the second marker implies the generation of the symbol 0x00000000. The method comprises an interpretation step preliminary to the decoding of the digital image.