Patent ID: 6453072
Filing Date: 2002-09-17
Classification: H04N

Abstract:
An image coding system comprising an image pick-up unit for photoelectrically and then digital-to-analog converting image focused by an optical system, thereby providing digital image data, a color space/pixel number converting unit for converting the digital image data provided from the image pick-up unit to color space and pixel number converted digital image data to be stored and/or transmitted, an orthogonal converting unit for orthogonally converting the digital image data, a quantizing unit for quantizing orthogonal conversion coefficients provided from the orthogonal converting unit, a variable run length coding unit for variable run length coding the quantized orthogonal conversion coefficients from the quantizing unit, and a storing/transmitting unit for storing and/or transmitting the variable run length coded data from the variable run length coding unit, wherein:the image coding system further comprises a code volume control unit for providing, in a first coding process, image data obtained from the color space/pixel number converting unit as a result of omission of at least the color space conversion, among the color space and pixel number conversions, to the orthogonal converting unit, and computing quantizing coefficient data adequate for obtaining a target code volume from the code volume of coded data provided from the orthogonal converting unit and the target code volume; and in a second coding process executed from an instant of time after the first coding process, the color space/pixel number converting unit executes both of the color space and pixel number conversions and provides resultant image data to the orthogonal converting unit and stores and/or transmitting the coded data provided as a result from the orthogonal converting unit.