Back to results
US 4,974,078 AGranted
Digital compression method and system with improved coding efficiency
AssigneeEastman Kodak Company
InventorYusheng T. Tsai
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEastman Kodak Company
InventorYusheng T. Tsai
Estimating the term…
In a method for creating a scan sequence for a single chip color camera an analysis of typical images, captured through a color filter array, is performed to determine an optimal scan sequence for the particular array and/or the typical images. The images, after being digitally captured, are separated into red, green and a blue image databases and the color databases are processed separately. A Discrete Cosine Transform is performed on blocks of the image data and the average RMS values for the coefficients of the images are determined. The RMS values are sorted in descending order to produce a descending scan sequence that optimizes the performance of run length coding schemes. The scan sequence can be stored in a hardware, firmware or software lookup table as a list of block coordinates or indices and used by the camera system to convert two dimensional blocks of coefficients into one dimensional lists of coefficients suitable for run length coding. The block coefficients are used to convert the decoded coefficients into image blocks before presentation on a color CRT of before producing a color print. By incorporating the method into an image capture system an adaptive system which will optimize coding for different image environments and/or different color filter arrays suitable for the different environments is produced.
A method of producing a coefficient scan sequence for transform coefficients of an image to be encoded, said method comprising the steps of:
A method of producing a coefficient scan sequence for transform coefficients of an image to be encoded, said method comprising the steps of:
An image compression system using a color filter array, comprising:
An image compression system, comprising:
A method of compressing an image, comprising the steps of:
A scan sequence for transforming a two dimensional block of transform coefficients, produced using a camera with a color filter array having a pattern, into a one dimensional list of the transform coefficients, comprising:
A scan sequence for transforming a two dimensional block of transform coefficients, produced using a single chip camera, into a one dimensional list of the transform coefficients, comprising:
Dependencies are inferred from the claim text.