Fixed length code (FLC)-based image compression method and device are provided. The FLC-based image compression method for compressing a block containing multiple pixels includes the following steps: determining a first representative pixel and a second representative pixel from the pixels according to the pixel values of the pixels; generating, by interpolation, multiple interpolated pixels according to the first representative pixel and the second representative pixel; generating an index value for each of the pixels according to the first representative pixel, the second representative pixel, and the interpolated pixels; adjusting the first representative pixel and the second representative pixel to generate a first adjusted representative pixel and a second adjusted representative pixel; and using the index values and complete or quantized pixel values of the first adjusted representative pixel and the second adjusted representative pixel to represent the block.

The invention relates to a raw image encoder for encoding a raw image of a predetermined color pattern according to which the raw image is partitioned into pixel cell blocks, each pixel cell block comprising four pixels, each pixel being associated with one of three base colors so that each pixel cell block comprises, for each of the three base colors, at least one pixel, the raw image encoder configured to subject the raw image to a color transformation to obtain a color image, by mapping, for each pixel cell block, the four pixels of the pixel cell block onto a color component quadruple forming a sample of the color image, the color component quadruple comprising three color component values of a target color space, and one pseudo color component value, and subject the color image to a multi-component picture encoding to obtain a compressed data stream.

Techniques for selecting a luminance value for color space conversion are disclosed. Techniques include determining values for Cb and Cr from values for R, G, and B; producing a reconstructed Cb* value and a reconstructed Cr* value by processing the Cb and Cr values; and determining a plurality of Y value options from the values for Cb* and Cr*. A Y output value may be selected based on the plurality of Y value options.

A method includes obtaining, from an image sensor of a vehicle, an image signal that represents a vector of a plurality of input measured color values; determining weighting values as a function of the input measured values using a determination rule; ascertaining model matrices from a plurality of stored model matrices as a function of the weighting values, each of the model matrices generated for possible input measured values using a training rule; generating a color reconstruction matrix using the ascertained model matrices and at least one of the determined weighting values according to a generating rule; and applying the generated color reconstruction matrix to the measured color value vector in order to produce an output color vector that represents a processed image signal.

Systems and methods for analyzing printed images are provided. One system includes a processing circuit configured to: determine a set of one or more locations on the printed image on the substrate to measure color values; determine a set of input tone values for the at least one ink; receive a set of measured color values corresponding to the set of locations on the printed image from a sensor; and determine a tone value increase error based on the set of measured color values and the set of input tone values. The at least one processing circuit is configured to determine the tone value increase error without requiring measured color values from an area having solid ink.

A printing system is disclosed. The printing system includes a color management unit including one or more color caches to store input colors and corresponding output colors and a color engine (CE) to receive the input colors and perform Force-X transformations to map an input color into an output color based on a pre-defined color parameter.

The present disclosure discloses a method and an apparatus for processing image signal conversion. In one example method, an input primary color signal is obtained. The primary color signal is a numeric value of an optical signal corresponding to an image. The primary color signal is proportional to light intensity. Conversion processing is performed on the primary color signal to obtain processed image information. The image information is a numeric expression value of the image. The conversion processing includes at least the following processing: $L^{}={a\left(\frac{\mathrm{pL}}{\left(p-1\right)L+1}\right)}^m+b,$
where a, b, m, and p are rational numbers, L is the input primary color signal, and L is the processed image information.

Fixed length code (FLC)-based image compression method and device are provided. The FLC-based image compression method for compressing a block containing multiple pixels includes the following steps: determining a first representative pixel and a second representative pixel from the pixels according to the pixel values of the pixels; generating, by interpolation, multiple interpolated pixels according to the first representative pixel and the second representative pixel; generating an index value for each of the pixels according to the first representative pixel, the second representative pixel, and the interpolated pixels; adjusting the first representative pixel and the second representative pixel to generate a first adjusted representative pixel and a second adjusted representative pixel; and using the index values and complete or quantized pixel values of the first adjusted representative pixel and the second adjusted representative pixel to represent the block.

The invention provides methods that improve image compression and/or quality within the JPEG process by using a low-pass filter to remove high frequency components from image data, which removes blocking artifacts. Preferred embodiments apply the low-pass filter to the Chroma components after decompression prior to conversion into RGB color space.

A fixed length code (FLC)-based image compression method and a device thereof. The method is utilized to compress a block containing plural pixels and includes the following steps: determining a first representative pixel, a second representative pixel and a third representative pixel from the pixels according to pixel values of the pixels, the three representative pixels being noncollinear in a color space to which the pixels correspond; generating plural first interpolated pixels by interpolation according to the first representative pixel and the third representative pixel; generating plural second interpolated pixels by interpolation according to the second representative pixel and the third representative pixel; and generating an index value for each pixel according to the three representative pixels, the first interpolated pixels and the second interpolated pixels.