Camera module, image processing device and image compression method

An image processing device comprising:

• an interface configured to receive compressed data that is obtained by compressing image data comprising a plurality of pixel groups, in a unit of a pixel group;
• a memory storing the received compressed data;
• a decompressor configured to decompress at least a part of the stored compressed data to generate decompressed data;
• and
• an image signal processor configured to perform image processing, based on the generated decompressed data, to generate reconstructed image data including first image data having a first resolution and second image data having a second resolution,
• wherein the compressed data comprises first compressed data that is used to generate the first image data and the second image data, and second compressed data that is used to generate the second image data,
• wherein the interface is configured to:
• based on receiving a request for the first image data, request the first compressed data to a camera module and transmit the received first compressed data from the camera module to the memory;
• and
• based on receiving a request for the second image data, request the first compressed data and the second compressed data to the camera module and transmit the received first compressed data and the second compressed data from the camera module to the memory, and
• wherein the first compressed data is based on a calculated representative pixel value of each of the plurality of pixel groups, the representative pixel value being calculated based on pixel values of multiple pixels included in a corresponding pixel group such that a single representative pixel value is calculated for each of the plurality of pixel groups.

A camera module comprising:

• an image sensor configured to generate image data comprising a plurality of pixels;
• a first compressor configured to:
• divide the plurality of pixels included in the generated image data, into a plurality of first pixel groups;
• with respect to each of a plurality of first pixel groups into which the plurality of pixels is divided, calculate a first representative pixel value of a corresponding pixel group, based on pixel values of multiple pixels included in the corresponding pixel group;
• generate target image data, based on the calculated first representative pixel value of each of the plurality of first pixel groups;
• with respect to each of the plurality of first pixel groups, calculate first residual values representing differences between the pixel values of the multiple pixels included in the corresponding pixel group and the first representative pixel value of the corresponding pixel group;
• and
• generate first compressed data, based on the calculated first residual values of each of the plurality of first pixel groups;
• a second compressor configured to:
• receive the target image data and the first compressed data from the first compressor;
• and
• with respect to each of a plurality of second pixel groups generated by compressing each of the first pixel groups, generate second compressed data and third compressed data, based on the target image data;
• and
• an interface configured to output the generated first compressed data, the generated second compressed data, and the generated third compressed data.