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Color Averaging Circuit in RGB Space

IP.com Disclosure Number: IPCOM000034317D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 3 page(s) / 71K

Publishing Venue

IBM

Related People

Edgar, A: AUTHOR [+3]

Abstract

An arrangement is described for performing real-time mixing of two digital color images stored in compressed RGB format. Fig. 1 is a block diagram of an image color mixing system capable of mixing two color images. Image pels a and b are shown as inputs to the system. These two inputs are the two different images to be mixed which are represented in an RBG compressed form described later. Block 1 in Fig. 1 is composed of three decompression circuits. Each decompression circuit decompresses one of the three RBG digital values for the incoming compressed image pel a. Block 2 decompresses the second image (pel b). The outputs of Blocks 1 and 2 drive Block 3. Block 3 consists of 3 identical mixing circuits which are detailed in Fig. 2.

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Color Averaging Circuit in RGB Space

An arrangement is described for performing real-time mixing of two digital color images stored in compressed RGB format. Fig. 1 is a block diagram of an image color mixing system capable of mixing two color images. Image pels a and b are shown as inputs to the system. These two inputs are the two different images to be mixed which are represented in an RBG compressed form described later. Block 1 in Fig. 1 is composed of three decompression circuits. Each decompression circuit decompresses one of the three RBG digital values for the incoming compressed image pel a. Block 2 decompresses the second image (pel
b). The outputs of Blocks 1 and 2 drive Block 3. Block 3 consists of 3 identical mixing circuits which are detailed in Fig. 2. The MR (mixing ratio) inputs adjust the ratios of pel a to pel b as shown in the equation in Fig. 2 (i.e., if MR is equal to 1, then the Z output is equal to the X input and, if MR is equal to 0, then Z output is equal to the Y input and, if MR is equal to .25, then 25 percent of the X input is added to the 75 percent of the Y input to formulate the output).

(Image Omitted)

In Fig. 1 the outputs from Block 3 represent the three uncompressed RGB colors (UR,UG,UB) for the mixed output pel created by the two compressed input pels (a and b). The MR input controls the amount of contribution of the input pels to the output pel. This circuit provides a means by which two digital color images are mixed. The circuit provides a linear mixing of color with respect to the illumination received by a came...