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Bit rate control method and device for image compression

A control method and a technology of a control device, which are applied to color televisions with bandwidth compression, image communications, televisions, etc., and can solve problems such as increasing the number of computing clocks and consuming computing resources

Inactive Publication Date: 2013-09-25
NOVATEK MICROELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In this way, at least two image compression operations are often required to obtain image files that meet the requirements, which increases the number of operating clocks and consumes computing resources.

Method used

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  • Bit rate control method and device for image compression
  • Bit rate control method and device for image compression

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Embodiment Construction

[0017] Please refer to figure 1 , which is a flowchart of a bit rate control method for image compression according to an embodiment of the present invention. Such as figure 1 As shown, SD represents the spatial domain image data of an image. In step S110, the image complexity (image complexity) of the spatial domain image data SD is obtained. In step S120 , for a color channel (or channel), a corresponding scale factor (eg, represented by SF_E) is estimated according to the image complexity obtained in step S110 and a target bit rate. As shown in step S130 , when image compression is performed, the frequency domain image data of the image is quantized according to the estimated scaling factor SF_E of each channel.

[0018] The bit rate control method of this embodiment can be applied to image compression methods that need to convert spatial domain image data into frequency domain image data, such as JPEG or MPEG data compression methods. The following example uses JPEG to...

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Abstract

The invention provides a bit rate control method and device for image compression. The bit rate control method comprises the following steps of: obtaining image complexity of a color passage in a space domain image data according to the space domain image data of an image; estimating a corresponding zoom coefficient for the color passage according to the image complexity and a target bit rate; and when performing the image compression on the image, quantizing the frequency domain image data of the image according to the estimated zoom coefficient corresponding to the color passage.

Description

technical field [0001] The present invention relates to an image compression method and device, and in particular to a bit rate control method and device for image compression. Background technique [0002] The general image compression coding method changes an original image into a coded and compressed stream, which can mainly consist of five parts, including sampling and color space conversion (Downsample & Color SpaceTransform), conversion (Transform), quantization (Quantization) ), coefficient prediction (Prediction) and entropy coding (Entropy Coding). Taking the JPEG standard as an example, it first converts the color to the YCbCr color space, then undergoes discrete cosine transform (DCT: Discrete Cosine Transform), quantization, and then performs prediction difference on the coefficient of the DC term, and finally scans the coefficient in a zigzag (Zig -Zag Scan) to scan into run-length encoding (Run-Length Encoding) in sequence, and then complete encoding with vari...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/30H04N11/02H04N19/124
Inventor 卢耕博林瑞伦
Owner NOVATEK MICROELECTRONICS CORP
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