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Image zooming method, device and chip
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An image scaling and zooming technology, which is applied in image data processing, graphics and image conversion, cathode ray tube indicators, etc., can solve problems such as consumption, large memory area, complexity, etc., to reduce cache area, reduce production cost, and reduce power consumption. consumption effect
Inactive Publication Date: 2009-09-02
VIMICRO CORP
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[0010] It can be seen that the existing scaling technology uses 6 lines of LBuf to store the temporary data after row scaling, which consumes a large memory area
Correspondingly, in the scaling device, the scaling control of the large memory requires a relatively complex scaling control circuit, which increases the power consumption of the system
Simultaneously, the cost of the complex scaling control circuit is also relatively high, therefore, adopting the scaling technology provided by the prior art further increases the production cost of the scaling device
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no. 1 example
[0071] The first embodiment: the above original image is reduced to an image with a size of 75 (15 rows×5 columns) pixels.
[0072] First, start the scaling process from the first row. When scaling the data in the first row, select the second, third, fourth, fifth, and sixth rows, and read the first column data in the first-sixth row data. The column data contains a total of 6 pixel values.
[0073] In the embodiment of the present invention, the above-mentioned lines 1-6 of the original image data are defined as the first block of data to be processed of the original image. Then, the above original image containing 300 pixel values can be divided into 5 pieces of data to be processed.
[0074] After scaling the first column of data by using a 6-order low-pass filter, the required 3 pixel values are extracted to obtain the first column of temporary pixel values, and the column of temporary pixel values includes 3 pixels. Read the first pixel of the temporary pixel valu...
no. 2 example
[0083] Second embodiment: the above-mentioned original image with a size of 300 (30 rows×10 columns) pixel values is enlarged to an image with a size of 1200 (60 rows×20 columns) pixels.
[0084] First, start the scaling process from the first row. When scaling the data in the first row, select the second, third, fourth, fifth, and sixth rows, and read the first column data in the first-sixth row data. The column data contains a total of 6 pixel values.
[0085] In the embodiment of the present invention, the above-mentioned lines 1-6 of the original image data are defined as the first block of data to be processed of the original image. Then, the above original image containing 300 pixel values can be divided into 5 pieces of data to be processed.
[0086] After the above-mentioned first column of data is scaled by using a 6-order low-pass filter, the required 12 pixel values are extracted to obtain the first column of temporary pixel values, and the column of temporar...
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Abstract
The invention provides an image zooming method, an image zooming device and an image zooming chip. The image zooming method comprises the steps: a current line which needs to be zoomed is selected; rows of data of the current line which needs to be zoomed are sequentially zoomed into a row of temporary pixel values; the first pixel value of the row of temporary pixel values is stored into a line of Lbuf; the pixel value in the line of Lbuf is zoomed to obtain destination data; the steps are repeated, and the destination data of each line is stored. According to the method, the invention also provides the image zooming device and the image zooming chip. The image zooming method, the image zooming device and the image zooming chip only use one line of Lbuf to zoom original images, thereby effectively reducing the cashe area of a system, further reducing the production cost of the chip and reducing the power consumption of the chip system.
Description
technical field [0001] The invention relates to the technical field of digital imageprocessing, in particular to an image scaling method, device and chip. Background technique [0002] With the rapid development of science and technology, high-tech products such as digital cameras, mobile phones with camera functions, DV cameras and mobile TVs have increasingly entered people's lives and work. At the same time, we often encounter the problem that the size of the image captured by the camera does not match the size of the final screen to be played. The above problems need to be solved by using image scaling technology. Image scaling technology is one of the common technologies in digital imageprocessing. Through image scaling technology, the same source image, that is, the source data of the collected image, can be used to generate targets with different resolutions. images, so that a screen image can be displayed on terminal devices with different resolutions. [0003] F...
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