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Shading correcting method and apparatus, and digital camera

A technology for correcting data and correcting lenses, applied in still cameras, image data processing, image data processing, etc., can solve the problems of time-consuming, increased circuit scale, and increased cost.

Inactive Publication Date: 2004-09-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, RAM has a larger circuit scale than ROM, so the circuit scale is smaller than that of ROM. Figure 8 the structure is bigger
In addition, at the time of startup, it is necessary to write the correction data to the RAM, and it takes time to start the device.
[0010] In addition, in Patent Document 1, a plurality of ROMs is provided to realize the light-shielding correction corresponding to the characteristics of the optical system, but since a plurality of ROMs storing a plurality of correction data are provided, the circuit scale is further increased, and the cost is also increased.

Method used

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  • Shading correcting method and apparatus, and digital camera
  • Shading correcting method and apparatus, and digital camera
  • Shading correcting method and apparatus, and digital camera

Examples

Experimental program
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Embodiment Construction

[0029] Embodiments of the present invention will be described below with reference to the drawings.

[0030] (Embodiment 1)

[0031] figure 1 It is a block diagram showing an example of the system configuration of the digital camera according to the present invention. figure 1 The illustrated digital camera 1 includes a lens 2, an imaging element (image sensor) 3, a DSP (Digital Signal Processor) 4 having shading correction blocks 10 and 10A, and an EEPROM (Electrically Erasable and Programmable ROM) 5 storing parameters for shading correction.

[0032] DSP 4 has SSG (Sync Signal Generator) 41 that generates synchronous signals, TG (Timing Generator) 42 that receives synchronous signals and supplies drive pulses to imaging element 3, and generates luminance signals (Y) based on the output of imaging element 3 that performs shading correction A YC generation unit 43 for the color signal (C), and a JPEG unit 44 for compressing the luminance and color signals output from the ...

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Abstract

From horizontal and vertical coordinate values HC and VC of a pixel, a distance operation unit calculates a distance value RV indicating the distance from an optical-axis position to the pixel. A correction-data operation unit receives the distance value RV, and calculates correction data CD for the pixel by referring to an approximation function indicating relation between distance values and correction data. The approximation function is divided into a plurality of segments, and in each segment represented by a quadratic function defined by a predetermined number of sample points.

Description

technical field [0001] The invention relates to a technique for correcting lens shading for image data captured by a camera. Background technique [0002] so-called lens shading such as Figure 7 As shown in (a), in the image captured by the optical lens, the central part is bright and the peripheral part is dark. The phenomenon is as Figure 7 As shown in (b), it occurs due to low light intensity around the imaging element. That is, since light is obliquely incident in the peripheral portion, the amount of incident light per unit pixel is smaller than that in the central portion, so that the image becomes dark. With the lens shielding, the output of the imaging element decreases in a concentric circle around the position of the optical axis. In addition, the light-shielding characteristics differ depending on the aperture value of the camera, the zoom position, the type of lens, and the like. [0003] Figure 8 It is a block diagram showing a configuration example of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04N1/401H04N23/76H04N101/00
CPCH04N5/3572H04N25/61
Inventor 川上诚岩泽高广猪熊一行津村敬一德山克巳中嶋俊幸
Owner PANASONIC CORP