An image analysis system which captures image data of an arbitrary pair of a first image and a second image among two or more images, the first and second image (RI, LI) consist of color pixels obtained by color-photographing a single photographing object from different photographing positions into an image analysis computer for analysis, wherein the image analysis computer comprises: corresponding point extraction means for assigning a weighing factor W Hn, W Ln to a pixel information value comprising a pixel color value based on a contrast size C n of the pixel information value describing characteristics of a pixel, wherein each pixel information value includes brightness values of a plurality of color components and indicates through its plurality of values characteristics of the respective individual pixel, wherein at least one arbitrary reference point and a first local area (R0I1) around said reference point is set in the first image; for each reference point corresponding second local areas (R0I2) of the same size as the first local area (R0I1) are set in the second image at positions at which scanning is performed on the second image; for each first and corresponding second local areas (R0I1, R0I2) a local contrast is computed, the local contrast expressing the size of local differences in pixel information values in the respective local area, wherein the contrast size C n of each pixel information value is calculated for each color component based on the maximum value and the minimum value of the component in the local area; the weighing factors W Hn, W Ln are assigned to the pixel information values of each first local area (R0I1) and its corresponding second local areas (R0I2), each weighing factor W Hn, W Ln being based on the local contrast computed for its respective area; a similarity is calculated between each first local area (R0I1) and its corresponding second local areas (R0I2), wherein the calculation is based on the pixel information values of the corresponding areas weighed by said weighing factors W Hn, W Ln a corresponding point which corresponds to the reference point is extracted from the second local area (R0I2) having highest similarity; and depth information of the photographing object is computed based on the coordinates of the first reference point and the second reference point; and the weighing factors W Hn, W Ln and the contrasts C n are computed independently for each color component such that the difference in information in image details of each color component is reflected by the weighing factors W Hn, W Ln, and wherein the contrast size C n is compared with the reference value T an independently for each color component, such that when the relation C n ≥ T an is satisfied, the weighing factor W Hn is assigned to the pixel information value, while the relation C n < T an is satisfied, the weighing factor W Ln is assigned to the pixel information value, the weighing factor W Hn being higher than the weighing factor W Ln. corresponding point extraction means for assigning a weighing factor W Hn, W Ln to a pixel information value comprising a pixel color value based on a contrast size C n of the pixel information value describing characteristics of a pixel, wherein each pixel information value includes brightness values of a plurality of color components and indicates through its plurality of values characteristics of the respective individual pixel, wherein at least one arbitrary reference point and a first local area (R0I1) around said reference point is set in the first image; for each reference point corresponding second local areas (R0I2) of the same size as the first local area (R0I1) are set in the second image at positions at which scanning is performed on the second image; for each first and corresponding second local areas (R0I1, R0I2) a local contrast is computed, the local contrast expressing the size of local differences in pixel information values in the respective local area, wherein the contrast size C n of each pixel information value is calculated for each color component based on the maximum value and the minimum value of the component in the local area; the weighing factors W Hn, W Ln are assigned to the pixel information values of each first local area (R0I1) and its corresponding second local areas (R0I2), each weighing factor W Hn, W Ln being based on the local contrast computed for its respective area; a similarity is calculated between each first local area (R0I1) and its corresponding second local areas (R0I2), wherein the calculation is based on the pixel information values of the corresponding areas weighed by said weighing factors W Hn, W Ln a corresponding point which corresponds to the reference point is extracted from the second local area (R0I2) having highest similarity; and depth information of the photographing object is computed based on the coordinates of the first reference point and the second reference point; and the weighing factors W Hn, W Ln and the contrasts C n are computed independently for each color component such that the difference in information in image details of each color component is reflected by the weighing factors W Hn, W Ln, and wherein the contrast size C n is compared with the reference value T an independently for each color component, such that when the relation C n ≥ T an is satisfied, the weighing factor W Hn is assigned to the pixel information value, while the relation C n < T an is satisfied, the weighing factor W Ln is assigned to the pixel information value, the weighing factor W Hn being higher than the weighing factor W Ln.