Method validateBlockSize

pixelizer.js:416–437

(imageData, blockSize)

    }

    validateBlockSize(imageData, blockSize) {
        const { data, width, height } = imageData;
        let totalVariance = 0;
        let blockCount = 0;
        
        // 采样验证
        const sampleSize = Math.min(100, Math.floor((width * height) / (blockSize * blockSize)));
        
        for (let i = 0; i < sampleSize; i++) {
            const startX = Math.floor(Math.random() * (width - blockSize));
            const startY = Math.floor(Math.random() * (height - blockSize));
            
            const variance = this.calculateBlockVariance(data, width, startX, startY, blockSize);
            totalVariance += variance;
            blockCount++;
        }
        
        const averageVariance = totalVariance / blockCount;
        
        // 方差越小，置信度越高
        return Math.max(0, 1 - (averageVariance / 10000));
    }

    calculateBlockVariance(data, width, startX, startY, blockSize) {
        const pixels = [];